Java IntBuffer flip()方法及实例

java.nio.IntBuffer类 的 flip() 方法是用来翻转这个缓冲区的。通过翻转这个缓冲区，意味着缓冲区将被修剪到当前位置，然后位置将被改变为零。在这个过程中，如果缓冲区上有任何标记，那么这个标记将被自动丢弃。

语法

public final IntBuffer flip()

参数： 该方法不接受任何参数。

返回值： 该方法返回翻转的IntBuffer实例。

下面是说明flip()方法的例子。

例子 1 :

// Java program to demonstrate// flip() method import java.nio.*;import java.util.*; public class GFG {    public static void main(String[] args)    {         // Declare and initialize        // the int array        int[] ib            = { 10, 20, 30 };         // wrap the int array        // into IntBuffer        // using wrap() method        IntBuffer intBuffer            = IntBuffer.wrap(ib);         // set position at index 1        intBuffer.position(1);         // print the buffer        System.out.println(            "Buffer before flip: "            + Arrays.toString(                  intBuffer.array())            + "\nPosition: "            + intBuffer.position()            + "\nLimit: "            + intBuffer.limit());         // Flip the Buffer        // using flip() method        intBuffer.flip();         // print the buffer        System.out.println(            "\nBuffer after flip: "            + Arrays.toString(                  intBuffer.array())            + "\nPosition: "            + intBuffer.position()            + "\nLimit: "            + intBuffer.limit());    }}

输出

Buffer before flip: [10, 20, 30]Position: 1Limit: 3Buffer after flip: [10, 20, 30]Position: 0Limit: 1

例子 2 :

// Java program to demonstrate// flip() method import java.nio.*;import java.util.*; public class GFG {    public static void main(String[] args)    {         // defining and allocating IntBuffer        // using allocate() method        IntBuffer intBuffer            = IntBuffer.allocate(4);         // put int value in IntBuffer        // using put() method        intBuffer.put(20);        intBuffer.put(34);         // set position at index 1        intBuffer.position(1);         // print the buffer        System.out.println(            "Buffer before flip: "            + Arrays.toString(                  intBuffer.array())            + "\nPosition: "            + intBuffer.position()            + "\nLimit: "            + intBuffer.limit());         // Flip the Buffer        // using flip() method        intBuffer.flip();         // print the buffer        System.out.println(            "\nBuffer after flip: "            + Arrays.toString(                  intBuffer.array())            + "\nPosition: "            + intBuffer.position()            + "\nLimit: "            + intBuffer.limit());    }}

输出

Buffer before flip: [20, 34, 0, 0]Position: 1Limit: 4Buffer after flip: [20, 34, 0, 0]Position: 0Limit: 1

参考资料: https://docs.oracle.com/javase/9/docs/api/java/nio/IntBuffer.html#flip-