Java中的DelayQueue类的put(E ele)方法用于将给定元素插入延迟队列容器。 Hetre,E是此DelayQueue容器维护的元素的类型。
句法:
public void put(E ele)
参数:此方法仅接受一个参数ele。这是将插入延迟队列的元素。
返回值:该方法的返回类型为void,并且不返回任何值。
异常:
- NullPointerException :如果给定值为null,则抛出该异常。
以下示例程序旨在说明Java中DelayQueue的put()方法:
程序1:
// Java program to illustrate the put()
// method in Java
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 DelayQueue instance
DelayQueue<Delayed> queue = new DelayQueue<Delayed>();
// Initially Delay Queue is empty
System.out.println("Before calling put() : "
+ queue.isEmpty());
// Cerate an object of type Delayed
Delayed ele = 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 created object to DelayQueue
// using the put() method
queue.put(ele);
// Check if DelayQueue is empty.
System.out.println("After calling put() : "
+ queue.isEmpty());
}
}
输出:
Before calling put() : true After calling put() : false
程序2:演示NullPointerException。
// Java program to illustrate the Exception thrown
// by put() method of DelayQueue
import java.util.concurrent.DelayQueue;
import java.util.concurrent.Delayed;
import java.util.concurrent.TimeUnit;
public class GFG {
public static void main(String args[])
{
DelayQueue<Delayed> queue = new DelayQueue<Delayed>();
try {
queue.put(null);
}
catch (Exception e) {
System.out.println(e);
}
}
}
输出:
java.lang.NullPointerException
参考: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/DelayQueue.html#put(E)
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注:本文由纯净天空筛选整理自psil123大神的英文原创作品 DelayQueue put() 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。