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Welcome to CSE 131

Welcome to CSE 131. Professor: Ron Cytron TAs: Ignacio DeErausquin , Kyle Cooper, Andy Gorman URL http://www.cs.wustl.edu/~cytron/cse131 Or: simply Google cytron cse131 Today: View from the top (anatomy of a Java program)

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Welcome to CSE 131

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  1. Welcome to CSE 131 • Professor: Ron Cytron • TAs: Ignacio DeErausquin, Kyle Cooper, Andy Gorman • URL http://www.cs.wustl.edu/~cytron/cse131 • Or: simply Google cytron cse131 • Today: • View from the top (anatomy of a Java program) • Lab 0 (find the link on the course calendar / syllabus page • Friday: • Assigned reading shown on web page before each lecture • Participation grade requires responses about the reading

  2. Anatomy of a Java program • A Java program can have many packages. • Each package contains a set of related classes. • For example, a baseball package might have a Pitcher, Batter, and Scorekeeper class • The name of this package is lab0

  3. Anatomy of a Java program • A class describes the behaviors of an object. • This class is called RobotInstructions • It has just one kind of behavior which is to act • Other objects have more behaviors • For example, a Pitcher might throw a ball, catch a ball, etc.

  4. Anatomy of a Java program • The behaviors in a class are divided into methods • This method is named “act” • A Pitcher might have a method to throw a ball, catch a ball, etc.

  5. Anatomy of a Java program • For a method to do its job, it sometimes needs information • You see here an “incoming parameter” – a “robot” that is provided to the “act” method. • The act method can then issue instructions to the robot

  6. Anatomy of a Java program • This line of code sends a message to an object to tell it to do something • The object here is “robot” – it is the thing we are telling to do something • The method call is “forward” – we are asking the robot to go forward • This method call requires some information – how far forward should it go? • The value of 100 is the outgoing parameter, sent to the forward method, addressed to the robot.

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