buffertest.java

疯狂Java讲义_源码(含Java设计模式CHM

import java.nio.*;
/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */
public class BufferTest
{
	public static void main(String[] args)
	{
		//创建Buffer
		CharBuffer buff = CharBuffer.allocate(8);	//1
		System.out.println("capacity: "
			+ buff.capacity());
	  	System.out.println("limit: "
			+ buff.limit());
	  	System.out.println("position: "
			+ buff.position());
		//放入元素
	  	buff.put('a');	//2
	  	buff.put('b');	//3
	  	buff.put('c');	//4
	  	
	  	System.out.println("加入三个元素后，position = "
			+ buff.position());
	  	//调用flip()方法
	  	buff.flip();	//5
	  	System.out.println("执行flip()后，limit = "
			+ buff.limit());
	  	System.out.println("position = "
			+ buff.position());
	  	//取出第一个元素
	  	System.out.println("第一个元素（position=0）："
			+ buff.get());	//6	  	
	  	System.out.println("取出一个元素后，position = "
			+ buff.position());
	  	//调用clear方法
	  	buff.clear();	//7
	  	System.out.println("执行clear()后，limit = "
			+ buff.limit());	
	  	System.out.println("执行clear()后，position = "
			+ buff.position());
	  	System.out.println("执行clear()后，缓冲区内容并没有被清除："
			+ buff.get(2));	//8
		System.out.println("执行绝对读取后，position = "
			+ buff.position());
	} 
}