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arraylist.removeAll(Collection c);

import java.util.ArrayList;

class Main {
    public static void main(String[] args){

        // Create an array
        ArrayList<String> sites = new ArrayList<>();

        sites.add("Google");
        sites.add("tutorialpro");
        sites.add("Taobao");
        System.out.println("Website List: " + sites);

        // Remove all elements
        sites.removeAll(sites);
        System.out.println("After using removeAll() method: " + sites);
    }
}

Website List: [Google, tutorialpro, Taobao]
After using removeAll() method: []

sites.removeAll(sites);