Example of Using Buffers

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Contents

[edit] Overview - Example of Using Buffers

This is an example of Java program.

[edit] Java Source Code

  • Package: com.bruceeckel
  • File: UsingBuffers.java 
package com.bruceeckel;
 
//: c12:UsingBuffers.java
//From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
//www.BruceEckel.com. See copyright notice in CopyRight.txt.
 
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
 
public class UsingBuffers {
    private static void symmetricScramble(CharBuffer buffer) {
	while (buffer.hasRemaining()) {
	    buffer.mark();
	    char c1 = buffer.get();
	    char c2 = buffer.get();
	    buffer.reset();
	    buffer.put(c2).put(c1);
	}
    }
 
    public static void main(String[] args) {
	char[] data = "UsingBuffers".toCharArray();
	ByteBuffer bb = ByteBuffer.allocate(data.length * 2);
	CharBuffer cb = bb.asCharBuffer();
	cb.put(data);
	System.out.println(cb.rewind());
	symmetricScramble(cb);
	System.out.println(cb.rewind());
	symmetricScramble(cb);
	System.out.println(cb.rewind());
 
    }
}

[edit] What Result You Can Get

Run the program, you will get: 


UsingBuffers
sUniBgfuefsr
UsingBuffers

[edit] Required External Library for this Java Example

Need nothing.


[edit] How to Run this Java Example Program

We recommend running this Java example program with Eclipse.

For assistance in working with Eclipse, please see How to Run Java Program with Eclipse.

It's fairly easy.

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