Java 中的 ConcurrentSkipListSet clear()方法

原文:https://www . geeksforgeeks . org/concurrentskiplistset-clear-method-in-Java/

java . util . concurrentSkiplistset . clear()方法是 Java 中的一个内置函数，它从这个集合中移除所有元素。

语法:

 ConcurrentSkipListSet.clear()

参数:函数不接受任何参数。

返回值:函数不返回任何内容。

下面的程序说明了 ConcurrentSkipListSet.clear()方法:

程序 1:

/* Java Program Demonstrate clear()
method of ConcurrentSkipListSet() */
import java.util.concurrent.*;
class ConcurrentSkipListSetClearExample1 {
    public static void main(String[] args)
    {
        // Creating a set object
        ConcurrentSkipListSet<Integer> Lset = 
                   new ConcurrentSkipListSet<Integer>();

        // Adding elements to this set
        for (int i = 10; i <= 50; i += 10)
            Lset.add(i);

        // Printing elements of the set
        System.out.println("The set contains: " + Lset);

        // Clear the set
        Lset.clear();

        // Printing elements of the set after clear operation
        System.out.println("After clear operation the set contains: " 
                                                             + Lset);
    }
}

输出:

The set contains: [10, 20, 30, 40, 50]
After clear operation the set contains: []

程序二:

/* Java Program Demonstrate clear()
method of ConcurrentSkipListSet() */
import java.util.concurrent.*;
class ConcurrentSkipListSetClearExample2 {
    public static void main(String[] args)
    {
        // Creating a set object
        ConcurrentSkipListSet<String> Lset = 
                    new ConcurrentSkipListSet<String>();

        // Adding elements to this set
        Lset.add("alex");
        Lset.add("bob");
        Lset.add("chuck");
        Lset.add("drake");
        Lset.add("eric");

        // Printing elements of the set
        System.out.println("The set contains: " + Lset);

        // Clear the set
        Lset.clear();

        // Printing elements of the set after clear operation
        System.out.println("After clear operation the set contains: " 
                                                              + Lset);
    }
}

输出:

The set contains: [alex, bob, chuck, drake, eric]
After clear operation the set contains: []

参考:https://docs . Oracle . com/javase/8/docs/API/Java/util/concurrentskiplistset . html # clear–

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