[java][nio]从ByteBuffer中获取基本数据类型

import java.nio.ByteBuffer;
/**
 * 
 * 获取基本数据类型.
 *
 */
public class GetData {

	private static final int BSIZE = 1024;
	
	public static void main(String[] args) {

		ByteBuffer bb = ByteBuffer.allocate(BSIZE);
		
		int i = 0;
		printBuffer(bb);
		
		//ByteBuffer实例中每个字节自动分配为0
		while(i++ < bb.limit()){
			int get = bb.get();
			//System.out.println("get: " + get);//get=0
			
			if(get != 0){
				System.out.println("nonzero");
			}
		}
		System.out.println("i = " + i);//1025
		printBuffer(bb);//position=1024
		System.out.println("--------------");
		bb.rewind();//指针移到数据头
		printBuffer(bb);//position=0
		
		//保存并读取一个字符数组
		bb.asCharBuffer().put("Hello world!!");
		char c ;
		while((c = bb.getChar()) != 0 ){
			System.out.print(c + " ");
		}
		printBuffer(bb);//position=28
		bb.rewind();
		
		//保存并读取一个short
		bb.asShortBuffer().put((short)4583442);
		System.out.println(bb.getShort());
		printBuffer(bb);//position=2
		bb.rewind();
		
		//保存并读取一个int
		bb.asIntBuffer().put(856522114);
		System.out.println(bb.getInt());
		printBuffer(bb);//position=4
		bb.rewind();
		
		//保存并读取一个long
		bb.asLongBuffer().put(1286522114);
		System.out.println(bb.getLong());
		printBuffer(bb);//position=8
		bb.rewind();
		
		//保存并读取一个float
		bb.asFloatBuffer().put(1286522114.5F);
		System.out.println(bb.getFloat());
		printBuffer(bb);//position=4
		bb.rewind();
		
		//保存并读取一个double
		bb.asDoubleBuffer().put(1286522114.88);
		System.out.println(bb.getDouble());
		printBuffer(bb);//position=8
		bb.rewind();

	}
	
	static void printBuffer(ByteBuffer bb){
		System.out.println("limit: " + bb.limit());
		System.out.println("position: " + bb.position());
		System.out.println("capacity: " + bb.capacity());
	}

}