nio~ByteOrder

*ByteOrder定义了写入buffer时字节的顺序

---java默认是big-endian

*API

---2个内置的ByteOrder

ByteOrder.BIG_ENDIAN和ByteOrder.LITTLE_ENDIAN

---ByteOrder.nativeOrder()

返回本地jvm运行的硬件的字节顺序.使用和硬件一致的字节顺序可能使buffer更加有效.

---ByteOrder.toString()

返回ByteOrder的名字,BIG_ENDIAN或LITTLE_ENDIAN

*示例

/**
 * Feb 25, 2011 by dzh
 */
package buffer.endian;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;

/**
 * @author dzh
 *
 */
public class ByteOrderTest {
	public static void main(String[] args) {
		ByteBuffer buf =ByteBuffer.allocate(4);
		System.out.println("Default java endian: "+buf.order().toString()); 
		
		buf.putShort((short) 1);
		buf.order(ByteOrder.LITTLE_ENDIAN);
		System.out.println("Now: "+buf.order().toString());
		buf.putShort((short) 2);
		
		buf.flip();
		for(int i=0;i<buf.limit();i++)
			System.out.println(buf.get()&0xFF); 
		
		System.out.println("My PC: "+ByteOrder.nativeOrder().toString());
	}
}

//结果
Default java endian: BIG_ENDIAN
Now: LITTLE_ENDIAN
0
1
2
0
My PC: LITTLE_ENDIAN