Java中的 ShortBuffer array() 方法及示例

Java.nio.ShortBuffer的array()方法用于返回支持此缓冲区的短数组（可选）。
对此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。
在调用此方法之前调用 hasArray 方法，以确保此缓冲区具有可访问的后备数组。

语法：

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。

例外：

• 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

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下面的程序说明了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