java.nio.Buffer類的hasRemaining()方法用於判斷當前位置和限製之間是否有任何元素。
用法:
public final boolean hasRemaining()
返回值:當且僅當此緩衝區中至少剩餘一個元素時,此方法才會返回true。
下麵是說明hasRemaining()方法的示例:
範例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");
}
}
輸出:
there is at least one element remaining in this buffer
範例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");
}
}
輸出:
there is no element remaining in this buffer
參考: https://docs.oracle.com/javase/9/docs/api/java/nio/Buffer.html#hasRemaining-
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注:本文由純淨天空篩選整理自RohitPrasad3大神的英文原創作品 Buffer hasRemaining() methods in Java with Examples。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。