Object-Oriented Programming with Java, part I – Exercise 71

This program uses the method smart combine to only add non existing numbers to the list.

My Code

import java.util.ArrayList;
import java.util.Collections;

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

        ArrayList<Integer> list1 = new ArrayList<Integer>();
        ArrayList<Integer> list2 = new ArrayList<Integer>();

        Collections.addAll(list1, 4, 3);

        Collections.addAll(list2, 5, 10, 4, 3, 7);

        // remove comment when method ready
        smartCombine(list1, list2);
        System.out.println(list1);
        System.out.println(list2);
    }
    
    public static void smartCombine(ArrayList<Integer> list1, ArrayList<Integer> list2){
        
        for (int num : list2){
            if (!list1.contains(num)){
                list1.add(num);
            }
        }
    }

}

Model Code

import java.util.ArrayList;

import java.util.Collections;

 

public class SmartCombining {

    public static void main(String[] args) {

 

        ArrayList<Integer> list1 = new ArrayList<Integer>();

        ArrayList<Integer> list2 = new ArrayList<Integer>();

 

        Collections.addAll(list1, 4, 3);

 

        Collections.addAll(list2, 5, 10, 4, 3, 7);

 

        // remove comment when method ready

        //smartCombine(list1, list2);

        System.out.println(list1);

        System.out.println(list2);

    }

 

    public static void smartCombine(ArrayList<Integer> list1, ArrayList<Integer> list2) {

        for (Integer number : list2) {

            if (!list1.contains(number)) {

                list1.add(number);

            }

        }

    }

}

Comments

Almost exactly the same.