Java interview programs

Java Programs

How to find Duplcate values in ArrayList with count

 
import java.util.ArrayList;
import java.util.HashMap;

public class CollectionsEx2 {

	public static void main(String[] args) {
		ArrayList list = new ArrayList();
        list.add("Sagio Mane");
        list.add("Karius");
        list.add("Mo Salah");
        list.add("Firmino");
        list.add("Lovren");
        list.add("Steven Gerrard");
        list.add("Karius");
        list.add("Mo Salah");
        list.add("Mo Salah");
        
    	HashMap hm = new HashMap();
		for(String i: list) {
			if (hm.containsKey(i)) hm.put(i, hm.get(i)+1);
			else hm.put(i, 1);
		}
		System.out.println("HashMap:" + hm);
	}
}
        
 Output: HashMap:{Firmino=1, Sagio Mane=1, Lovren=1, Karius=2, Steven Gerrard=1, Mo Salah=3}