Java LongBuffer flip()用法及代码示例

java.nio.LongBuffer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

缓冲区将被修剪到当前位置
则位置将更改为零
如果缓冲区上有任何标记，那么该标记将被自动丢弃

用法:

public final LongBuffer flip()

参数：此方法不接受任何参数。

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

输出：

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

Buffer after flip: [10, 20, 30]
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 LongBuffer 
        // using allocate() method 
        LongBuffer longBuffer 
            = LongBuffer.allocate(4); 
  
        // put long value in LongBuffer 
        // using put() method 
        longBuffer.put(20); 
        longBuffer.put(34); 
  
        // set position at index 1 
        longBuffer.position(1); 
  
        // print the buffer 
        System.out.println( 
            "Buffer before flip: "
            + Arrays.toString( 
                  longBuffer.array()) 
            + "\nPosition: "
            + longBuffer.position() 
            + "\nLimit: "
            + longBuffer.limit()); 
  
        // Flip the Buffer 
        // using flip() method 
        longBuffer.flip(); 
  
        // print the buffer 
        System.out.println( 
            "\nBuffer after flip: "
            + Arrays.toString( 
                  longBuffer.array()) 
            + "\nPosition: "
            + longBuffer.position() 
            + "\nLimit: "
            + longBuffer.limit()); 
    } 
}

输出：

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

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

参考： https://docs.oracle.com/javase/9/docs/api/java/nio/LongBuffer.html#mark–

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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 LongBuffer flip() method 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。