Java DelayQueue size()用法及代码示例

Java中的DelayQueue类的size()方法用于返回给定队列中存在的元素数。如果元素数大于Integer.MAX_VALUE，则返回Integer.MAX_VALUE作为此DelayQueue的大小。

句法：

public int size()

参数：它不接受任何参数。

返回值：它返回一个整数，它是队列的长度。

以下示例程序旨在说明Java中DelayQueue的size()方法：

// Java program to illutrate the size() method 
// of DelayQueue class 
  
import java.util.concurrent.DelayQueue; 
import java.util.concurrent.Delayed; 
import java.util.concurrent.TimeUnit; 
  
public class GFG { 
    public static void main(String args[]) 
    { 
        // Create a DelayQueue Instance 
        DelayQueue<Delayed> queue = new DelayQueue<Delayed>(); 
  
        // Create an object of type Delayed 
        Delayed obj = new Delayed() { 
  
            public long getDelay(TimeUnit unit) 
            { 
                return 24; // some value is returned 
            } 
  
            public int compareTo(Delayed o) 
            { 
                if (o.getDelay(TimeUnit.DAYS) >  
                           this.getDelay(TimeUnit.DAYS)) 
                    return 1; 
                else if (o.getDelay(TimeUnit.DAYS) ==  
                           this.getDelay(TimeUnit.DAYS)) 
                    return 0; 
                return -1; 
            } 
        }; 
  
        // Insert the object to this DelayQueue 
        // Size of the queue after insertion will be 1 
        queue.add(obj); 
  
        // print the size of this DelayQueue using 
        // size() method 
        System.out.println("Size : " + queue.size()); 
    } 
}

输出：

Size : 1

相关用法

注：本文由纯净天空筛选整理自psil123大神的英文原创作品 DelayQueue size() method 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。