Java LongBuffer flip()用法及代碼示例

java.nio.LongBuffer類的flip()方法用於翻轉此緩衝區。通過翻轉此緩衝區，這意味著

緩衝區將被修剪到當前位置
則位置將更改為零
如果緩衝區上有任何標記，那麽該標記將被自動丟棄

用法:

public final LongBuffer flip()

參數：此方法不接受任何參數。

返回值：此方法返回翻轉的LongBuffer實例。

下麵是說明flip()方法的示例：

範例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()); 
    } 
}

輸出：

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

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

範例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()); 
    } 
}

輸出：

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

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

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

相關用法

注：本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 LongBuffer flip() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。