Convert Between Character Set Encodings with CharBuffer

In this example we shall show you how to convert between character set encodings with a CharBuffer in Java. To achieve character set conversions in Java one should perform the following steps:

  • Use the Charset class to get the Charset object for utilizing the specific character set
  • Use the newDecoder() API method of the Charset object to construct a new decoder for this charset
  • Use the newEncoder() API method of the Charset object to construct a new encoder for this charset
  • Use the CharBuffer class to wrap the target character sequence into a buffer
  • Use the encode(CharBuffer) and decode(ByteBuffer) API methods of the encoder and decoder objects respectively to convert to/from the specific character encoding – here “ISO-8859-1”

as demonstrated in the code snippet that follows.

package com.javacodegeeks.snippets.core;

import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;

public class ConvertBetweenCharacterSetEncodingsWithCharBuffer {

	public static void main(String[] args) {
		try {
			// Returns a charset object for the named charset.
			Charset charset = Charset.forName("ISO-8859-1");
			// Constructs a new decoder for this charset.
			CharsetDecoder decoder = charset.newDecoder();
			// Constructs a new encoder for this charset.
			CharsetEncoder encoder = charset.newEncoder();
			// Wrap the character sequence into a buffer.
			CharBuffer uCharBuffer = CharBuffer.wrap("Java Code Geeks");
			// Encode the remaining content of a single input character buffer to a new byte buffer.
			// Converts to ISO-8859-1 bytes and stores them to the byte buffer
		    ByteBuffer bbuf = encoder.encode(uCharBuffer);
		    // Decode the remaining content of a single input byte buffer to a new character buffer.
		    // Converts from ISO-8859-1 bytes and stores them to the character buffer
		    CharBuffer cbuf = decoder.decode(bbuf);
		    String s = cbuf.toString();
		    System.out.println("Original String is: " + s);
		catch (CharacterCodingException e) {
			System.out.println("Character Coding Error: " + e.getMessage());



Original String is: Java Code Geeks

This was an example of how to convert between character set encodings in Java.

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Ilias Tsagklis

Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.
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