Java Buffer remaining()方法及示例

java.nio.Buffer类 的 remain() 方法用于返回当前位置和极限之间的元素数量。

语法

public final int remaining()

返回值： 该方法返回该缓冲区中剩余的元素数量。

下面是说明restaining()方法的例子。

例子 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

例子 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: