Introduction to Java

2. Simple Java Program

Answer:
No

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 Hello.java.

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

A 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?