Exercises

And that’s all theory for this chapter! So, roll up those sleeves, and let’s dive into your first day at Mesozoic Eden. Welcome aboard! Mesozoic Eden is a famous zoo where dinosaurs live that have been brought to live with high end genetic manipulation techniques. Here are some exercises for you to test your knowledge so far:

1. Your first task involves welcoming our guests. Modify the following code snippet so that it outputs "Welcome to Mesozoic Eden":

   public class Main {
       public static void main(String[] args) {
           System.out.println("Hello world");
       }
   }

2. Complete the following programs by filling out the blanks so that it prints out your name and the position you want to have in Mesozoic Eden 5 years from now:

   public class Main {
       public static void main(String[] args) {
           __________________________;
           String position = "Park Manager";
           System.out.println("My name is " + name + "
             and I want to be a " ______ " in Mesozoic
               Eden.");
       }
   }

3. We’ve received some questions about opening hours. Complete the following program so that it prints the park’s opening and closing hours:

   public class Main {
       public static void main(String[] args) {
           String openingHours = "08:00";
           String closingHours = "20:00";
       }
   }

4. Create a Java project with a package named dinosaur. You can create a package by right-clicking on the src/main/java folder, selecting “new” and choosing “package”.
5. Modify the code from exercise 1 so that it prints out "Welcome, [YourName] to Mesozoic Eden!", where [YourName] is replaced by, surprise surprise, your name. Bonus: try to create a separate String variable as shown in the second and third exercises.
6. Some guests reported feeling unsafe near the T-Rex. Let’s solve this by adding another System.out.println to the program of exercise 5. It should print the phrase "Mesozoic Eden is safe and secure." after the welcome message.