Java ShortBuffer asReadOnlyBuffer()用法及代码示例

java.nio.ShortBuffer类的asReadOnlyBuffer()方法用于使用该缓冲区的内容创建一个新的只读short缓冲区。新缓冲区是此缓冲区的副本。因此，对该缓冲区内容所做的更改将在新缓冲区中可见。

由于新缓冲区是只读缓冲区，因此不允许对其内容进行任何修改。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。如果此缓冲区本身是只读的，则此方法的行为与重复方法完全相同。

用法：

public abstract ShortBuffer asReadOnlyBuffer()

返回值：此方法返回新的只读short缓冲区，其内容与此缓冲区相同。

下面是说明asReadOnlyBuffer()方法的示例：

程序1：

// Java program to demonstrate 
// asReadOnlyBuffer() 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)961); 
            sb.rewind(); 
  
            // print the ShortBuffer 
            System.out.println("Original ShortBuffer: "
                               + Arrays.toString(sb.array())); 
  
            // Creating a read-only copy of ShortBuffer 
            // using asReadOnlyBuffer() method 
            ShortBuffer shortBuffer = sb.asReadOnlyBuffer(); 
  
            // print the ShortBuffer 
            System.out.print("\nReadOnlyBuffer ShortBuffer: "); 
  
            while (shortBuffer.hasRemaining()) 
                System.out.print(shortBuffer.get() + ", "); 
        } 
  
        catch (IllegalArgumentException e) { 
            System.out.println("IllegalArgumentException catched"); 
        } 
  
        catch (ReadOnlyBufferException e) { 
            System.out.println("ReadOnlyBufferException catched"); 
        } 
    } 
}

输出：

Original ShortBuffer: [856, 0, 961, 0, 0, 0, 0, 0, 0, 0]

ReadOnlyBuffer ShortBuffer: 856, 0, 961, 0, 0, 0, 0, 0, 0, 0,

程序2：

// Java program to demonstrate 
// asReadOnlyBuffer() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) throws Exception 
    { 
  
        // 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)856); 
            sb.put(2, (short)961); 
            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)456); 
            sb1.put(2, (short)645); 
            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 FloatBuffer: "); 
  
            while (readOnlySb.hasRemaining()) 
                System.out.print(readOnlySb.get() + ", "); 
  
            // try to change readOnlySb 
            System.out.println("\n\nTrying to get the array"
                               + " from ReadOnlyFb 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: [856, 0, 961, 0, 0, 0, 0, 0, 0, 0]

ShortBuffer sb1: [0, 456, 645, 0, 0]

ReadOnlyBuffer FloatBuffer: 856, 0, 961, 0, 0, 0, 0, 0, 0, 0, 

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

相关用法

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