Question

Help me write a program to fit this template in Java.

public class GetNegatives {

/**
* Returns all the negative values in the given collection.
*/
public static Collection getNegatives(Collection collection) {
ArrayList result = new ArrayList<>();

}
}

Answer 1

import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;

public class GetNegatives {

    /**
     * Returns all the negative values in the given collection.
     */
    public static Collection getNegatives(Collection collection) {
        ArrayList result = new ArrayList<>();
        int num;
        Iterator<Integer> iterator = collection.iterator();
        while (iterator.hasNext()) {
            num = iterator.next();
            if(num < 0) {
                result.add(num);
            }
        }
        return result;
    }

    public static void main(String[] args) {
        ArrayList<Integer> list = new ArrayList<>();
        list.add(4);
        list.add(-2);
        list.add(1);
        list.add(-5);
        list.add(-3);
        System.out.println(getNegatives(list));
    }
}