Session J2: Objects and Methods

In this laboratory session, you will build and use your first Java objects and develop your first Java classes. The purposes of this lab session are to

• introduce object-oriented programming, including the concepts of object and class;
• introduce Java's version of modular programming, in which different portions of a program are placed in different files;
• introduce methods, small subprograms which you write and include in classes; and
• prepare you for some of the difficulties of dealing with objects.

Your instructor will tell you which of the proposed experiments you are to perform.

Prerequisite skills:

• Editing, compiling, and executing Java programs
• Basic Java programming (including the main method)

Required Java files:

• AverageTester.java
• JustPlaneFun.java
• Plane.java
• Point.java
• PointFun.java
• PointPrinter.java
• PointReader.java
• SimpleInput.java
• SimpleOutput.java
• TextPlane.java
• TextPlaneFun.java

Optional applet files:

• circle.html
• CircleApplet.java
• helloworld.html
• HelloWorldApplet.java