Date: 2013apr28 Update: 2025sep18 Language: Java Class: NIO Q. Java: Best way to convert a ByteBuffer to a String A. Use the 4-parameter constructor of String. As shown in this full example:

import java.io.UnsupportedEncodingException; import java.nio.ByteBuffer; class Demo { public static void main(String []args) { // // Make a ByteBuffer // byte[] data = { 'a', 'b', 'c' }; ByteBuffer bb = ByteBuffer.wrap(data); // // Convert it to a String // // Or get the length in a way more suitable to your application final int bytesRead = bb.capacity(); String str = null; try { // The 4 paramter constructor str = new String(bb.array(), 0, bytesRead, "UTF-8"); } catch (UnsupportedEncodingException ex) { // Won't happen } System.out.println("str=" + str); } }

Output:

str=abc