BlockingDeque的push(E e)方法將元素壓入此雙端隊列表示的堆棧上。如果有空間,它將在參數中傳遞的元素插入到雙端隊列的前麵。如果BlockingDeque受容量限製並且沒有剩餘空間可插入,則它將返回IllegalStateException。此函數類似於addFirst()。
用法:
public void push(E e)
參數:此方法接受強製參數e,該參數是要在LinkedBlockingDeque的前麵插入的元素。
注意:BlockingDeque的push()方法已從Java中的LinkedBlockingDeque類繼承。
返回值:此方法不返回任何內容。
異常:
- IllegalStateException:如果由於容量限製此時無法添加元素
- NullPointerException :如果指定的元素為null
以下示例程序旨在說明BlockingDeque的push()方法:
示例1:
// Java Program Demonstrate push()
// 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>();
// Add numbers to end of dBlockingDeque
BD.push(7855642);
BD.push(35658786);
BD.push(5278367);
BD.push(74381793);
// before removing print queue
System.out.println("Blocking Deque: " + BD);
}
}
輸出:
Blocking Deque: [74381793, 5278367, 35658786, 7855642]
示例2:
// Java Program Demonstrate push()
// method of BlockingDeque
// when it is Full
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
// size of list
BlockingDeque<Integer> LBD
= new LinkedBlockingDeque<Integer>(3);
// Add numbers to end of BlockingDeque
BD.push(7855642);
BD.push(35658786);
BD.push(5278367);
// it is full
BD.push(74381793);
// before removing print queue
System.out.println("Blocking Deque: " + BD);
}
}
輸出:
Exception in thread "main" java.lang.IllegalStateException: Deque full at java.util.concurrent.LinkedBlockingDeque.addFirst(LinkedBlockingDeque.java:326) at java.util.concurrent.LinkedBlockingDeque.push(LinkedBlockingDeque.java:770) at GFG.main(GFG.java:24)
示例3:
// Java Program Demonstrate push()
// method of BlockingDeque
// when null is inserted
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>();
// Add numbers to end of BlockingDeque
BD.push(7855642);
BD.push(35658786);
BD.push(5278367);
// NULL
BD.push(null);
// before removing print Deque
System.out.println("Blocking Deque: " + BD);
}
}
輸出:
Exception in thread "main" java.lang.NullPointerException at java.util.concurrent.LinkedBlockingDeque.offerFirst(LinkedBlockingDeque.java:342) at java.util.concurrent.LinkedBlockingDeque.addFirst(LinkedBlockingDeque.java:325) at java.util.concurrent.LinkedBlockingDeque.push(LinkedBlockingDeque.java:770) at GFG.main(GFG.java:24)
參考: https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/BlockingDeque.html#push(E)
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注:本文由純淨天空篩選整理自gopaldave大神的英文原創作品 BlockingDeque push() method in Java with examples。非經特殊聲明,原始代碼版權歸原作者所有,本譯文未經允許或授權,請勿轉載或複製。