CSE110 Lecture 03

CSE110 Principles of Programming with Java Lecture 03: Classes, methods,
and variables Javier Gonzalez-Sanchez javiergs@asu.edu javiergs.engineering.asu.edu | javiergs.com Office Hours: By appointment

IDE Using IntelliJ

Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 3 Previously…

IDE Using Eclipse

IDE Using TutorialsPoint.com

Java Classes, Methods and Variables

Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 24 Java
Program Structure • A program is made up of one or more classes • A class contains one or more methods • A method contains program statements

Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 25 Java
Program Structure • program statements can be: • Variables – places to store information • Instructions – actions to be done

and static public class TheClassName { } public static void theFirstMethodName() { } public static void secondMethodName(){ } // instructions go here // instructions go here // variables go here // variables go here // variables go here public static void main( ) { } // instructions go here // variables go here

Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 27 Example
without main()

Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 28 main()
method • All programs should have one and only one main() method. • Trying to execute a class without a main() method generates a compilation error

with main()

main() calling methods

Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 31 Template
public class TheClassName { } public static void theFirstMethodName() { } public static void secondMethodName(){ } // instructions go here // instructions go here // variables go here // variables go here // variables go here public static void main( ) { } // instructions go here // variables go here

Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 32 Global
Variable

Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 33 Error

Javier Gonzalez-Sanchez | CSE110 | Summer 2020 | 34 Homework
Read Sections 2.1, 2.2, and 2.3

CSE110 - Principles of Programming Javier Gonzalez-Sanchez javiergs@asu.edu Summer 2022
Disclaimer. These slides can only be used as study material for the class CSE110 at ASU. They cannot be distributed or used for another purpose.

CSE110 Lecture 03

CSE110 Lecture 03

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