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📜  Java中的 CopyOnWriteArraySet remove() 方法

📅  最后修改于: 2022-05-13 01:55:13.852000             🧑  作者: Mango

Java中的 CopyOnWriteArraySet remove() 方法

CopyOnWriteArraySetremove()方法会移除指定元素(如果它存在于集合中)。

句法:

public boolean remove(Object o)

参数:该函数接受一个强制参数o ,它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

下面的程序说明了上述函数:

方案一:

// 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 ArrSet
            = new CopyOnWriteArraySet();
  
        // 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]

方案二:

// 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 ArrSet
            = new CopyOnWriteArraySet();
  
        // 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: Java/util/concurrent/CopyOnWriteArraySet.html#remove-java.lang.Object-