Java ShortBuffer array()用法及代码示例

java.nio.ShortBuffer的array()方法用于返回支持此缓冲区的short数组(可选)。
对该缓冲区内容的修改将导致返回数组的内容被修改，反之亦然。
在调用此方法之前，请先调用hasArray方法，以确保此缓冲区具有可访问的后备数组。

用法：

public final short[] array()

参数：该方法不带任何参数。

返回值：该方法返回支持缓冲区的数组。

异常：

ReadOnlyBufferException，如果缓冲区由数组支持但为只读
UnsupportedOperationException，如果此缓冲区不受可访问数组的支持

以下示例程序旨在说明array()方法的使用：

程序1：

// Java program to demonstrate 
// array() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the ShortBuffer 
        int capacity = 10; 
  
        // Creating the ShortBuffer 
        try { 
  
            // creating object of Shortbuffer 
            // and allocating size capacity 
            ShortBuffer sb = ShortBuffer.allocate(capacity); 
  
            // putting the value in Shortbuffer 
            sb.put((short)856); 
            sb.put(2, (short)9); 
            sb.rewind(); 
  
            // getting array from fb ShortBuffer using array() method 
            short[] sbb = sb.array(); 
  
            // printing the ShortBuffer fb 
            System.out.println("ShortBuffer: "
                               + Arrays.toString(sbb)); 
        } 
  
        catch (IllegalArgumentException e) { 
  
            System.out.println("IllegalArgumentException catched"); 
        } 
  
        catch (ReadOnlyBufferException e) { 
  
            System.out.println("ReadOnlyBufferException catched"); 
        } 
    } 
}

输出：

ShortBuffer: [856, 0, 9, 0, 0, 0, 0, 0, 0, 0]

程序2：显示ReadOnlyBufferException

// Java program to demonstrate 
// array() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Declaring the capacity of the sb 
        int capacity1 = 10; 
  
        // Declaring the capacity of the sb1 
        int capacity2 = 5; 
  
        // Creating the ShortBuffer 
        try { 
            // 
            // sb 
            // 
            // creating object of Shortbuffer sb 
            // and allocating size capacity 
            ShortBuffer sb = ShortBuffer.allocate(capacity1); 
  
            // putting the value in sb 
            sb.put((short)96); 
            sb.put(2, (short)7); 
            sb.put(3, (short)41); 
            sb.rewind(); 
  
            // print the ShortBuffer 
            System.out.println("ShortBuffer sb: "
                               + Arrays.toString(sb.array())); 
  
            // 
            // sb1 
            // 
            // creating object of Shortbuffer sb1 
            // and allocating size capacity 
            ShortBuffer sb1 = ShortBuffer.allocate(capacity2); 
  
            // putting the value in sb1 
            sb1.put(1, (short)445); 
            sb1.put(2, (short)64); 
            sb1.rewind(); 
  
            // print the ShortBuffer 
            System.out.println("\nShortBuffer sb1: "
                               + Arrays.toString(sb1.array())); 
  
            // Creating a read-only copy of ShortBuffer 
            // using asReadOnlyBuffer() method 
            ShortBuffer readOnlysb = sb.asReadOnlyBuffer(); 
  
            // print the ShortBuffer 
            System.out.print("\nReadOnlyBuffer ShortBuffer: "); 
  
            while (readOnlysb.hasRemaining()) 
                System.out.print(readOnlysb.get() + ", "); 
  
            // try to change readOnlysb 
            System.out.println("\n\nTrying to get the array"
                               + " from ReadOnlysb for editing"); 
  
            short[] sbarr = readOnlysb.array(); 
        } 
        catch (IllegalArgumentException e) { 
            System.out.println("IllegalArgumentException catched"); 
        } 
        catch (ReadOnlyBufferException e) { 
            System.out.println("Exception thrown: " + e); 
        } 
    } 
}

输出：

ShortBuffer sb: [96, 0, 7, 41, 0, 0, 0, 0, 0, 0]

ShortBuffer sb1: [0, 445, 64, 0, 0]

ReadOnlyBuffer ShortBuffer: 96, 0, 7, 41, 0, 0, 0, 0, 0, 0, 

Trying to get the array from ReadOnlysb for editing
Exception thrown: java.nio.ReadOnlyBufferException

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