String compression java geeksforgeeks. decompress(string) Return : Return decompressed string.

String compression java geeksforgeeks StringUtils is a utility class that provides a wide range of String manipulation methods that are not available in the standard Java String class. Dec 12, 2015 · As loop will end after reaching at end of string, so to handle last char compression, you have to save its count in list outside the body of loop. If you are not aware of it, use Basic Type Base64 Encoding and Jul 19, 2023 · LeetCode # 443: String Compression — Python Solution Introduction: We are going to explore a common solution for this “String Compression” problem. Apr 11, 2025 · In Java, the substring () method of the String class returns a substring from the given string. Mar 6, 2020 · With the help of zlib. String class provides many built-in methods for text manipulation. By using ZIP API in java we can zip and unzip into standards ZIP and GZIP formats. It is also used as the basis for other types of compression filters, such as GZIPOutputStream. length() is less than 20), but the compressed result is longer than the original string. Many String Problems can Sep 12, 2023 · This class is used to represent a ZIP file entry. util. decompress(s) method, we can decompress the compressed bytes of string into original string by using zlib. Methods: Object clone () : Returns a copy of this entry. As always we will be discussing constructors than moving onto methods furthermore implementing Jul 1, 2018 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. It is useful for validating input patterns and searching within strings. Oct 2, 2025 · A String Array in Java is an array that stores string values. For example, lowercase English alphabet has only 26 characters. Properties of Trie: It's a multi-way tree. The entire process ensures that for any key, we get an integer position within the size Sep 2, 2025 · Sliding Window Technique is a method used to solve problems that involve subarray or substring or window. May 2, 2024 · Embark on a journey through string manipulation and algorithmic analysis with this insightful guide from GeeksforGeeks. In JavaScript, there is no character type (Similar to Python and different from C, C++ and Java), so a single character string is used when we need a character. String Apr 28, 2025 · Understanding the characteristics and capabilities of strings in Java is essential for effective string manipulation and developing robust Java applications. They build the foundation for any type of calculation or logic in programming. lang. false if any of the characters are not matched. C++ includes the std::string class that is used to represent strings. It assigns variable-length codes to input characters, with shorter codes assigned to more frequent characters. Jul 23, 2025 · Huffman coding is a lossless data compression algorithm. js applications. In this article, we will learn the concepts of String Arrays in Java including declaration, initialization, iteration, searching, sorting, and converting a String Array to a single string. May 18, 2012 · I need to create a method that receives a String and also returns a String. It returns NullPointerException if any one of the strings is Null. In this article, we will explore simple ways to optimize string creation in Java. This method is useful for encoding the strings into binary format, which can then be used for file I/O, network transmission, or encryption. Nov 12, 2025 · In Java, a String is the type of object that can store a sequence of characters enclosed by double quotes and every character is stored in 16 bits, i. compress(string) Return : Return compressed string. Oct 9, 2023 · Unlock the secrets of java's string compression: Dive into java's unique methods for optimizing strings with our expert guide! Oct 31, 2025 · Given a string and a target substring, the task is to replace all occurrences of the target substring with a new substring. Sep 6, 2010 · I use GZIPOutputStream or ZIPOutputStream to compress a String (my string. Compress the string when lower and upper cases are the same. Aug 3, 2022 · String is an important topic from GATE exam point of view. In this illuminating article, you'll explore the task of determining if two given strings are isomorphic to each other—an essential problem in string processing with applications in cryptography, data compression, and algorithmic design. However, decoding the bitstream generated using this technique is inefficient. (say "k") Using these two, the character can be easily accessed using the below syntax: char ch = s[k]; OR char ch = s. Strings are immutable, so their values cannot be changed once created. The Huffman coding guarantees an optimal prefix-free encoding minimizing the total number of bits Jul 23, 2025 · Lossy compression methods include DCT (Discrete Cosine Transform), Vector Quantisation, and Transform Coding while Lossless compression methods include RLE (Run Length Encoding), string-table compression, LZW (Lempel Ziff Welch), and zlib. Examples: Input: str = "3 (ab)4 (cd)" Output: abababcdcdcdcd Input: str = "2 (kl)3 (ap)" Output: klklapapap Approach: We traverse through the string and wait for a numeric value, num to turn up LeetCode Solutions in C++23, Java, Python, MySQL, and TypeScript. Accessing characters by index in a string. The encoding rule is: k[encoded_string], where the encoded_string inside the square brackets is being repeated exactly k times. parseDouble (str); Example: Java Program to Convert String to Double Using parseDouble () Method. 1. The MessageDigest class provides the following cryptographic hash functions: MD2 MD5 SHA-1 SHA-224 SHA-256 SHA-384 SHA-512 These algorithms are initialized in static method called Dec 29, 2021 · Given string str of size N containing only lowercase English letters. Jul 12, 2025 · Given a string str consisting of lowercase and uppercase characters, the task is to find the minimum possible length the string can be reduced to after performing the given operation any number of times. It is one of the most commonly used data types in the Java programming language. Constructors ZipEntry (String name) : Creates a new zip entry with the specified name. java file and refer to the following code. In-depth solution and explanation for LeetCode 443. The entire process ensures that for any key, we get an integer position within the size Mar 6, 2020 · With the help of zlib. This is the most efficient and concise method. Like Java and Python, strings in JavaScript are immutable 1. A special compression mechanism can arbitrarily delete 0 or more characters and replace them with the deleted character count. We will use the hash code generated by JVM in our hash function and compress the hash code we modulo (%) the hash code by the size of the hash table. Data compression reduces the number of resources required to store and transmit data. In this article, we will learn how to remove all white spaces from a string in Java. Oct 27, 2025 · A HashMap is a part of Java’s Collection Framework and implements the Map interface. Jul 18, 2024 · Cryptographic Hash Functions in Java To calculate cryptographic hash values in Java, the MessageDigest class is used, which is part of the java. It returns the combined string. Jul 23, 2025 · Palindrome String Properties of a Palindrome String: A palindrome string has some properties which are mentioned below: A palindrome string has a symmetric structure which means that the character in the first half of the string are the same as in the rear half but in reverse order. Comments are added inside the code to understand the code in more detail. ASCII has only 256 characters. Prerequisite: Before proceeding with this application you should be aware of Base64 in java. How do you create a string in JavaScript? You create a string by putting text inside single Aug 14, 2025 · What is the Burrows-Wheeler Transform? The BWT is a data transformation algorithm that restructures data in such a way that the transformed message is more compressible. The main purpose of the compact string is whenever we create a string object and the characters inside the object can be represented using 1 byte, which is nothing but LATIN-1 representation, then internally java will create one byte []. String Compression in Python, Java, C++ and more. You are given the string S . Note: If two strings are equal, their hash values should also be equal. Using a For Loop The for loop is the most basic and manual approach. Jul 26, 2025 · In Java, String constructors are used to create new String objects from different sources like character arrays, byte arrays, or another string. Sep 20, 2025 · The string concat () method concatenates (appends) a string to the end of another string. Syntax: double d = Double. Jul 23, 2025 · Here, we are going to make an application of the “Encoding-Decoding” of an image. Apr 28, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. For example: After string compression, the string “aaaabbcddddd” would return “a4b2c1d5”. Encoding the data using this technique is very easy and efficient. Contribute to MAZHARMIK/Interview_DS_Algo development by creating an account on GitHub. Otherwise, append the character followed by the group's length. zip is used to compress the input data and fill the given buffer with the compressed data. It is useful in areas like text search, data analysis and more. format () method allows us to create a formatted string using a specified format string and arguments. It stores elements in key-value pairs, where, Keys are unique. There Exist several compression Algorithms, but we are concentrating on LZW. Zip and unzip are very important operations while writing application programs. The string should be compressed such that consecutive duplicates of characters are replaced with the character and followed by the number of consecutive duplicates. Syntax : zlib. FileInputStream, FileOutputStream and GZIPOutputStream classes are provided in Java to compress and decompress the files. Jul 15, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. Although strings in Java are usually created using string literals, the String class also provides constructors for more control. java. Instead of repeatedly iterating over the same elements, the sliding window maintains a range (or “window”) that moves step-by-step through the data, updating results incrementally. It can be done in two ways- lossless compression and lossy compression. Jan 30, 2024 · Understand what is a string compression leetcode problem and ho to solve it with implementation in C++, Java, and Python. On some site, I found some friend All String Methods The String class has a set of built-in methods that you can use on strings. It compares the value's character by character, irrespective of whether two strings are stored in the same memory location. Sep 11, 2023 · DeflaterOutputStream and InflaterInputStream classes are provided in Java to compress and decompress the file contents. js The zlib module helps developers compress and decompress data streams or buffers using different compression methods. The least frequent character gets the largest code and the most frequent one gets the smallest code. Jul 23, 2025 · The zlib module in Node. Decoders (or Jul 23, 2025 · Strings are essential data structures used to represent sequences of characters and are frequently encountered in coding interviews. Key Features of The StringUtils Class Null-safe methods: Many of the methods in the Jul 11, 2025 · String in Java are immutable sequences of characters. It provides complete control over the reversal process without Nov 20, 2024 · In Java, the matches() method in the String class checks if a string matches a specified regular expression. . Oct 14, 2025 · In Java, reversing a string means rearranging its characters from last to first. Nov 12, 2025 · Example: String str = new String (“GeeksforGeeks”); Interfaces and Classes in Strings in Java CharSequence Interface CharSequence Interface is used for representing the sequence of Characters in Java. The string can be compressed in the following way: If S = "ABCDABCD", then the string can be compressed as (ABCD)2, so the length of the compressed string will be 4. The idea behind a rolling hash is to compute the hash value for a fixed-size Aug 21, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. eg if the input string is “wwwwaaadexxxxxx”, then the function should return “w4a3d1e1x6&P Can you solve this real interview question? Decode String - Given an encoded string, return its decoded string. Commonly You are given the string S . Syntax : public Object clone() Overrides: clone in class Object Returns: a clone of this instance. Nov 29, 2024 · In Java, the getBytes () method of the String class converts a string into an array of bytes. Understanding key algorithms like pattern matching and edit distance is crucial. FilterInputStream java. format () method is a simple way to pad strings with spaces. The main idea is to use the results of previous window to do computations for the next window. Below is the code for the MainActivity. In the given C++ implementation, the time complexity is dominated by the creation of the Huffman tree using the priority queue, which takes O (n log n) time. zip package provides classes compress and decompress the file contents. It is commonly used in computer science and computational biology, where it can be used to detect approximate string matches, find repeated substrings, and perform other operations on sequences of data. Given two strings, S and T where S is a normal string and T is a compressed string, determine if the compressed string T is valid for the plaintext string S. Jul 23, 2025 · A string is referred to as an array of characters. Jun 24, 2019 · The deflate () function of the Deflater class in java. Given two strings, S and T where S is a normal string and T is a compressed string, determin Jun 27, 2024 · The Huffman coding is a popular algorithm used for lossless data compression. Sep 12, 2023 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. There are several ways to reverse a string in Java, from using loops to built-in methods. js is used for compressing and decompressing data. Apr 18, 2022 · The Java GZIPInputStream class (java. We have given an array of chars, and we Jul 23, 2025 · Step 5: Working with java files Go to the MainActivity. If the "compressed" string would not become smaller than the original string, your method should return the original string. Decoders (or Aug 8, 2025 · Compress Trie is obtained from standard trie by joining chains of single nodes. Examples: Input: s = "aaaaabbbbbb" Output: ab Explanation: Remove consecutive duplicate characters from a string s such as 5 a's are at consecative so only write a and same like that in b's condition. Example: We will use the replaceAll () method with the regex pattern "\\s" to remove all whitespaces from a string. The maximum number of children in a node is equal to the size of the alphabet. compress(s) method. First, create a Java text file and save it using a name. It is used for string concatenation in Java. It's useful for handling large amounts of data Mar 18, 2023 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. The basic idea behind RLE is to represent consecutive identical elements, called a “run” in a data stream by a single value and its count rather than as the original run. Service Annotation: The @GrpcService annotation indicates that this class is a gRPC service, allowing Spring Boot to recognize it. When working with Java strings, following best practices to ensure clean and maintainable code is necessary. compress(s) method, we can get compress the bytes of string by using zlib. Jul 23, 2025 · It typically works by locating similar strings/characters within a text file and replacing them with a temporary binary representation to reduce the overall file size. Mar 2, 2023 · Given an array of characters chars, compress it using the following algorithm: Begin with an empty string s. Present in FileInputStream. Data Compression: Strings can be compressed to reduce the amount of storage required to store them. Dec 2, 2024 · Explanation: Both s1 and s2 point to the same string object "hello" in the String Pool, so s1 == s2 returns true. “String Compression Algorithm” or “Run Length Encoding” happens when you compress a string, and the consecutive duplicates of each string are replaced with the character, followed by the consecutive, repeated character count. The function returns the number of bytes of the compressed data. Features of StringBuffer Class The key features of StringBuffer class are listed below: Unlike String, we can modify the content of the StringBuffer without Jul 11, 2025 · In Java, the String. io. Method Override: The sayHello method is overridden from the base class. You may assume that the input string is always valid; there are no extra white spaces, square brackets Jul 23, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. Example #1 : In this example we can see that by using zlib. Apr 7, 2023 · The auxiliary space complexity is also O (n), where n is the number of characters in the input string. Intuitions, example walk through, and complexity analysis. May 3, 2013 · I am using the following code to compress and decompress string data, but the problem which I am facing is, it is easily getting compressed without error, but the decompress method throws the follo Jul 11, 2025 · In Java, to remove all white spaces from a String, there are several ways like using replaceAll() or manual iteration over characters. Jul 23, 2025 · In Java programming, there are a lot of ways to concatenate multiple strings. For this, we have taken three or more String values then we concatenate those String values by using different ways. Each leaf node corresponds to the stored string, which is a chain of Jul 23, 2025 · Efficient storage of data: Bitwise algorithms play a crucial role in data compression techniques like Huffman coding. Gain a clear understanding of what strings are and their importance in Java programming. Established a set (2-3) of test cases to verify their own solution later Jul 23, 2025 · Compression techniques are useful for reducing file sizes for storage, minimizing bandwidth during transmission and enabling faster uploading/downloading of web content over the internet. Constructors and Description DeflaterOutputStream (OutputStream out) : Creates a new output stream with a default compressor and buffer size Aug 31, 2025 · A string is a sequence of characters. ZipEntry (ZipEntry e) : Creates a new zip entry with fields taken from the specified zip entry. GZIPInputStream) can be used to decompress files that are compressed with the GZIP compression algorithm, for instance via the GZIPOutputStream class. In this article, will look at the functions of string computations. lang package) provides a mutable sequence of characters. The task is to encrypt the string such that the substrings having same prefix as itself are replaced by a *. Example: To compare two strings in Java, the most common method is equals (). In this article, we will learn multiple ways to compare two strings in Java with simple examples. Jul 23, 2025 · In Java, strings are frequently used, and optimizing their creation can help improve performance, especially when creating many strings in a program. e. What is the string compression algorithm? Problem Given an input string of a certain length, design an algorithm that compresses the string. Jul 26, 2025 · A trie is a data structure that stores strings like a tree data structure. String compression is a fundamental problem in computer science and programming, where the objective is to compress a string by counting consecutive repeated characters. Example: Using the new keyword creates a new string object. Apr 28, 2025 · Given a string str of length n, your task is to find its hash value using polynomial rolling hash function. We will also be decoding our image with help of a button. Example: The String. This is normally used in formatting outputs or aligning texts. It works by assigning the variable-length codes to the input characters with the shorter codes assigned to the more frequent characters. Given a string s, Your task is to complete the function encode that returns the run length encoded string for the given string. Discover the principles behind Jul 15, 2025 · String matching is a process of finding a smaller string inside a larger text. Nov 11, 2025 · In Java, the StringBuilder class (part of the java. In Java, every object has its own hash code. java file. Internally uses Hashing, hence allows efficient key-based retrieval, insertion, and removal with an average of O (1) time. , using UTF 16-bit encoding. However, Java provides three different classes for handling string-related operations, String, StringBuilder, and StringBuffer. There are two types of file compression, Lossy compression: Lossy compression shrinks a file by permanently removing certain elements, particularly redundant elements. Zlib Module in Node. Better than official and forum solutions. The following facts make string an interesting data structure. It is also used as the basis for other May 18, 2012 · for taking care of last characters, you can just add a special case before returning the string, look out for my answer. For example, the string aabcccccaaa would become a2b1c5a3. The nodes of a compressed trie can be stored by storing index ranges at the nodes. Questions often focus on string manipulation techniques such as searching, concatenation, reversal, and substring extraction. InputStream java. Jul 23, 2025 · It implements the Enumeration interface. Share your learnings on Link Super Repository for Coding Interview Preperation. There are so many operators in Java, among all, bitwise operators are used to perform operations at the bit level. A string acts the same as an array of characters. It’s a common programming task used in algorithms, data processing, and interviews. Given two strings, S and T where S is a normal string and T is a compressed string, determin Valid Compressed String | Easiest Solution💥😃Problem of the Day #geeksforgeeks #leetcode CODE with Rahul. In C++, a stream/sequence of characters is stored in a char array. proto file. This blog post will explore the fundamental concepts of Java string compression, provide usage methods, discuss common practices, and offer Sep 14, 2023 · The java. Oct 7, 2025 · In Java, a String is a sequence of characters that is used to represent text. Example: String Jul 23, 2025 · Given two strings, S and T where S is a normal string and T is a compressed string, the task is to determine if the compressed string T can be achieved by compressing the string S. Jul 23, 2025 · Given a string S, the task is to find the length of the shortest compressed string. This results in the prefix-free code meaning no code is a prefix of any other code. You can read a complete description of it in the Wikipedia article on the subject. Jul 12, 2025 · Padding a String in Java involves adding extra characters, which may be spaces, zeros, or other given characters to the beginning or end of a string to meet a desired length. For each group of consecutive repeating characters in chars: If the group's length is 1, append the character to s. It is first of the three steps to be performed in succession while implementing the Burrows-Wheeler Data Compression algorithm that Jul 11, 2025 · In Java, Operators are special symbols that perform specific operations on one or more than one operands. Note that k is guaranteed to be a positive integer. To perform Java String Tokenization, we need to specify an input string and a set of delimiters. Input: "g eeks for ge eeks " Output: "geeksforgeeks" Input: "abc d " Output: "abcd" Apr 28, 2025 · The Apache Commons Lang library is a popular third-party library for working with Strings in Java, and the StringUtils class is a key part of this library. Unlike normal array, strings typically have smaller set of items. To access any character in a String, we need: A non-empty string (say "s") A position/index of the character from where it is to be accessed. synchronizedMap Oct 7, 2024 · Let us consider the basic String operations one by one. It is immutable and provides many built-in methods for operations like concatenation, comparison, and manipulation. GZIPInputStream All Implemented Interfaces: Closeable, AutoCloseable public class Problem Highlights 🔗 Geeksforgeeks Link: Run Length Encoding 💡 Difficulty: Medium ⏰ Time to complete: 20 mins 🛠️ Topics: Array 🗒️ Similar Questions: String Compression, Count and Say ## 1: U-nderstand Understand what the interviewer is asking for by using test cases and questions about the problem. Sep 12, 2023 · Java. This method is most useful when you deal with text manipulation, parsing, or data extraction. This is straightforward but can be slow if used repeatedly. Jul 23, 2025 · String equals () method in Java compares the content of two strings. These classes provide useful methods that can be used for compressing the file content. Java provides a rich API to zip and unzip the files. Jul 23, 2025 · In this article, we will learn the implementation of Huffman Coding in C. This algorithm makes sure that the most common characters are represented by shorter bit strings, reducing the overall size of the This is our 1st Video on our String PlaylistIn this video we will try to solve a very interesting Problem : "String Compression". security package. The variable-length codes assigned to input characters are Prefix Codes, means the codes (bit sequences) are assigned in such a way that the code assigned to one character is not the Run-length encoding is a string compression method that works by replacing consecutive identical characters (repeated 2 or more times) with the concatenation of the character and the number marking the count of the characters (length of the run). Apr 23, 2025 · Given a string str and an integer k, the task is to reduce the string by applying the following operation any number of times until it is no longer possible: Choose a group of k consecutive identical characters and remove them from the string. Strings are immutable in programming languages like Java, Python, JavaScript and C#. Using replace () The replace () method directly replaces all occurrences of a substring with Jul 23, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. In compressed string characters should be in lowercase. A delimiter is a character or set of characters that separate tokens in the string. It is one of the most fundamental datatypes in C++ and it comes with a huge set of inbuilt functions. Small set of elements. Apr 9, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. The compressed string s should not be returned separately, but instead, be stored in the input character Jul 13, 2020 · Interested to learn about Java Compress? Check our article explaining how to use the DeflatorOutputStream to compress a byte array. Apr 27, 2023 · A special compression mechanism can arbitrarily delete 0 or more characters and replace them with the deleted character count. By making this application we will be able to learn that how we can encode an image in Base64. There are two types of string matching algorithms: Exact String Matching Algorithms Approximate String Matching Algorithms To understand more about matching algorithms refer to: String Matching Apr 28, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. The String equals () method overrides the equals () method of the object class. The method signature is: “public static String compress (String input)” You must write all code in proper Java Solutions to problems encountered in Coding Ninjas' Introduction to Java Course - sa1123/Coding-Ninjas-Java String Compression using count of repeated characters - Run Length Encoding Objective: Write an algorithm to compress the given string by using the count of repeated characters and if new compressed string length is not smaller than the original string then return the original string. Jan 28, 2019 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. Here are some essential best practices for string manipulation in Java. and Values can be duplicated. Ex input: AAABBBBCC Ex output: 3A4B2C Well, this is quite embarrassing and I couldn't manage to do it on the intervie Nov 13, 2025 · The StringBuffer class in Java represents a sequence of characters that can be modified, which means we can change the content of the StringBuffer without creating a new object every time. Note: StringTokenizer is a legacy class, and the split() method is preferred for modern applications. zip. Oct 11, 2025 · In Java, a String represents a sequence of characters used for storing and manipulating text. Jul 23, 2025 · Zip files are compressed files that is used for transferring files over the internet. Each node has from 1 to N children. The Lempel-Ziv-Welch (LZW) algorithm provides loss-less data compression. It represents a mutable sequence of characters. In this article, we have used two different ways, we will explain each method with one example for a better understanding of the concept. Jul 8, 2021 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. Java provides a robust and flexible API for handling strings, allowing for various operations such as concatenation, comparison and manipulation. We will discuss key points on strings as well different types of questions based on that. Dec 29, 2016 · Implement a method to perform basic string compression using the counts of repeated characters. DeflaterInputStream class in Java This class implements an output stream filter for compressing data in the "deflate" compression format. Example 1: Input: S = "aaABBb" Output: "3a3b" Explanation: As 'a' ap Jul 11, 2025 · Huffman Coding is a lossless data compression algorithm where each character in the data is assigned a variable length prefix code. int read() write (): Writes a byte of data, Present in Jul 23, 2025 · Given a string S, the task is to find the length of the shortest compressed string. Jul 12, 2025 · Given string str of the type "3 (ab)4 (cd)", the task is to expand it to "abababcdcdcdcd" where integers are from the range [1, 9]. Unlike the String class (which is immutable), StringBuilder allows modification of character sequences without creating new objects, making it memory-efficient and faster for frequent string operations. List will be used to save character and its number of occurrences in string which will be ultimately concatenated to generate a final compressed string. The idea is to assign variable-length codes to input characters, lengths of the assigned codes are based on the frequencies of corresponding characters. Data Compression Techniques Data compression can be divided into two categories: lossless and lossy. HashMap is not thread-safe, to make it synchronized, use Collections. Nov 12, 2025 · In Java programming, dealing with large strings can be a resource - intensive task. Oct 25, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. For example, searching for the word "apple" in a paragraph. Sep 12, 2025 · A JavaScript String is a sequence of characters, typically used to represent text. Technically, it is a lexicographical reversible permutation of the characters of a string. Jun 18, 2020 · This video unravel the power of strings in Java, an essential topic for every Java developer. This problem was asked in ThoughtWorks interview held in October 2018. Jul 23, 2025 · A rolling hash is a hash function that is used to efficiently compute a hash value for a sliding window of data. We can concatenate the strings using this method, and at the same time, we can format the output with options such as width, alignment, decimal places, and more. InflaterInputStream java. String compression is a technique that allows you to reduce the size of a string, which in turn can save memory and improve the efficiency of data storage and transmission. Any string of length 1 is always a palindrome. decompress(string) Return : Return decompressed string. Dec 6, 2024 · Given a string, remove all spaces from the string and return it. Mastering these concepts can help you effectively tackle Jul 23, 2025 · Hash code is an Integer number (random or non-random). It uses Gzip and Deflate/Inflate algorithms to reduce data size, improving performance and saving bandwidth in Node. Examples: Valid Compressed String | Easiest Solution💥😃Problem of the Day #geeksforgeeks #leetcode CODE with Rahul. Although your answer is correct, you really don't need # and all, just have simple counter and reset it, whenever the current and next character changes. Your Java text segment is converted into bytecode after compilation which carries the . Object java. Easy Problems: Jul 23, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. Compressing a File using DeflaterOutputStream This class implements an output stream filter for compressing data in the "deflate" compression format. charAt(k); Below is the Oct 11, 2025 · In Java, strings are widely used to store and manipulate text. Example: In this example, we will check if a string contains only digits. decompress(s) method, we are able to decompress the compressed string in the byte format of string by using this method. In this article, we will learn how to use the matches() method effectively in Java with examples to illustrate its functionality. How to build a Suffix Tree for a given text? As discussed above, Suffix Tree is compressed trie of all suffixes, so following are very abstract steps to build a suffix tree from given Jul 23, 2025 · Strings are essential data structures used to represent sequences of characters and are frequently encountered in coding interviews. Jul 23, 2025 · Pattern Matching: Strings can be searched for patterns, such as regular expressions or specific sub-strings, to extract or process data in a specific way. java. One can easily print letters in alphabetical order which isn't possible with hashing. These operators are useful when we work with low-level programming, bit manipulation tasks like Dec 19, 2024 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. They can efficiently represent and process compressed data by manipulating bits directly. Apr 9, 2024 · DATA COMPRESSION AND ITS TYPES Data Compression, also known as source coding, is the process of encoding or converting data in such a way that it consumes less memory space. String in Java A String in Java is an immutable sequence of characters, meaning once a String object is created, it cannot be changed. What is Huffman Coding? Huffman Coding is a lossless data compression algorithm. For Example: Input: "python java python html python" Replace "python" --> "c++" Output: "c++ java c++ html c++" Below are multiple methods to replace all occurrences efficiently. This method handles the logic for responding to the Jul 23, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. Sep 20, 2024 · Explanation of the Code Imports: Necessary classes are imported, including request and response classes generated from the . May 11, 2025 · Given a string s , The task is to remove all the consecutive duplicate characters of the string and return the resultant string. compress(s) method, we are able to compress the string in the byte format by using this method. Diagrammatic Representation of String Interning in Java In the diagram, the second reference str2 points to the String Constant Pool (SCP) where the string "Geeks" already exists, demonstrating the concept of string interning in Java. Feb 1, 2024 · Run-length Encoding is a simple yet effective form of lossless data compression. Jul 12, 2025 · Java 9 introduced the concept of compact Strings. So modulo operator is a compressor in our implementation. Oct 4, 2025 · JDK Version Compile and Run Java Code using JDK: You can use the JDK compiler to convert your Java text file into an executable program. Jul 11, 2025 · The parseDouble () method of the Java Double class is a built-in method in Java that returns a new double initialized to the value represented by the specified String, as done by the valueOf method of class Double. Here we are saving the file as Hello. decompress(s) method. Compressing a File using GZIPOutputStream Methods used in the program read (): Reads a byte of data. Comparing strings is the most common task in different scenarios such as input validation or searching algorithms. Jul 23, 2025 · Your All-in-One Learning Portal: GeeksforGeeks is a comprehensive educational platform that empowers learners across domains-spanning computer science and programming, school education, upskilling, commerce, software tools, competitive exams, and more. There are two ways to store strings as character array (char p [20]) or a pointer pointing to a string (char* s = “string”), both of which can be accessed as arrays. class extension. Note: A compression mechanism can arbitrarily delete X (X >= 0) characters and replace them with the deleted character count (X). hivvkl mnoopyyp peix edr des wod mnjjqt dpvjqoor dmnqq drzji qvrminh bat khptcq yvvviyj apd