1. Introduction
to
Java
http://www.slideshare.net/annagerber/intro-to-java

2. instructions

3. Programming languages

4. .java file
compile
.class file

5. Integrated Development
Environment (IDE)

6. Objects & Classes
Objects have:
 State (fields)
 Behaviour (methods)
Classes provide “blueprints” for different kinds of objects
public class MyClass {
}

7. main method
public class MyClass {
public static void main(String[] args){
// This is a comment
}
}

8. Statements
String name = “Anna”;
int numberOfThings = 0;
MyClass m = new MyClass();
m.doSomething();
// This is a comment on a single line
/* This is a longer comment
* that can go over more than one line
*/

9. Input and Output (IO)

10. Exercise 1
Write a program to output “Hello, World!”

11. Exercise 2
Write a program that asks someone to enter their
name and then prints “Hello, <name>”

12. Conditional behaviour
Boolean logic:
 and &&
 or || if (anna.isTired) {
 not ! if (isNightTime && !anna.isWorking) {
anna.sleep();
 equals ==
} else {
 not equal != anna.drinkCoffee();
 greater than > }
}
 less than <

13. Comparing Strings
 == and != are for basic types like integers
 For objects use equals() e.g. to compare Strings:
If (string1.equals(string2)) …
If (string1.equalsIgnoreCase(string2)) …

14. Loops
while (coffee) {
person.drink(coffee);
}
for (int i = 0; i < 10; i++) {
// do something 10 times
}

15. Exercise 3
 Write a program with the following behaviour:
 Ask the person to enter some text
 If the person says “yay” the program responds with “hey”
 If the person says “boo” the program responds with “hoo”
 If the person says “how” the program responds with “now”
 Challenge:
 Keep prompting and responding until the input is “bye”

16. Putting it all together:
Choose your own
adventure
 Write a choose your own adventure game!
System.out.println(“You are being chased by a T-Rex, do you a) run or b) fight?”);
input = scan.next();
if ( input.equals(“a”)) ...