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Conversion Between String, StringBuilder, and StringBuffer

Last Updated: 20 February 2026

In Java, String, StringBuilder, and StringBuffer are used to handle text data, but they differ in mutability and thread safety. Understanding how to convert between them i...read more

Java StringBuilder delete(int start, int end) Method

Last Updated: 23 July 2025

delete(int start, int end) method in the StringBuilder class is used to remove a portion of the string, starting from the specified start index to the specified end index....read more

Java

Java-StringBuilder

Find the string of length N according to the given conditions

Last Updated: 29 January 2024

Given two integers N and K. Then your task is to output the string of length N such that the cumulative sum of the string is equal to K:Where the Cumulative sum of the str...read more

Geeks Premier League 2023

Check if it is possible to make all elements into 1 except obstacles

Last Updated: 30 March 2023

Given a matrix M[][] of size N * M containing characters 0 and X. You have to choose a sub-matrix of 2*2 size, which doesn't contains X in it, and convert all the 0 under ...read more

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DSA

Java-StringBuilder

When to use Rope over StringBuilder in Java?

Last Updated: 23 July 2025

What are Ropes?Rope is a binary tree data structure where each node except the leaf contains the number of characters present to the left of the node.They are mainly used ...read more

Java

Picked

Java-StringBuilder

Check if a palindromic string can be obtained by concatenating substrings split from same indices of two given strings

Last Updated: 23 July 2025

Given two strings A and B of length N, the task is to check if any of the two strings formed by splitting both the strings at any index i (0 ≤ i ≤ N - 1) and concatenating...read more

Swap the first and last character of a string in Java

Last Updated: 15 July 2025

Given string str, the task is to write a Java program to swap the first and the last character of the given string and print the modified string.Examples:Input: str = "Gee...read more

Remove first and last character of a string in Java

Last Updated: 15 July 2025

Given a string str, the task is to write the Java Program to remove the first and the last character of the string and print the modified string.Examples:Input: str = "Gee...read more

StringBuffer vs StringBuilder in Java

Last Updated: 28 May 2026

StringBuffer and StringBuilder are classes in Java used to create and modify mutable strings. Unlike the String class, their content can be changed without creating a new ...read more

Last Updated: 16 June 2026

A String in Java is an object used to store a sequence of characters enclosed in double quotes. It uses UTF-16 encoding and provides methods for handling text data.Each ch...read more

StringBuilder Class in Java

Last Updated: 08 May 2026

In Java, the StringBuilder class (part of the java.lang package) provides a mutable sequence of characters. Unlike the String class (which is immutable), StringBuilder all...read more

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Java

Java-lang package

Java-Class and Object

Java-StringBuilder

Replace a character at a specific index in a String in Java

Last Updated: 11 July 2025

In Java, here we are given a string, the task is to replace a character at a specific index in this string.Examples of Replacing Characters in a StringInput: String = "Gee...read more

StringBuilder appendCodePoint() method in Java with Examples

Last Updated: 13 December 2021

The appendCodePoint(int codePoint) method of StringBuilder class is the inbuilt method used to append the string representation of the codePoint argument to this sequence....read more

StringBuilder trimToSize() method in Java with Examples

Last Updated: 30 July 2019

The trimToSize() method of StringBuilder class is the inbuilt method used to trims the capacity used for the character sequence of StringBuilder object. If the buffer used...read more

StringBuilder toString() method in Java with Examples

Last Updated: 11 July 2025

The toString() method of the StringBuilder class is the inbuilt method used to return a string representing the data contained by StringBuilder Object. A new String object...read more

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