Java中的 BlockingDeque offerLast() 方法及示例
BlockingDeque的offerLast(E e)方法将参数中传入的元素插入到 Deque 容器的末尾。如果容器的容量已超出,则它不会像 add() 和 addLast()函数那样返回异常。
句法:
public boolean offerLast(E e)
参数:此方法接受一个强制参数e ,它是要插入到 BlockingDeque 末尾的元素。
返回:如果元素已被插入,此方法返回true ,否则返回false。
注意: BlockingDeque的 offerLast() 方法继承自Java中的 LinkedBlockingDeque 类。
下面的程序说明了 BlockingDeque 的 offerLast() 方法:
方案一:
// Java Program Demonstrate offerLast()
// 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 BD
= new LinkedBlockingDeque(4);
// Add numbers to end of BlockingDeque
BD.offerLast(7855642);
BD.offerLast(35658786);
BD.offerLast(5278367);
BD.offerLast(74381793);
// Cannot be inserted
BD.offerLast(10);
// cannot be inserted hence returns false
if (!BD.offerLast(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]
方案二:
// Java Program Demonstrate offerLast()
// 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 BD
= new LinkedBlockingDeque(4);
// Add numbers to end of BlockingDeque
BD.offerLast("abc");
BD.offerLast("gopu");
BD.offerLast("geeks");
BD.offerLast("richik");
// Cannot be inserted
BD.offerLast("hii");
// cannot be inserted hence returns false
if (!BD.offerLast("hii"))
System.out.println("The element 'hii' cannot be"
+ " inserted as capacity is full");
// before removing print queue
System.out.println("Blocking Deque: " + BD);
}
}
输出:
The element 'hii' cannot be inserted as capacity is full
Blocking Deque: [abc, gopu, geeks, richik]
参考: https: Java/util/concurrent/BlockingDeque.html#offerLast(E)