Java ShortBuffer的flip()方法及示例

java.nio.ShortBuffer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 ShortBuffer flip()

返回值： 该方法返回翻转的 ShortBuffer 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 short array
        short[] db
            = { 10, 20, 30 };
  
        // wrap the short array
        // into ShortBuffer
        // using wrap() method
        ShortBuffer shortBuffer
            = ShortBuffer.wrap(db);
  
        // set position at index 1
        shortBuffer.position(1);
  
        // print the buffer
        System.out.println(
            "Buffer before flip: "
            + Arrays.toString(
                  shortBuffer.array())
            + "\nPosition: "
            + shortBuffer.position()
            + "\nLimit: "
            + shortBuffer.limit());
  
        // Flip the Buffer
        // using flip() method
        shortBuffer.flip();
  
        // print the buffer
        System.out.println(
            "\nBuffer after flip: "
            + Arrays.toString(
                  shortBuffer.array())
            + "\nPosition: "
            + shortBuffer.position()
            + "\nLimit: "
            + shortBuffer.limit());
    }
}

输出:

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

Buffer after flip: [10, 20, 30]
Position: 0
Limit: 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 ShortBuffer
        // using allocate() method
        ShortBuffer shortBuffer
            = ShortBuffer.allocate(4);
  
        // put short value in ShortBuffer
        // using put() method
        shortBuffer.put((short)20);
        shortBuffer.put((short)345);
  
        // set position at index 1
        shortBuffer.position(1);
  
        // print the buffer
        System.out.println(
            "Buffer before flip: "
            + Arrays.toString(
                  shortBuffer.array())
            + "\nPosition: "
            + shortBuffer.position()
            + "\nLimit: "
            + shortBuffer.limit());
  
        // Flip the Buffer
        // using flip() method
        shortBuffer.flip();
  
        // print the buffer
        System.out.println(
            "\nBuffer after flip: "
            + Arrays.toString(
                  shortBuffer.array())
            + "\nPosition: "
            + shortBuffer.position()
            + "\nLimit: "
            + shortBuffer.limit());
    }
}

输出:

Buffer before flip: [20, 345, 0, 0]
Position: 1
Limit: 4

Buffer after flip: [20, 345, 0, 0]
Position: 0
Limit: 1

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