Java Buffer remaining()用法及代码示例

java.nio.Buffer类的remaining()方法用于返回当前位置和限制之间的元素数。

用法:

public final int remaining()

返回值：此方法返回此缓冲区中剩余的元素数。

下面是说明remaining()方法的示例：

范例1：

// Java program to demonstrate 
// remaining() method 
  
import java.nio.*; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // Declare and initialize the byte array 
        byte[] bb = { 10, 20, 30 }; 
  
        // wrap the byte array into ByteBuffer 
        // using wrap() method 
        ByteBuffer byteBuffer = ByteBuffer.wrap(bb); 
  
        // Typecast ByteBuffer to Buffer 
        Buffer buffer = (Buffer)byteBuffer; 
  
        // get the number of element present in the Buffer 
        // using remaining() method 
        int element = buffer.remaining(); 
  
        // print the buffer 
        System.out.println("Remaining element in buffer:"
                           + element); 
    } 
}

输出：

Remaining element in buffer:3

范例2：

// Java program to demonstrate 
// remaining() 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(7); 
  
        // put byte value in byteBuffer 
        // using put() method 
        byteBuffer.put((byte)20); // 1 byte space required 
        byteBuffer.put((byte)30); // 1 byte space required 
        byteBuffer.putInt(40); // 4 byte space required 
  
        // Typecast ByteBuffer to Buffer 
        Buffer buffer = (Buffer)byteBuffer; 
  
        // get the number of element present in the Buffer 
        // using remaining() method 
        int element = buffer.remaining(); 
  
        // print the buffer 
        System.out.println("Remaining element in buffer:"
                           + element); 
    } 
}

输出：

Remaining element in buffer:1

参考： https://docs.oracle.com/javase/9/docs/api/java/nio/Buffer.html#remaining-

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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 remaining() 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。