Introduction to Java

Work through these slides. As you read, think about and answer the questions at the bottom of each page. These will be your first experience with Java, so make sure you follow each step closely.

2. Simple Java Program



Simple Java Program 

Here is an example Java program. It is about as small as a Java program can be. When it runs, it writes Hello World! on the computer monitor. The details will be explained later.

class Hello
      public static void main ( String[] args )
      System.out.println("Hello World!");

This program can be created using a text editor such as the Notepad editor that comes with Windows. The program will be in a text file on the hard disk, named

See the following pages for details on how to do this.

source program is a text file that contains a program (such as above) written in a programming language. Since it contains ordinary text (stored as bytes) it can not be directly executed (run) by the computer system. As a text file, you can print it, display it on the monitor, or alter it with a text editor.

Question 2:

What are the two ways that a source program can be run on a computer system?