param != null

Week 4: Writing classes/10. Lap times' set and get methods

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+In the attached program, the class 'Results' is defined.
+
+The class attribute 'laptimes' lacks set and get methods.
+Implement the methods in the class. 
+The set method can be set to any value except null.
+
+
+import java.util.Random;
+import java.util.HashMap;
+
+public class Test {
+    public static void main(String[] args) {
+        final Random r = new Random();
+        
+
+        System.out.println("Testing class...");
+
+        double[] additions = {0.1, 0.2, 0.3, 0.4, 0.5, 0.75, 0.9, 0.99, 0.999};
+
+        HashMap<String, Double> lapTimes = new HashMap<>();
+        lapTimes.put("Jack Smith", r.nextInt(10) + 1 + additions[r.nextInt(additions.length)]);
+        lapTimes.put("Harry Johnson", r.nextInt(10) + 1 + additions[r.nextInt(additions.length)]);
+        lapTimes.put("Oliver Williams", r.nextInt(10) + 1 + additions[r.nextInt(additions.length)]);
+        lapTimes.put("George Brown", r.nextInt(10) + 1 + additions[r.nextInt(additions.length)]);
+        lapTimes.put("Charlie Jones", r.nextInt(10) + 1 + additions[r.nextInt(additions.length)]);
+
+        Results results = new Results("Montsa", new HashMap<>());
+
+        System.out.println("Created Results with");
+        System.out.println("new Results(\"Montsa\", new HashMap<String, Double>())");
+
+        System.out.println("Setting laptimes as " + lapTimes);
+        results.setLaptimes(lapTimes);
+        System.out.println("Laptimes now:" + results.getLaptimes());
+        System.out.println("");
+
+        System.out.println("Setting laptimes null...");
+        results.setLaptimes(null);
+        System.out.println("Laptimes now:" + results.getLaptimes());
+        System.out.println("");
+    }
+}
+
+class Results {
+    // PRIVATE ATTRIBUTES
+    private String race;
+    private HashMap<String, Double> laptimes;
+
+    // CONSTRUCTOR
+    public Results(String race, HashMap<String, Double> laptimes) {
+        this.race = race;
+        this.laptimes = laptimes;
+    }
+
+
+    // GET, SET METHODS
+    public String getRace() {
+        return race;
+    }
+
+    public void setRace(String race) {
+        this.race = race;
+    }
+
+
+    public HashMap<String, Double> getLaptimes() {
+        return this.laptimes;
+    }
+
+    public void setLaptimes(HashMap<String, Double> laptimes) {
+        if (laptimes != null) {
+            this.laptimes = laptimes;
+        }
+    }
+
+
+
+
+
+
+
+
+
+
+
+    
+}
+
+
+
+
+
+
+
+Testing class...
+Created Results with
+new Results("Montsa", new HashMap())
+Setting laptimes as {Harry Johnson=9.75, George Brown=3.999, Jack Smith=10.2, Charlie Jones=7.99, Oliver Williams=6.4}
+Laptimes now:{Harry Johnson=9.75, George Brown=3.999, Jack Smith=10.2, Charlie Jones=7.99, Oliver Williams=6.4}
+
+Setting laptimes null...
+Laptimes now:{Harry Johnson=9.75, George Brown=3.999, Jack Smith=10.2, Charlie Jones=7.99, Oliver Williams=6.4}
+
+