Java CopyOnWriteArraySet remove()方法

CopyOnWriteArraySet 的 remove() 方法可以删除指定的元素，如果该元素存在于集合中。

语法

public boolean remove(Object o)

参数： 该函数接受一个强制性参数 o ，该参数指定了要从集合中删除的元素（如果存在）。

返回值： 如果集合中包含指定的元素，则该函数返回true。

下面的程序说明了上述函数。

程序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]

程序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

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