Java 中的缓冲区是直接()方法，示例
原文:https://www . geesforgeks . org/buffer-is direct-methods-in-Java-with-examples/
java.nio.Buffer 类 的 isDirect() 方法用来判断这个缓冲区是否是直接的。
语法:
public abstract boolean isDirect()
返回值:当且仅当该缓冲区是直接的时，该方法返回真。
以下是说明是直接()方法的例子:
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);
// 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
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);
// 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:
buffer is not direct
参考:https://docs . Oracle . com/javase/9/docs/API/Java/nio/buffer . html # isDirect–
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