learning java NIO 之 CharBuffer

import java.nio.CharBuffer;

public class BufferTest {
    public static void main(String[] args) {
        CharBuffer  buff = CharBuffer.allocate();
        System.out.println("capacity: " + buff.capacity());
        System.out.println("limit: " + buff.limit());;
        System.out.println("position:" + buff.position());

        buff.put('a');
        buff.put('b');
        buff.put('c');
        System.out.println("position:" + buff.position());

        buff.flip();
        System.out.println("limit: " + buff.limit());;
        System.out.println("position:" + buff.position());

        System.out.println(buff.get());
        System.out.println(buff.position());

        buff.clear();
        System.out.println("limit: " + buff.limit());;
        System.out.println("position:" + buff.position());

        System.out.println(buff.get());
        System.out.println("position:" + buff.position());

    }
}

output:

capacity:
limit:
position:
position:
limit:
position:
a

limit:
position:
c
position: