Java中的缓冲区剩余（）方法与示例

Java.nio.Buffer 类的剩余()方法用于返回当前位置和限制之间的元素个数。

句法：

public final int remaining()

返回值：此方法返回此缓冲区中剩余的元素数。

以下是说明剩余（）方法的示例：

示例 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

示例 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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