Java LinkedBlockingDeque putLast()方法

LinkedBlockingDeque 的 putLast(E e) 方法将指定的元素插入到这个deque所代表的队列中（换句话说，在这个deque的尾部/末端）。如果该Deque有容量限制，那么它将等待空间的出现。

语法

public void putLast(E e)

参数： 该方法接受一个强制参数 e ，它是要插入到LinkedBlockingDeque末端的元素。

返回： 该方法不返回任何东西。

异常： 该程序抛出两个异常，如下所示。

• NullPointerException – 如果指定的元素是空的。
• InterruptedException – 如果在等待时被打断。

下面的程序说明了LinkedBlockingDeque的putLast()方法。

程序1 :

// Java Program Demonstrate putLast()
// method of LinkedBlockingDeque
  
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws InterruptedException
    {
  
        // create object of LinkedBlockingDeque
        LinkedBlockingDeque<Integer> LBD
            = new LinkedBlockingDeque<Integer>();
  
        // Add numbers to end of LinkedBlockingDeque
        LBD.putLast(7855642);
        LBD.putLast(35658786);
        LBD.putLast(5278367);
        LBD.putLast(74381793);
  
        // print Dequeue
        System.out.println("Linked Blocking Deque: " + LBD);
    }
}

输出:

Linked Blocking Deque: [7855642, 35658786, 5278367, 74381793]

示例2

// Java Program Demonstrate putLast()
// method of LinkedBlockingDeque
// throwing NullPointerException
  
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws InterruptedException
    {
  
        // create object of LinkedBlockingDeque
        LinkedBlockingDeque<Integer> LBD
            = new LinkedBlockingDeque<Integer>();
  
        // Add numbers to end of LinkedBlockingDeque
        LBD.putLast(7855642);
        LBD.putLast(35658786);
        LBD.putLast(5278367);
  
        // throws an exception
        LBD.putLast(null);
  
        // print Dequeue
        System.out.println("Linked Blocking Deque: " + LBD);
    }
}

输出:

Runtime Errors:
Exception in thread "main" java.lang.NullPointerException
    at java.util.concurrent.LinkedBlockingDeque.putLast(LinkedBlockingDeque.java:390)
    at GFG.main(GFG.java:23)

示例3

// Java Program Demonstrate putLast()
// method of LinkedBlockingDeque
// when capacity exceeded
  
import java.util.concurrent.LinkedBlockingDeque;
import java.util.*;
  
public class GFG {
    public static void main(String[] args)
        throws InterruptedException
    {
  
        // create object of LinkedBlockingDeque
        LinkedBlockingDeque<Integer> LBD
            = new LinkedBlockingDeque<Integer>(3);
  
        // Add numbers to end of LinkedBlockingDeque
        LBD.putLast(7855642);
        LBD.putLast(35658786);
        LBD.putLast(5278367);
  
        // throws an exception
        LBD.putLast(4356789);
  
        // print Dequeue
        System.out.println("Linked Blocking Deque: " + LBD);
    }
}

输出:

Runtime Errors:
Max real time limit exceeded due to either by heavy 
load on server or by using sleep function

参考资料: https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/LinkedBlockingDeque.html#putLast-E-