java.nio.Buffer類的isDirect()方法用于判斷此緩沖區是否是直接緩沖區。

用法:

public abstract boolean isDirect()

返回值：當且僅當此緩沖區是直接緩沖區時，此方法才返回true。

下面是說明isDirect()方法的示例：

范例1：

// Java program to demonstrate

// isDirect() method

import java.nio.*;

import java.util.*;

public class GFG {

public static void main(String[] args)

{

// defining and allocating ByteBuffer

// using allocate() method

ByteBuffer byteBuffer

= ByteBuffer.allocateDirect(4);

// Typecast byteBuffer to buffer

Buffer buffer = (Buffer)byteBuffer;

// check the Buffer

// using isDirect() method

boolean val = buffer.isDirect();

// checking the condition

if (val)

System.out.println("buffer is direct");

else

System.out.println("buffer is not direct");

}

}

輸出：

buffer is direct

范例2：

// Java program to demonstrate

// isDirect() method

import java.nio.*;

import java.util.*;

public class GFG {

public static void main(String[] args)

{

// defining and allocating ByteBuffer

// using allocate() method

ByteBuffer byteBuffer = ByteBuffer.allocate(4);

// Typecast byteBuffer to buffer

Buffer buffer = (Buffer)byteBuffer;

// check the byteBuffer

// using isDirect() method

boolean val = buffer.isDirect();

// checking the condition

if (val)

System.out.println("buffer is direct");

else

System.out.println("buffer is not direct");

}

}

輸出：

buffer is not direct

總結

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