package com.cg.io;import java.io.*;
import java.nio.*;
import java.nio.channels.*;public class TestIntBuffer {static private final byte message[] = {83, 111, 109, 101, 32, 98, 98};static private String fileName = "d:\\hehehe\\test.txt";public static void main(String[] args) throws Exception {FileOutputStream fout = new FileOutputStream(fileName);FileChannel fc = fout.getChannel();ByteBuffer byteBuffer = ByteBuffer.allocate(1024);output("初始化", byteBuffer);for (int i=0; i<message.length; ++i) {byteBuffer.put(message[i]);}byteBuffer.flip();output("调用flip()", byteBuffer);fc.write(byteBuffer);output("调用write()", byteBuffer);fout.close();byteBuffer.clear();output("调用clear()", byteBuffer);FileInputStream fin = new FileInputStream(fileName);fc = fin.getChannel();fc.read(byteBuffer);output("调用read()", byteBuffer);byteBuffer.flip();output("调用flip()", byteBuffer);while (byteBuffer.remaining() > 0) {byte b = byteBuffer.get();System.out.print(((char)b));}output("调用getChannel()", byteBuffer);byteBuffer.clear();output("调用clear()", byteBuffer);fin.close();IntBuffer intBuffer = IntBuffer.allocate(8);for (int i=0; i < intBuffer.capacity(); ++i) {int j = 2 * (i + 1);intBuffer.put(j);}intBuffer.flip();while (intBuffer.hasRemaining()) {int j = intBuffer.get();System.out.print(j + " ");}}public static void output(String step, Buffer buffer){System.out.println(step + " : ");System.out.println("capacity: " + buffer.capacity() + ", ");System.out.println("position: " + buffer.position() + ", ");System.out.println("limit: " + buffer.limit() + ", ");System.out.println();}
}