Java中的 LinkedBlockingDeque putLast() 方法
LinkedBlockingDeque 的putLast (E e)方法将指定元素插入到此双端队列表示的队列中(换句话说,在此双端队列的尾部/末尾)。如果双端队列容量受限,那么它将等待空间可用。
句法:
public void putLast(E e)
参数:此方法接受一个强制参数e ,它是要插入到 LinkedBlockingDeque 末尾的元素。
返回:此方法不返回任何内容。
异常:程序抛出两个异常,如下所示:
- NullPointerException – 如果指定元素为 null
- InterruptedException – 如果在等待时被中断
下面的程序说明了 LinkedBlockingDeque 的 putLast() 方法:
方案一:
// 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 LBD
= new LinkedBlockingDeque();
// 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]
方案二:
// 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 LBD
= new LinkedBlockingDeque();
// 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)
方案 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 LBD
= new LinkedBlockingDeque(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: https: Java/util/concurrent/LinkedBlockingDeque.html#putLast-E-