StringBuffer replace method

With this example we are going to demonstrate how to use replace method of StringBuffer. A StringBuffer is a thread-safe, mutable sequence of characters. A string buffer is like a String, but can be modified. At any point in time it contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls. In short, to use replace method of StringBuffer you should:

  • Create a new StringBuffer initialized to the contents of the specified string.
  • Use append(String str) API method of StringBuffer. This method appends the specified string to this character sequence.
  • Use replace(int start, int end, String str) API method of StringBuffer. This method replaces the characters in a substring of this sequence with characters in the specified String.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;

public class StringBufferReplaceMethod {
	public static void main(String[] args) {
		StringBuffer sb = new StringBuffer();
		sb.append("Java Code Geeks");
		System.out.println("Original Text: " + sb);
		sb.replace(0, 9, "Hello");
		System.out.println("Replaced Text : " + sb);



Original Text: Java Code Geeks
Replaced Text : Hello Geeks

This was an example of how to use replace method of StringBuffer in Java.

Byron Kiourtzoglou

Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.
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