BlockingDeque的offer(E e)方法将参数中传递的元素插入到Deque的末尾。如果超出了容器的容量,则不会像add()和addFirst()函数一样返回异常。
用法:
public boolean offer(E e)
参数:此方法接受强制参数e,该参数是要在BlockingDeque末尾插入的元素。
返回:如果已插入元素,则此方法返回true,否则返回false。
注意:: BlockingDeque的offer()方法已从Java中的LinkedBlockingDeque类继承。
以下示例程序旨在说明BlockingDeque的offer()方法:
程序1:
// Java Program Demonstrate offer()
// 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.offer(7855642);
BD.offer(35658786);
BD.offer(5278367);
BD.offer(74381793);
// Cannot be inserted
BD.offer(10);
// cannot be inserted hence returns false
if (!BD.offer(10))
System.out.println("The element 10 cannot be inserted"
+ " as capacity is full");
// before removing print queue
System.out.println("Blocking Deque:" + BD);
}
}
输出:
The element 10 cannot be inserted as capacity is full Blocking Deque:[7855642, 35658786, 5278367, 74381793]
程序2:
// Java Program Demonstrate offer()
// 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.offer("abc");
BD.offer("gopu");
BD.offer("geeks");
BD.offer("richik");
// Cannot be inserted
BD.offer("hii");
// cannot be inserted hence returns false
if (!BD.offer("hii"))
System.out.println("The element 'hii' cannot be inserted"
+ " as capacity is full");
// before removing print queue
System.out.println("Linked Blocking Deque:" + BD);
}
}
输出:
The element 'hii' cannot be inserted as capacity is full Blocking Deque:[abc, gopu, geeks, richik]
参考: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#offer(E)
相关用法
- Java BlockingDeque putLast()用法及代码示例
- Java BlockingDeque add()用法及代码示例
- Java BlockingDeque contains()用法及代码示例
- Java BlockingDeque take()用法及代码示例
- Java BlockingDeque put()用法及代码示例
- Java BlockingDeque addLast()用法及代码示例
- Java BlockingDeque addFirst()用法及代码示例
- Java BlockingDeque iterator()用法及代码示例
- Java BlockingDeque pollFirst()用法及代码示例
- Java BlockingDeque pollLast()用法及代码示例
- Java BlockingDeque push()用法及代码示例
- Java BlockingDeque offerLast()用法及代码示例
- Java BlockingDeque element()用法及代码示例
- Java BlockingDeque offerFirst()用法及代码示例
- Java BlockingDeque poll()用法及代码示例
注:本文由纯净天空筛选整理自gopaldave大神的英文原创作品 BlockingDeque offer() function 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。