Java 中的缓冲区剩余()方法，示例
原文:https://www . geesforgeks . org/buffer-has resisting-methods-in-Java-with-examples/
java.nio.Buffer 类的has resisting()方法用来判断当前位置和极限之间是否有元素。
语法:
public final boolean hasRemaining()
返回:当且仅当该缓冲区中至少还有一个元素剩余时，该方法将返回 true 。
以下是说明has resisting()方法的示例:
示例 1:
// Java program to demonstrate
// hasRemaining() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 10;
// creating object of bytebuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// putting the value in bytebuffer
bb.put((byte)10);
bb.put((byte)20);
bb.rewind();
// Typecast bytebuffer to Buffer
Buffer buffer = (Buffer)bb;
// checking buffer is backed by array or not
boolean isRemain = buffer.hasRemaining();
// checking if else condition
if (isRemain)
System.out.println("there is at least one "
+ "element remaining "
+ "in this buffer");
else
System.out.println("there is no "
+ "element remaining "
+ "in this buffer");
}
}
输出:
there is at least one element remaining in this buffer
示例 2:
// Java program to demonstrate
// hasRemaining() method
import java.nio.*;
import java.util.*;
public class GFG {
public static void main(String[] args)
{
// Declaring the capacity of the ByteBuffer
int capacity = 0;
// creating object of bytebuffer
// and allocating size capacity
ByteBuffer bb = ByteBuffer.allocate(capacity);
// Typecast bytebuffer to Buffer
Buffer buffer = (Buffer)bb;
// checking buffer is backed by array or not
boolean isRemain = buffer.hasRemaining();
// checking if else condition
if (isRemain)
System.out.println("there is at least one "
+ "element remaining"
+ " in this buffer");
else
System.out.println("there is no "
+ "element remaining"
+ " in this buffer");
}
}
输出:
there is no element remaining in this buffer
参考:https://docs . Oracle . com/javase/9/docs/API/Java/nio/buffer . html # has resisting–
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