// newio/UsingBuffers.java

// (c)2021 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://OnJava8.com for more book information.

import java.nio.*;

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());

}

}

/* Output:

UsingBuffers

sUniBgfuefsr

UsingBuffers

*/