Java IntBuffer duplicate()用法及代碼示例

java.nio.IntBuffer類的duplicate()方法用於創建一個新的IntBuffer，它在所有方麵都相同地共享給定緩衝區的內容。

用法:

public abstract IntBuffer duplicate()

返回值：此方法返回新的IntBuffer，它攜帶以前的IntBuffer的內容

下麵是說明duplicate()方法的示例：

範例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"); 
        } 
    } 
}

輸出：

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

範例2：使用read-onlyintbuffer

// 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"); 
        } 
    } 
}

輸出：

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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