Java 中 BlockingDeque offerFirst()方法，带示例
原文:https://www . geeksforgeeks . org/blocking eque-offer first-method-in-Java-with-examples/
提供阻塞请求的 First(E e) 方法，将参数中传递的元素插入到 Deque 容器的前面。如果容器的容量已经超出，那么它不会像 add()和 addFirst()函数那样返回异常。
语法:
public boolean offerFirst(E e)
参数:该方法接受一个强制参数 e ，它是要插入到阻塞请求前面的元素。
返回:这个方法返回真如果元素已经插入，否则返回假。
注:blocking eque的 offerFirst()方法继承自 Java 中的link edblocking eque类。
下面的程序说明了链接锁定请求的 offerFirst()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 offerFirst()
// 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>(4);
// Add numbers to end of BlockingDeque
BD.offerFirst(7855642);
BD.offerFirst(35658786);
BD.offerFirst(5278367);
BD.offerFirst(74381793);
// Cannot be inserted
BD.offerFirst(10);
// cannot be inserted hence returns false
if (!BD.offerFirst(10))
System.out.println("The element 10 cannot be inserted"
+ " as capacity is full");
// before removing print queue
System.out.println("Blocking Deque: " + BD);
}
}
Output:
The element 10 cannot be inserted as capacity is full
Blocking Deque: [74381793, 5278367, 35658786, 7855642]
程序 2:
Java 语言(一种计算机语言，尤用于创建网站)
// Java Program Demonstrate offerFirst()
// 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<String> BD
= new LinkedBlockingDeque<String>(4);
// Add numbers to end of BlockingDeque
BD.offerFirst("abc");
BD.offerFirst("gopu");
BD.offerFirst("geeks");
BD.offerFirst("richik");
// Cannot be inserted
BD.offerFirst("hii");
// cannot be inserted hence returns false
if (!BD.offerFirst("hii"))
System.out.println("The element 'hii' cannot be"
+ " inserted as capacity is full");
// before removing print queue
System.out.println("Blocking Deque: " + BD);
}
}
Output:
The element 'hii' cannot be inserted as capacity is full
Blocking Deque: [richik, geeks, gopu, abc]
版权属于：月萌API www.moonapi.com，转载请注明出处
