Java中的IntBuffer duplicate（）方法及其示例-yiteyi-C++库

这个 重复（） 方法 JAVA尼奥。IntBuffer 类用于创建一个新的IntBuffer，该IntBuffer在所有方面都相同地共享给定缓冲区的内容。

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语法：

public abstract IntBuffer duplicate()

返回值： 此方法返回 新IntBuffer 它携带了前一个IntBuffer的内容

下面是一些例子来说明 重复（） 方法：

例1： 使用直接IntBuffer

                     // Java program to demonstrate duplicate() method                   
                             
                     import                               java.nio.*;                   
                     import                               java.util.*;                   
                             
                     public                               class                               GFG {                   
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                             
                                         // Declaring the capacity of the IntBuffer                   
                                         int                               capacity =                               10                               ;                   
                             
                                         // Creating the IntBuffer                   
                                         try                               {                   
                             
                                         // creating object of Intbuffer                   
                                         // and allocating size capacity                   
                                         IntBuffer ib1 = IntBuffer.allocate(capacity);                   
                             
                                         // putting the value in Intbuffer                   
                                         ib1.put(                               8                               );                   
                                         ib1.put(                               2                               ,                               9                               );                   
                                         ib1.rewind();                   
                             
                                         // print the Original IntBuffer                   
                                         System.out.println(                               "Original IntBuffer:  "                   
                                         + Arrays.toString(ib1.array()));                   
                             
                                         // Creating a duplicate copy of IntBuffer                   
                                         // using duplicate() method                   
                                         IntBuffer ib2 = ib1.duplicate();                   
                             
                                         // print the duplicate copy of IntBuffer                   
                                         System.out.print(                               "Duplicate IntBuffer: "                   
                                         + Arrays.toString(ib2.array()));                   
                                         }                   
                             
                                         catch                               (IllegalArgumentException e) {                   
                                         System.out.println(                               "IllegalArgumentException catched"                               );                   
                                         }                   
                             
                                         catch                               (ReadOnlyBufferException e) {                   
                                         System.out.println(                               "ReadOnlyBufferException catched"                               );                   
                                         }                   
                                         }                   
                     }                   

输出：

Original IntBuffer:  [8, 0, 9, 0, 0, 0, 0, 0, 0, 0]
Duplicate IntBuffer: [8, 0, 9, 0, 0, 0, 0, 0, 0, 0]

例2： 使用只读缓冲区

                     // Java program to demonstrate                   
                     // duplicate() method                   
                     // using read-onlyIntbuffer                   
                             
                     import                               java.nio.*;                   
                     import                               java.util.*;                   
                             
                     public                               class                               GFG {                   
                             
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                             
                                         // Declaring the capacity of the IntBuffer                   
                                         int                               capacity =                               10                               ;                   
                             
                                         // Creating the IntBuffer                   
                                         try                               {                   
                             
                                         // creating object of Intbuffer                   
                                         // and allocating size capacity                   
                                         IntBuffer ib1 = IntBuffer.allocate(capacity);                   
                             
                                         // putting the value in Intbuffer                   
                                         ib1.put(                               8                               );                   
                                         ib1.put(                               2                               ,                               9                               );                   
                                         ib1.rewind();                   
                             
                                         // print the Original IntBuffer                   
                                         System.out.println(                               "Original IntBuffer:  "                   
                                         + Arrays.toString(ib1.array()));                   
                             
                                         // Creating a read-only copy of IntBuffer                   
                                         // using asReadOnlyBuffer() method                   
                                         IntBuffer readonly = ib1.asReadOnlyBuffer();                   
                             
                                         // print the read-only copy of IntBuffer                   
                                         System.out.print(                               "read-only IntBuffer:  "                               );                   
                             
                                         while                               (Readonly.hasRemaining())                   
                                         System.out.print(readonly.get() +                               ", "                               );                   
                             
                                         System.out.println(                               ""                               );                   
                             
                                         // Rewinding the readonly IntBuffer                   
                                         readonly.rewind();                   
                             
                                         // Creating a duplicate copy of IntBuffer                   
                                         // using duplicate() method                   
                                         IntBuffer ib2 = readonly.duplicate();                   
                             
                                         // print the duplicate copy of IntBuffer                   
                                         System.out.print(                               "Duplicate copy of read-only IntBuffer:  "                               );                   
                             
                                         while                               (ib2.hasRemaining())                   
                                         System.out.print(ib2.get() +                               ", "                               );                   
                             
                                         System.out.println(                               ""                               );                   
                                         }                   
                             
                                         catch                               (IllegalArgumentException e) {                   
                                         System.out.println(                               "IllegalArgumentException catched"                               );                   
                                         }                   
                             
                                         catch                               (ReadOnlyBufferException e) {                   
                                         System.out.println(                               "ReadOnlyBufferException catched"                               );                   
                                         }                   
                                         }                   
                     }                   

输出：

Original IntBuffer:  [8, 0, 9, 0, 0, 0, 0, 0, 0, 0]
Read-only IntBuffer:  8, 0, 9, 0, 0, 0, 0, 0, 0, 0, 
Duplicate copy of read-only IntBuffer:  8, 0, 9, 0, 0, 0, 0, 0, 0, 0,

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