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");
    }
}