Java CopyOnWriteArraySet remove()用法及代碼示例

CopyOnWriteArraySet的remove()方法將刪除指定的元素(如果該元素存在於集合中)。

用法:

public boolean remove(Object o)

參數：該函數接受強製性參數o，該參數指定要從集合中刪除的元素(如果存在)。

返回值：如果set包含指定的元素，則該函數返回true。

以下示例程序旨在說明上述函數：

示例1:

// Java Program to illustrate the 
// remove() 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(32); 
        ArrSet.add(67); 
        ArrSet.add(98); 
        ArrSet.add(100); 
  
        // print CopyOnWriteArraySet 
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet); 
  
        // Remove using remove() function 
        if (ArrSet.remove(100)) 
            System.out.println("Set after removal"
                               + " of 100 is: "
                               + ArrSet); 
        else
            System.out.println("100 is not present"); 
    } 
}

輸出：

CopyOnWriteArraySet: [32, 67, 98, 100]
Set after removal of 100 is: [32, 67, 98]

示例2:

// Java Program to illustrate the 
// isEmpty() 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("gopal"); 
        ArrSet.add("geeks"); 
        ArrSet.add("geeks"); 
        ArrSet.add("technical"); 
  
        // print CopyOnWriteArraySet 
        System.out.println("CopyOnWriteArraySet: "
                           + ArrSet); 
  
        // Remove using remove() function 
        if (ArrSet.remove("scripter")) 
            System.out.println("Set after removal"
                               + " of 'scripter' is: "
                               + ArrSet); 
        else
            System.out.println("'scripter' is not present"); 
    } 
}

輸出：

CopyOnWriteArraySet: [gopal, geeks, technical]
'scripter' is not present

參考： https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/CopyOnWriteArraySet.html#remove-java.lang.Object-

相關用法

注：本文由純淨天空篩選整理自gopaldave大神的英文原創作品 CopyOnWriteArraySet remove() method in Java。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。