缓冲区和Buffer
import java.nio.IntBuffer;//=================================================// File Name : IntBuffer_demo//------------------------------------------------------------------------------// Author : Common//主类//Function : IntBuffer_demopublic class IntBuffer_demo { public static void main(String[] args) { // TODO 自动生成的方法存根 IntBuffer buf = IntBuffer.allocate(10); //开辟10个大小的缓冲区 System.out.print("1.写入数据之前的position、limit和capacity"); System.out.println("position="+buf.position()+"、limit="+buf.limit()+"、capacity="+buf.capacity()); int temp[] = {3,5,7}; //定义整型数组 buf.put(3); //向缓冲区写入数据 buf.put(temp); //向缓冲区中写入一组数据 System.out.print("2.写入数据之后的position、limit和capacity"); System.out.println("position="+buf.position()+"、limit="+buf.limit()+"、capacity="+buf.capacity()); buf.flip(); //重设缓冲区，改变指针 System.out.print("3.准备输出数据时的position、limit和capacity"); System.out.println("position="+buf.position()+"、limit="+buf.limit()+"、capacity="+buf.capacity()); while(buf.hasRemaining()){ int x = buf.get(); System.out.print(x+"、"); } }} 
创建子缓冲区
import java.nio.IntBuffer;//=================================================// File Name : IntBuffer_demo//------------------------------------------------------------------------------// Author : Common//主类//Function : IntBuffer_demopublic class IntBuffer_demo { public static void main(String[] args) { // TODO 自动生成的方法存根 IntBuffer buf = IntBuffer.allocate(10); //开辟10个大小的缓冲区 IntBuffer sub = null; //定义缓冲区对象 for(int i=0;i<10;i++){ buf.put(2*i+1); } buf.position(2); buf.limit(6); sub = buf.slice(); //开辟子缓冲区 for(int i=0;i 
import java.nio.IntBuffer;//=================================================// File Name : IntBuffer_demo//------------------------------------------------------------------------------// Author : Common//主类//Function : IntBuffer_demopublic class IntBuffer_demo { public static void main(String[] args) { // TODO 自动生成的方法存根 IntBuffer buf = IntBuffer.allocate(10); //开辟10个大小的缓冲区 IntBuffer read = null; //定义缓冲区对象 for(int i=0;i<10;i++){ buf.put(2*i+1); } read = buf.asReadOnlyBuffer(); //创建只读缓冲区 buf.flip(); //重设缓冲区 System.out.println("主缓冲区中的内容："); while(buf.hasRemaining()){ int x = buf.get(); //取出当前内容 System.out.print(x+"、"); } System.out.println(); read.put(30); //错误，不可写 }} 
