Java LinkedBlockingDeque removeIf()用法及代碼示例

LinkedBlockingDeque的removeIf()方法從此LinkedBlockingDeque中刪除滿足指定條件的元素。

用法:

public boolean removeIf (Predicate<? super E> filter)

參數：此方法接受強製性參數過濾器，該過濾器是基於從此雙端隊列中刪除哪些元素的謂詞值。

返回值：如果更改了LinkedBlockingDeque，則此方法返回布爾值，例如true。否則，此方法返回false。

異常：如果指定的謂詞過濾器為null，則此方法將引發NullPointerException。

以下示例程序旨在說明LinkedBlockingDeque類的removeIf()函數：

示例1:

// Java Program Demonstrate removeIf() 
// 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.add(7855642); 
        LBD.add(35658786); 
        LBD.add(5278367); 
        LBD.add(74381793); 
  
        // Print Deque 
        System.out.println("Linked Blocking Deque: "
                           + LBD); 
  
        // If a number in the List is 
        // divisible by 3, then remove it 
        LBD.removeIf(number -> number % 3 == 0); 
  
        System.out.println("Linked Blocking Deque: "
                           + LBD); 
    } 
}

輸出：

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

示例2:

// Java Program Demonstrate removeIf() 
// 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.add(7855642); 
        LBD.add(35658786); 
        LBD.add(5278367); 
        LBD.add(74381793); 
  
        // Print Dequeue 
        System.out.println("Linked Blocking Deque: "
                           + LBD); 
  
        try { 
            // if the predicate is null, 
            // then it will throw NullPointerException 
            LBD.removeIf(null); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}

輸出：

Linked Blocking Deque: [7855642, 35658786, 5278367, 74381793]
java.lang.NullPointerException

參考： https://docs.oracle.com/javase/9/docs/api/java/util/concurrent/LinkedBlockingDeque.html#removeIf-java.util.function.Predicate-

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注：本文由純淨天空篩選整理自ProgrammerAnvesh大神的英文原創作品 LinkedBlockingDeque removeIf() 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。