Java CopyOnWriteArraySet removeIf()用法及代碼示例

CopyonWriteArraySet方法的removeIf()方法從此CopyOnWriteArraySet中移除滿足指定條件的元素。

用法:

public boolean removeIf (Predicate<E> filter)

參數：此方法接受強製性參數過濾器，該過濾器是基於從該集合中刪除哪些元素的謂詞值。

返回值：如果CopyOnWriteArraySet更改，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CopyOnWriteArrayList類的removeIf()函數：

示例1:

// Java Program to illustrate the CopyOnWriteArraySet 
// removeIf() method in Java 
  
import java.util.concurrent.CopyOnWriteArraySet; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create object of CopyOnWriteArraySet 
        CopyOnWriteArraySet<Integer> ArrSet 
            = new CopyOnWriteArraySet<Integer>(); 
  
        // Add elements 
        ArrSet.add(10); 
        ArrSet.add(20); 
        ArrSet.add(30); 
        ArrSet.add(40); 
        ArrSet.add(50); 
        ArrSet.add(60); 
        ArrSet.add(70); 
        ArrSet.add(80); 
        ArrSet.add(90); 
  
        // print CopyOnWriteArraySet 
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet); 
  
        // if a number in the set is 
        // divisible by 3, then remove it 
        ArrSet.removeIf(number -> number % 3 == 0); 
  
        // print updated CopyOnWriteArraySet 
        System.out.println("Updated CopyOnWriteArraySet: "
                           + ArrSet); 
    } 
}

輸出：

CopyOnWriteArraySet: [10, 20, 30, 40, 50, 60, 70, 80, 90]
Updated CopyOnWriteArraySet: [10, 20, 40, 50, 70, 80]

示例2:

// Java Program to illustrate the CopyOnWriteArraySet 
// removeIf() method in Java 
  
import java.util.concurrent.CopyOnWriteArraySet; 
import java.util.*; 
  
public class GFG { 
    public static void main(String[] args) 
    { 
  
        // create object of CopyOnWriteArraySet 
        CopyOnWriteArraySet<String> ArrSet 
            = new CopyOnWriteArraySet<String>(); 
  
        // Add elements 
        ArrSet.add("GeeksforGeeks"); 
        ArrSet.add("GFG"); 
        ArrSet.add("Geeks"); 
        ArrSet.add("Gfg"); 
  
        // print CopyOnWriteArraySet 
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet); 
  
        try { 
  
            // if a number in the set is 
            // divisible by 3, then remove it 
            // This will throw NullPointerException 
            ArrSet.removeIf(null); 
        } 
        catch (Exception e) { 
            System.out.println(e); 
        } 
    } 
}

輸出：

CopyOnWriteArraySet: [GeeksforGeeks, GFG, Geeks, Gfg]
java.lang.NullPointerException

相關用法

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