Java DoubleBuffer duplicate()用法及代码示例

java.nio.DoubleBuffer类的duplicate()方法用于创建共享给定缓冲区内容的新浮点缓冲区。

新缓冲区的内容就是该缓冲区的内容。对该缓冲区内容的更改将在新缓冲区中可见，反之亦然；这两个缓冲区的位置，限制和标记值将是独立的。

新缓冲区的容量，限制，位置和标记值将与此缓冲区相同。当且仅当该缓冲区是直接缓冲区时，新缓冲区才是直接缓冲区；当且仅当该缓冲区是只读缓冲区时，新缓冲区才是只读缓冲区。

用法:

public abstract DoubleBuffer duplicate()

返回值：此方法返回新的double缓冲区，该缓冲区携带先前的double缓冲区内容

下面是说明duplicate()方法的示例：

示例1:

// Java program to demonstrate 
// duplicate() method 
// Using direct Doublebuffer 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the DoubleBuffer 
        int capacity = 10; 
  
        // Creating the DoubleBuffer 
        try { 
  
            // creating object of Doublebuffer 
            // and allocating size capacity 
            DoubleBuffer db1 = DoubleBuffer.allocate(capacity); 
  
            // putting the value in Doublebuffer 
            db1.put(8.56F); 
            db1.put(2, 9.61F); 
            db1.rewind(); 
  
            // print the Original DoubleBuffer 
            System.out.println("Original DoubleBuffer:  "
                               + Arrays.toString(db1.array())); 
  
            // Creating a duplicate copy of DoubleBuffer 
            // using duplicate() method 
            DoubleBuffer db2 = db1.duplicate(); 
  
            // print the duplicate copy of DoubleBuffer 
            System.out.print("\nDuplicate DoubleBuffer: "
                             + Arrays.toString(db2.array())); 
        } 
  
        catch (IllegalArgumentException e) { 
  
            System.out.println("IllegalArgumentException catched"); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("ReadOnlyBufferException catched"); 
        } 
    } 
}

输出：

Original DoubleBuffer:  [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]

Duplicate DoubleBuffer: [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]

示例2:

// Java program to demonstrate 
// duplicate() method 
// using read-onlyDoublebuffer 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
  
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the DoubleBuffer 
        int capacity = 10; 
  
        // Creating the DoubleBuffer 
        try { 
  
            // creating object of Doublebuffer 
            // and allocating size capacity 
            DoubleBuffer db1 = DoubleBuffer.allocate(capacity); 
  
            // putting the value in Doublebuffer 
            db1.put(8.56F); 
            db1.put(2, 9.61F); 
            db1.rewind(); 
  
            // print the Original DoubleBuffer 
            System.out.println("Original DoubleBuffer:  "
                               + Arrays.toString(db1.array())); 
  
            // Creating a read-only copy of DoubleBuffer 
            // using asReadOnlyBuffer() method 
            DoubleBuffer readonly = db1.asReadOnlyBuffer(); 
  
            // print the read-only copy of DoubleBuffer 
            System.out.print("\nread-only DoubleBuffer:  "); 
            while (readonly.hasRemaining()) 
                System.out.print(readonly.get() + ", "); 
            System.out.println(""); 
  
            // Rewinding the readonly DoubleBuffer 
            readonly.rewind(); 
  
            // Creating a duplicate copy of DoubleBuffer 
            // using duplicate() method 
            DoubleBuffer db2 = readonly.duplicate(); 
  
            // print the duplicate copy of DoubleBuffer 
            System.out.print("\nduplicate copy of read-only DoubleBuffer:  "); 
  
            while (db2.hasRemaining()) 
                System.out.print(db2.get() + ", "); 
            System.out.println(""); 
        } 
  
        catch (IllegalArgumentException e) { 
  
            System.out.println("IllegalArgumentException catched"); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("ReadOnlyBufferException catched"); 
        } 
    } 
}

输出：

Original DoubleBuffer:  [8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]

read-only DoubleBuffer:  8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 

duplicate copy of read-only DoubleBuffer:  8.5600004196167, 0.0, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0,

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注：本文由纯净天空筛选整理自pawan_asipu大神的英文原创作品 DoubleBuffer duplicate() 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。