java.nio.Buffer类的hasRemaining()方法用于判断当前位置和限制之间是否有任何元素。
用法:
public final boolean hasRemaining()
返回值:当且仅当此缓冲区中至少剩余一个元素时,此方法才会返回true。
下面是说明hasRemaining()方法的示例:
范例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
范例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#hasRemaining-
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注:本文由纯净天空筛选整理自RohitPrasad3大神的英文原创作品 Buffer hasRemaining() methods in Java with Examples。非经特殊声明,原始代码版权归原作者所有,本译文未经允许或授权,请勿转载或复制。