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Welcome to CSE 131

Welcome to CSE 131. This is a very short exercise that you do as part of Lab 0

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Welcome to CSE 131

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  1. Welcome to CSE 131 • This is a very short exercise that you do as part of Lab 0 • Review the following slides to learn the anatomy of a Java class program. There is an exercise for you to complete as part of Lab 0 to test your knowledge of these slides. You can repeat the exercise as many times as you need until you are able to recognize the different parts of a Java program.

  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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