Java 中的缓冲剩余()方法，示例
原文:https://www . geesforgeks . org/buffer-restrict-methods-in-Java-with-examples/
Java . nio . buffer Class的(剩余)方法用于返回当前位置与极限之间的元素个数。
语法:
public final int remaining()
返回值:这个方法返回这个缓冲区中剩余的元素数量。
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 #剩余–
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