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package ee.taltech.b_practise.assignment8; import java.util.ArrayList; import java.util.List; public class Filter extends PositivesAndNegatives { static List<Integer> positive_numbers = new ArrayList<>(); static List<Integer> negative_numbers = new ArrayList<>(); static PositivesAndNegatives object = new PositivesAndNegatives(positive_numbers, negative_numbers); //todo A write tests in FilterTest //todo B make tests pass //todo C make your solution pretty // it's up to you how you want to handle null inputs // you don't need to modify PositivesAndNegatives object // P.S streams don't add much value here //todo A begins: public static List<Integer> test_1(List<Integer> list){ list.add(45); list.add(null); list.add(-34); list.add(-562); list.add(0); list.add(9034); return list; } public static List<Integer> test_2(List<Integer> list){ list.add(-320); list.add(null); list.add(-17924); list.add(285); list.add(-8902); list.add(null); list.add(59); list.add(0); list.add(-478); return list; } //todo A ends, todo B begins: public static void initial_method(List<Integer> numbers){ int i = 0; while(numbers.size() > 0){ if(numbers.get(i) == null){ continue; } else if(numbers.get(i) > -1){ positive_numbers.add(numbers.get(i)); }else{ negative_numbers.add(numbers.get(i)); } i++; } } // todo B ends, todo C begins: public static void letter_method(List<Integer> numbers){ numbers.removeAll(null); for(Integer i : numbers){ if (i >= 0) positive_numbers.add(i); else negative_numbers.add(i); numbers.remove(i); } } /* * divides integer input into positives and negatives * zero 0, can be treated as positive */ public PositivesAndNegatives filterToPositivesAndNegatives(List<Integer> numbers){ return new PositivesAndNegatives(); } // todo C ends tests cases begin public static void main(String[] args){ List<Integer> numbers = new ArrayList<>(); initial_method(test_1(numbers)); object.setPositives(positive_numbers); object.setNegatives(negative_numbers); System.out.println("The positive elements are: " + object.getPositives()); System.out.println("The negative elements are: " + object.getNegatives()); } }