Chapter 21. The final outcome of the escape and the Java course Chapter 21. The final outcome of the escape and the Java course Everything went as we expected. We managed to get out of prison without any complications. We’re following the plan and we’re already at Pedro’s friend’s house. I don’t have much time, … Read more
Chapter 20. The final phase, we create a door unlocking tool Chapter 20. The final phase, we create a door unlocking tool We have everything ready for the escape. As I’ve already told you, I’ll be in charge of opening the final door. Right next to the exit there’s a table with a computer from … Read more
Chapter 19 Exercises – OOP in Java Chapter 19 Exercises Typical Object Exercises Using Constructors Exercise 1 Create and Display Book Information. Create a Book class with title and author attributes. Use a constructor to initialize these attributes and a method to display the book’s information. Solution: public class Book { private String title; private … Read more
Chapter 19. Functions and OOP in Java Chapter 19. Functions and OOP in Java Functions and OOP Before moving to the final phase of our plan, you need to understand a couple more things. I’m referring to functions and object-oriented programming exercises. By now you already master the syntax, but you program in a linear … Read more
Chapter 18. Intercepting Guard Conversations Chapter 18. Intercepting Guard Conversations During the final phase of our plan, Rich and Pedro will stay a bit more behind, and I’ll move ahead to take care of opening the door. I have very clear instructions, so I don’t think there will be any problems. Evidently, Bud and Pedro … Read more
Chapter 17. Decoding Communication Systems Chapter 17. Decoding Communication Systems My fellow escapees have given me homework. I think what they want is to help me keep my mind occupied so I’ll be a bit calmer. Bud is going to access the guards’ communication system and has asked me to help him. If anyone finds … Read more
Chapter 16 Exercises Exercises Topic 16 – For-Each Loops in Java Exercises Topic 16 Exercise 1. Iterate over an array of integers and print each number on a new line. Solution: public class Main { public static void main(String[] args) { int[] numbers = {1, 2, 3, 4, 5}; for (int number : … Read more
Chapter 16. Final Preparations / For-Each Loops Chapter 16. Final Preparations / For-Each Loops There’s nothing left to do; we’re escaping next Monday. Today is Tuesday, so we have enough time to prepare everything. Tomorrow, Chani’s cousin will come, and I’ll give him all the information. On the other hand, I need to explain exactly … Read more
Chapter 15. Bypassing the Time Counter System Chapter 15. Bypassing the Time Counter System The corridor leading to the prison exit is the most heavily guarded. You might think it’s because of fear that prisoners might escape through there, but that’s not the case. What happens is that everyone enters and exits through the same … Read more
Exercises Topic 14 – Reading and Writing Text Files in Java Exercises Topic 14 Exercise 1. Write a program that saves the phrase “Hello World” in a file called output.txt. Solution: import java.io.FileWriter; import java.io.IOException; public class Main { public static void main(String[] args) { try (FileWriter writer = new FileWriter(“output.txt”)) { writer.write(“Hello World”); System.out.println(“Text … Read more