ArrayList<objClassName>

Week 4: Writing classes/14B. Find the oldest dog

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+In the attached program, the class Dog is defined.
+
+See the definition of the class, and then write the test class method
+public static String oldestDog(ArrayList<Dog> dogs)
+
+which takes as its parameter a list of dogs. The method searches for the oldest dog's name and returns it.
+
+
+
+
+
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Random;
+
+public class Test{
+    public static void main(String[] args){
+        final Random r = new Random();
+        
+        
+        String[] nt = {"Fifi","Jackie","Lassie","Rin-Tin-Tin","Snoopy","Scooby-Doo"};
+        
+        for (int testi = 1; testi <= 3; testi++) {
+            System.out.println("Test " + testi);
+            ArrayList<String> names = new ArrayList<String>(Arrays.asList(nt));
+           
+            int year = r.nextInt(100) + 1900;
+            ArrayList<Dog> dogs = new ArrayList<>();
+            while (!names.isEmpty()) {
+                Dog k = new Dog(names.remove(r.nextInt(names.size())), year);
+                year += r.nextInt(15) + 1;
+                dogs.add(k);
+            }
+            Collections.shuffle(dogs);
+            
+            System.out.println("Dogs: " + dogs);
+            System.out.println("Oldest dog: " + oldestDog(dogs));
+            System.out.println("List after method call: " + dogs);
+            System.out.println("");
+        }
+        
+    }
+
+
+
+    //ADD HERE
+    public static String oldestDog(ArrayList<Dog> dogs) {
+        int oldestDogYear = 9999;
+        String oldestDogName = "";
+        for (Dog dog: dogs) {
+            // we want the smallest dog year (for the oldest dog)
+            if (dog.getBirthyear() < oldestDogYear) {
+                oldestDogYear = dog.getBirthyear();
+                oldestDogName = dog.getName();
+            }
+        }
+        return oldestDogName;
+    }
+
+
+    
+
+
+
+
+
+
+
+
+}
+
+class Dog {
+    private String name;
+    private int birthyear;
+
+    
+    public Dog(String name, int birthyear) {
+        this.name = name;
+        this.birthyear = birthyear;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getBirthyear() {
+        return birthyear;
+    }
+
+    @Override
+    public String toString() {
+        return name + " (" + birthyear + ")";
+    }   
+}
+
+
+
+
+
+
+
+Test 1
+Dogs: [Lassie (2018), Snoopy (1995), Fifi (1993), Scooby-Doo (2013), Rin-Tin-Tin (2000), Jackie (2012)]
+Oldest dog: Fifi
+List after method call: [Lassie (2018), Snoopy (1995), Fifi (1993), Scooby-Doo (2013), Rin-Tin-Tin (2000), Jackie (2012)]
+
+Test 2
+Dogs: [Scooby-Doo (1931), Lassie (1937), Jackie (1961), Snoopy (1948), Fifi (1964), Rin-Tin-Tin (1976)]
+Oldest dog: Scooby-Doo
+List after method call: [Scooby-Doo (1931), Lassie (1937), Jackie (1961), Snoopy (1948), Fifi (1964), Rin-Tin-Tin (1976)]
+
+Test 3
+Dogs: [Scooby-Doo (1937), Fifi (1947), Snoopy (1931), Jackie (1921), Lassie (1962), Rin-Tin-Tin (1946)]
+Oldest dog: Jackie
+List after method call: [Scooby-Doo (1937), Fifi (1947), Snoopy (1931), Jackie (1921), Lassie (1962), Rin-Tin-Tin (1946)]
+
+
+
+