Java中的LongBuffer duplicate（）方法-yiteyi-C++库

这个 重复（） 方法 JAVA尼奥。长缓冲区 类用于创建新的 长缓冲区 共享给定缓冲区的内容。

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语法：

public abstract LongBuffer duplicate()

返回值： 此方法返回 新长缓冲区 它承载了之前的长缓冲区内容

下面是一些例子来说明 重复（） 方法：

例1： 使用直接长缓冲区

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

输出：

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

例2： 使用只读长缓冲区

                     // Java program to demonstrate                   
                     // duplicate() method                   
                     // using read-onlyLongbuffer                   
                             
                     import                               java.nio.*;                   
                     import                               java.util.*;                   
                             
                     public                               class                               GFG {                   
                             
                                         public                               static                               void                               main(String[] args)                   
                                         {                   
                             
                                         // Declaring the capacity of the LongBuffer                   
                                         int                               capacity =                               10                               ;                   
                             
                                         // Creating the LongBuffer                   
                                         try                               {                   
                             
                                         // creating object of Longbuffer                   
                                         // and allocating size capacity                   
                                         LongBuffer ib1 = LongBuffer.allocate(capacity);                   
                             
                                         // putting the value in Longbuffer                   
                                         ib1.put(                               8                               );                   
                                         ib1.put(                               2                               ,                               9                               );                   
                                         ib1.rewind();                   
                             
                                         // prLong the Original LongBuffer                   
                                         System.out.println(                               "Original LongBuffer:  "                   
                                         + Arrays.toString(ib1.array()));                   
                             
                                         // Creating a read-only copy of LongBuffer                   
                                         // using asReadOnlyBuffer() method                   
                                         LongBuffer readonly = ib1.asReadOnlyBuffer();                   
                             
                                         // prLong the read-only copy of LongBuffer                   
                                         System.out.print(                               "read-only LongBuffer:  "                               );                   
                                         while                               (readonly.hasRemaining())                   
                                         System.out.print(readonly.get() +                               ", "                               );                   
                                         System.out.println(                               ""                               );                   
                             
                                         // Rewinding the readonly LongBuffer                   
                                         readonly.rewind();                   
                             
                                         // Creating a duplicate copy of LongBuffer                   
                                         // using duplicate() method                   
                                         LongBuffer ib2 = readonly.duplicate();                   
                             
                                         // prLong the duplicate copy of LongBuffer                   
                                         System.out.print(                               "duplicate copy of read-only LongBuffer:  "                               );                   
                             
                                         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 LongBuffer:  [8, 0, 9, 0, 0, 0, 0, 0, 0, 0]
read-only LongBuffer:  8, 0, 9, 0, 0, 0, 0, 0, 0, 0, 
duplicate copy of read-only LongBuffer:  8, 0, 9, 0, 0, 0, 0, 0, 0, 0,

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