Java DoubleBuffer flip()用法及代码示例

java.nio.DoubleBuffer类的flip()方法用于翻转此缓冲区。通过翻转此缓冲区，这意味着将缓冲区修剪到当前位置，然后将位置更改为零。在此过程中，如果缓冲区上有任何标记，则该标记将被自动丢弃。

用法:

public final DoubleBuffer flip()

返回值：此方法返回翻转的DoubleBuffer实例。

下面是说明flip()方法的示例：

范例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 double array 
        double[] db 
            = { 10.56, 20.34, 30.78 }; 
  
        // wrap the double array 
        // into DoubleBuffer 
        // using wrap() method 
        DoubleBuffer doubleBuffer 
            = DoubleBuffer.wrap(db); 
  
        // set position at index 1 
        doubleBuffer.position(1); 
  
        // print the buffer 
        System.out.println( 
            "Buffer before flip:"
            + Arrays.toString( 
                  doubleBuffer.array()) 
            + "\nPosition:"
            + doubleBuffer.position() 
            + "\nLimit:"
            + doubleBuffer.limit()); 
  
        // Flip the Buffer 
        // using flip() method 
        doubleBuffer.flip(); 
  
        // print the buffer 
        System.out.println( 
            "\nBuffer after flip:"
            + Arrays.toString( 
                  doubleBuffer.array()) 
            + "\nPosition:"
            + doubleBuffer.position() 
            + "\nLimit:"
            + doubleBuffer.limit()); 
    } 
}

输出：

Buffer before flip:[10.56, 20.34, 30.78]
Position:1
Limit:3

Buffer after flip:[10.56, 20.34, 30.78]
Position:0
Limit:1

范例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 DoubleBuffer 
        // using allocate() method 
        DoubleBuffer doubleBuffer 
            = DoubleBuffer.allocate(4); 
  
        // put double value in DoubleBuffer 
        // using put() method 
        doubleBuffer.put(20.4); 
        doubleBuffer.put(34.5); 
  
        // set position at index 1 
        doubleBuffer.position(1); 
  
        // print the buffer 
        System.out.println( 
            "Buffer before flip:"
            + Arrays.toString( 
                  doubleBuffer.array()) 
            + "\nPosition:"
            + doubleBuffer.position() 
            + "\nLimit:"
            + doubleBuffer.limit()); 
  
        // Flip the Buffer 
        // using flip() method 
        doubleBuffer.flip(); 
  
        // print the buffer 
        System.out.println( 
            "\nBuffer after flip:"
            + Arrays.toString( 
                  doubleBuffer.array()) 
            + "\nPosition:"
            + doubleBuffer.position() 
            + "\nLimit:"
            + doubleBuffer.limit()); 
    } 
}

输出：

Buffer before flip:[20.4, 34.5, 0.0, 0.0]
Position:1
Limit:4

Buffer after flip:[20.4, 34.5, 0.0, 0.0]
Position:0
Limit:1

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

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注：本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 DoubleBuffer flip() methods in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。