Java NIO Buffer中各种状态属性的含义

关于NIO Buffer中的3个重要状态属性的含义： postion, limit与capacity。

public class NioTest

{

    public static void main(String[] args) {

        IntBuffer buffer = IntBuffer.allocate(10);

        System.out.println("capacity:" + buffer.capacity());

        for(int i = 0 ; i < 5; i++){

            int randomNumber = new SecureRandom().nextInt(20);

            buffer.put(randomNumber);

        }

        System.out.println("before flip limit: " + buffer.limit());

        buffer.flip();

        System.out.println("after flip limit: " + buffer.limit());

        while (buffer.hasRemaining()){

            System.out.println("position: " + buffer.position());

            System.out.println("limit: " + buffer.limit());

            System.out.println("capacity: " + buffer.capacity());

            System.out.println(buffer.get());

        }

    }

}

　　输出结果：

capacity:10

before flip limit: 10

after flip limit: 5

position: 0

limit: 5

capacity: 10

7

position: 1

limit: 5

capacity: 10

14

position: 2

limit: 5

capacity: 10

11

position: 3

limit: 5

capacity: 10

14

position: 4

limit: 5

capacity: 10

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