FileChannel fc = new FileInputStream("data.txt").getChannel(

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FileChannel fc = new FileInputStream("data.txt").getChannel();
ByteBuffer buff = ByteBuffer.allocate(1024);
fc.read(buff);
buff.flip();?
while (buff.hasRemaining())?这里判断当前位置与限制为之间是否有元素,
System.out.print((char) buff.get());

楼主,给你简单分析下：
1、flip()
使缓冲区为一系列新的通道写入或相对获取操作做好准备：它将限制(limit)设置为当前位置(position),然后将位置(position)设置为 0,将标记mark记为-1.
源码实现如下：
public final Buffer flip()
{
this.limit = this.position;
this.position = 0;
this.mark = -1;
return this;
}
2、hasRemaining()
判断当前位置是否在限制范围内,告知程序在当前位置和限制之间是否有元素,是否继续往下读取数据.
源码如下：
public final boolean hasRemaining()
{
return this.position < this.limit;
}
有问题欢迎提问,

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