Java DoubleBuffer slice()用法及代码示例

java.nio.DoubleBuffer类的slice()方法用于创建一个新的双缓冲区，其内容是给定缓冲区内容的共享子序列。

新缓冲区的内容将从该缓冲区的当前位置开始。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。

新缓冲区的位置将为零，其容量和限制将为该缓冲区中剩余的双精度数，并且其标记将不确定。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 slice()

返回值：此方法返回新的双缓冲区。

下面是说明slice()方法的示例：

范例1：

// Java program to demonstrate 
// slice() method 
  
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 fb1 = DoubleBuffer.allocate(capacity); 
  
            // putting the value in Doublebuffer 
            fb1.put(8.56F); 
            fb1.put(9.61F); 
  
            // print the DoubleBuffer 
            System.out.println("Original DoubleBuffer: "
                               + Arrays.toString(fb1.array())); 
  
            // print the DoubleBuffer position 
            System.out.println("\nposition:  " + fb1.position()); 
  
            // print the DoubleBuffer capacity 
            System.out.println("\ncapacity:  " + fb1.capacity()); 
  
            // Creating a shared subsequance buffer of given DoubleBuffer 
            // using slice() method 
            DoubleBuffer fb2 = fb1.slice(); 
  
            // print the shared subsequance buffer 
            System.out.println("\nshared subsequance DoubleBuffer: "
                               + Arrays.toString(fb2.array())); 
  
            // print the DoubleBuffer position 
            System.out.println("\nposition:  " + fb2.position()); 
  
            // print the DoubleBuffer capacity 
            System.out.println("\ncapacity:  " + fb2.capacity()); 
        } 
  
        catch (IllegalArgumentException e) { 
  
            System.out.println("IllegalArgumentException catched"); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("ReadOnlyBufferException catched"); 
        } 
    } 
}

输出：

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

position:  2

capacity:  10

shared subsequance DoubleBuffer: [8.5600004196167, 9.609999656677246, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]

position:  0

capacity:  8

范例2：

// Java program to demonstrate 
// slice() method 
  
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 fb1 = DoubleBuffer.allocate(capacity); 
  
            // putting the value in Doublebuffer 
            fb1.put(8.56F); 
            fb1.put(9.61F); 
            fb1.put(0.56F); 
            fb1.put(3.61F); 
  
            // print the DoubleBuffer 
            System.out.println("Original DoubleBuffer: "
                               + Arrays.toString(fb1.array())); 
  
            // print the DoubleBuffer position 
            System.out.println("\nposition:  " + fb1.position()); 
  
            // print the DoubleBuffer capacity 
            System.out.println("\ncapacity:  " + fb1.capacity()); 
  
            // Creating a shared subsequance buffer of given DoubleBuffer 
            // using slice() method 
            DoubleBuffer fb2 = fb1.slice(); 
            fb2.put(2.34F); 
            fb2.put(6.34F); 
  
            // print the shared subsequance buffer 
            System.out.println("\nshared subsequance DoubleBuffer: "
                               + Arrays.toString(fb2.array())); 
  
            // print the DoubleBuffer position 
            System.out.println("\nposition:  " + fb2.position()); 
  
            // print the DoubleBuffer capacity 
            System.out.println("\ncapacity:  " + fb2.capacity()); 
        } 
  
        catch (IllegalArgumentException e) { 
  
            System.out.println("IllegalArgumentException catched"); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("ReadOnlyBufferException catched"); 
        } 
    } 
}

输出：

Original DoubleBuffer: [8.5600004196167, 9.609999656677246, 0.5600000023841858, 3.609999895095825, 0.0, 0.0, 0.0, 0.0, 0.0, 0.0]

position:  4

capacity:  10

shared subsequance DoubleBuffer: [8.5600004196167, 9.609999656677246, 0.5600000023841858, 3.609999895095825, 2.3399999141693115, 6.340000152587891, 0.0, 0.0, 0.0, 0.0]

position:  2

capacity:  6

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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 slice() 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。