Java中的ShortBuffer asReadOnlyBuffer（）方法及其示例-yiteyi-C++库

这个 asReadOnlyBuffer（） 方法 JAVA尼奥。短缓冲区 类用于使用此缓冲区的内容创建新的只读短缓冲区。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。

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由于新缓冲区是只读的，因此不允许对其内容进行任何修改。两个缓冲器的位置、极限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的相同。如果此缓冲区本身是只读的，则此方法的行为方式与复制方法完全相同。

语法 :

public abstract ShortBuffer asReadOnlyBuffer()

返回值 ：此方法返回新的， 只读短缓冲区 与此缓冲区的内容相同。

下面是一些例子来说明 asReadOnlyBuffer（） 方法：

方案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(                               "ReadOnlyBuffer 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,

方案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(                               "ShortBuffer 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(                               "ReadOnlyBuffer FloatBuffer: "                               );                   
                             
                                         while                               (readOnlySb.hasRemaining())                   
                                         System.out.print(readOnlySb.get() +                               ", "                               );                   
                             
                                         // try to change readOnlySb                   
                                         System.out.println(                               "Trying 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

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