Java ShortBuffer asReadOnlyBuffer()用法及代碼示例

java.nio.ShortBuffer類的asReadOnlyBuffer()方法用於使用該緩衝區的內容創建一個新的隻讀short緩衝區。新緩衝區是此緩衝區的副本。因此，對該緩衝區內容所做的更改將在新緩衝區中可見。

由於新緩衝區是隻讀緩衝區，因此不允許對其內容進行任何修改。這兩個緩衝區的位置，限製和標記值將是獨立的。新緩衝區的容量，限製，位置和標記值將與此緩衝區相同。如果此緩衝區本身是隻讀的，則此方法的行為與重複方法完全相同。

用法：

public abstract ShortBuffer asReadOnlyBuffer()

返回值：此方法返回新的隻讀short緩衝區，其內容與此緩衝區相同。

下麵是說明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"); 
        } 
    } 
}

輸出：

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); 
        } 
    } 
}

輸出：

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

相關用法

注：本文由純淨天空篩選整理自IshwarGupta大神的英文原創作品 ShortBuffer asReadOnlyBuffer() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。