Java Example Program

• Main Java Sun Web Page
• Alphabetical Listing of Java Library Classes
• (See Java Sun API Specification Page for other versions, etc.)

Compiling and running a java program

• To create a Java program, you must ensure that the name of the class in the file is the same as the name of the file (and that the file has the extension .java).

• To compile the program use the command javac as in:

      javac HelloWorld.java
  

  This will take the source code in the file HelloWorld.java (which better contain the class HelloWorld) and create the Java ByteCode in a file HelloWorld.class.

• To run the compiled program use the command java as in:

      java HelloWorld
  

  Note that you do not use the any file extension in this command.

Very Simple Java Example Programs

• HelloWorld.java

• HelloDate.java

• FunctionCall.java

Array usage in Java

• A tutorial on using arrays in java

• ArrayDemo.java

Class Usage in Java

• Point2d.java

• Test jig for Point2d class (PointTester.java)

• Point3d.java

I/O and files in Java

• KeyboardIntegerReader.java

• KeyboardReader.java

• MyFileReader.java

• MyFileReader.txt

• MyFileWriter.java

• MyFileWriter.txt

Exception examples in Java

• HelloWorldException.java

• KeyboardReaderError.java

• DivBy0.java

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