Java 中 BlockingDeque 元素()方法，带示例
原文:https://www . geeksforgeeks . org/blocking eque-element-method-in-Java-with-examples/
阻塞请求的元素()方法返回容器前面的元素。它不会删除容器中的元素。这个方法返回由这个 deque 表示的队列头。
语法:
public void element()
参数:此方法不接受任何参数。
返回:这个方法返回这个 deque 所代表的队列头。
注:blocking eque的 element()方法继承了 Java 中的link edblocking eque类。
下面的程序说明了阻塞请求的元素()方法:
程序 1:
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program Demonstrate element()
// method of BlockingDeque
import java.util.concurrent.LinkedBlockingDeque;
import java.util.concurrent.BlockingDeque;
import java.util.*;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of BlockingDeque
BlockingDeque<Integer> BD
= new LinkedBlockingDeque<Integer>();
// Add numbers to end of BlockingDeque
BD.add(10);
BD.add(20);
BD.add(30);
BD.add(40);
// before removing print Deque
System.out.println("Blocking Deque: " + BD);
System.out.println("Blocking Deque front element: " + BD.element());
}
}
Output:
Blocking Deque: [10, 20, 30, 40]
Blocking Deque front element: 10
程序 2:
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program Demonstrate element()
// method of BlockingDeque
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
import java.util.concurrent.BlockingDeque;
public class GFG {
public static void main(String[] args)
throws IllegalStateException
{
// create object of BlockingDeque
BlockingDeque<String> BD
= new LinkedBlockingDeque<String>();
// Add numbers to end of BlockingDeque
BD.add("ab");
BD.add("cd");
BD.add("fg");
BD.add("xz");
// before removing print Deque
System.out.println("Blocking Deque: " + BD);
System.out.println("Blocking Deque front element: " + BD.element());
}
}
Output:
Blocking Deque: [ab, cd, fg, xz]
Blocking Deque front element: ab
参考:https://docs . Oracle . com/javase/7/docs/API/Java/util/concurrent/blockingdequee . html # element()
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