java.nio.IntBuffer類的duplicate()方法用于創建一個新的IntBuffer，它在所有方面都相同地共享給定緩沖區的內容。

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

下面是說明duplicate()方法的示例：

范例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]

范例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,

總結

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