1. Programming in Java Transitioning from Alice

2. Becomes not myFirstMethod but …. public static void main (String[] arg) { // code for testing classes goes here }

3. Your project and classes are similar

4. Both functions and methods are referred to as methods in Java

5. void methods are methods which do not return values

6. Methods with “return types” are often referred to as functions – just as in Alice, they can return numbers (called int or double s), boolean s, String s, or Objects

7. Properties in Java are referred to as private instance variables

8. Simple Programs Very simple program to print a name Simple program to test a separate class and instantiated objects

10. Output from Play

11. Java from Eclipse main method

12. Running it Output

13. Bunny and UseBunny Create a Bunny class Properties : color and age Modifier methods to change those properties Accessor methods to return those properties Special method of reach class used to create the instances – called constructor

15. Constructor and Instance Variables class Bunny { //In Java need a constructor for every new class public Bunny() //set default properties { age = 0; color = "white"; } //private instance variables (like properties) int age; String color;

16. Accessor Methods -- usually functions //accessor methods public String giveColorInfo() { return color; } public int giveAgeInfo() { return age; }

17. Modifier Methods // modifier methods – change properties public void setColor (String newColor) { color = newColor; } public void setAge (int newAge) { age = newAge; }

18. UseBunny.java Revisited class UseBunny{ public static void main(String[] arg) { Bunny b = new Bunny(); //like add Object Bunny b1 = new Bunny(); b.setAge(6); b1.setColor("green"); System.out.println("The first bunny is :"); System.out.println(b.giveAgeInfo() + " and is " + b.giveColorInfo()); System.out.println("The second bunny is :"); System.out.println(b1.giveAgeInfo() + " and is " + b1.giveColorInfo()); }

19. Java Assignment Java Assignment 1 – Part 1:Make the Lab1 project and run the FirstOne Java program Part 2: Make the Lab1PtII project and get the UseBunny and Bunny to work