Java LinkedBlockingDeque push()用法及代碼示例

LinkedBlockingDeque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LinkedBlockingDeque受容量限製並且沒有剩餘空間可插入，則它返回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。

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LinkedBlockingDeque的push()方法：

示例1:

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

輸出：

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

示例2:

// Java Program Demonstrate push() 
// method of LinkedBlockingDeque 
// when it is Full 
import java.util.concurrent.LinkedBlockingDeque; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
        throws IllegalStateException 
    { 
  
        // create object of LinkedBlockingDeque 
        // size of list 
        LinkedBlockingDeque<Integer> LBD 
            = new LinkedBlockingDeque<Integer>(3); 
  
        // Add numbers to end of LinkedBlockingDeque 
        LBD.push(7855642); 
        LBD.push(35658786); 
        LBD.push(5278367); 
  
        // it is full 
        LBD.push(74381793); 
  
        // before removing print queue 
        System.out.println("Linked Blocking Deque: " + LBD); 
    } 
}

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:23)

示例3:

// Java Program Demonstrate push() 
// method of LinkedBlockingDeque 
// when null is inserted 
  
import java.util.concurrent.LinkedBlockingDeque; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
        throws IllegalStateException 
    { 
  
        // create object of LinkedBlockingDeque 
        LinkedBlockingDeque<Integer> LBD 
            = new LinkedBlockingDeque<Integer>(); 
  
        // Add numbers to end of LinkedBlockingDeque 
        LBD.push(7855642); 
        LBD.push(35658786); 
        LBD.push(5278367); 
  
        // NULL 
        LBD.push(null); 
  
        // before removing print queue 
        System.out.println("Linked Blocking Deque: " + LBD); 
    } 
}

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:23)

參考： https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/LinkedBlockingDeque.html#push(E)

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