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📜  Java中的 ByteBuffer isDirect() 方法及示例

📅  最后修改于: 2022-05-13 01:54:25.561000             🧑  作者: Mango

Java中的 ByteBuffer isDirect() 方法及示例

Java.nio.ByteBuffer 类isDirect()方法用于判断这个字节缓冲区是否是直接的。

句法:

public abstract boolean isDirect()

返回值:当且仅当此缓冲区是直接的时,此方法才返回 true。

下面是说明isDirect()方法的示例:

示例 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);
  
        // check the byteBuffer
        // using isDirect() method
        boolean val = byteBuffer.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

示例 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);
  
        // check the byteBuffer
        // using isDirect() method
        boolean val = byteBuffer.isDirect();
  
        // checking the condition
        if (val)
            System.out.println("buffer is direct");
        else
            System.out.println("buffer is not direct");
    }
}
输出:
buffer is not direct

参考: https://docs.oracle.com/javase/9/docs/api/ Java/nio/ByteBuffer.html#isDirect–