Java Buffer isDirect()方法及示例

来源：这里教程网时间：2026-02-17 20:37:15 作者：

Java Buffer isDirect()方法及示例

java.nio.Buffer类 的 isDirect() 方法是用来告诉这个缓冲区是否是直接的。

语法

public abstract boolean isDirect()

返回值： 如果，而且只有当这个缓冲区是直接的，这个方法才会返回true。

下面是说明 isDirect() 方法的例子。

例子 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");    }}

输出:

buffer is direct

例子 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");    }}

输出: