Java CopyOnWriteArraySet remove()用法及代码示例

CopyOnWriteArraySet的remove()方法将删除指定的元素(如果该元素存在于集合中)。

用法:

public boolean remove(Object o)

参数：该函数接受强制性参数o，该参数指定要从集合中删除的元素(如果存在)。

返回值：如果set包含指定的元素，则该函数返回true。

以下示例程序旨在说明上述函数：

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"); 
    } 
}

输出：

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"); 
    } 
}

输出：

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

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

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注：本文由纯净天空筛选整理自gopaldave大神的英文原创作品 CopyOnWriteArraySet remove() method in Java。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。