Java I/O How to - Convert ByteBuffer to CharBuffer

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Question

We would like to know how to convert ByteBuffer to CharBuffer.

Answer

import java.nio.Buffer;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.CharBuffer;
//from   w  w w. jav  a  2  s.c o m
public class MainClass {
  public static void main(String[] argv) throws Exception {
    ByteBuffer byteBuffer = ByteBuffer.allocate(7).order(ByteOrder.BIG_ENDIAN);
    CharBuffer charBuffer = byteBuffer.asCharBuffer();

    byteBuffer.put(0, (byte) 0);
    byteBuffer.put(1, (byte) 'H');
    byteBuffer.put(2, (byte) 0);
    byteBuffer.put(3, (byte) 'i');
    byteBuffer.put(4, (byte) 0);
    byteBuffer.put(5, (byte) '!');
    byteBuffer.put(6, (byte) 0);

    println(byteBuffer);
    println(charBuffer);

    // now slice it differently
    byteBuffer.position(4);
    charBuffer = byteBuffer.asCharBuffer();

    println(byteBuffer);
    println(charBuffer);
  }

  // Print info about a buffer
  private static void println(Buffer buffer) {
    System.out.println("pos=" + buffer.position() + ", limit=" + buffer.limit() + ", capacity="
        + buffer.capacity() + ": '" + buffer.toString() + "'");
  }
}

The code above generates the following result.

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