It looks like you are having a problem setting up the IDE. I don't know anything about your IDE.
Take a look at the tutorial: Lesson: The "Hello World!" Application (The Java™ Tutorials > Getting...
Type: Posts; User: Norm
It looks like you are having a problem setting up the IDE. I don't know anything about your IDE.
Take a look at the tutorial: Lesson: The "Hello World!" Application (The Java™ Tutorials > Getting...
Are both java source files in the same folder?
What command is used to compile the programs?
Can you use the command prompt window and the javac command to compile the programs?
Where is the Balloon.class file when you try to compile BalloonTester.java? The Balloon.class file needs to be on the classpath so that the javac compiler can find it.
Where is the Balloon class defined? The compiler can not find its definition.