go to previous page   go to home page   go to next page hear noise highlighting


No. (If you got this question wrong, or don't even know what it asks, look back at Chapter Four.)

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.

public 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. Save the program in a text file on the hard disk, named Hello.java. As a text file, you can print it, display it on the monitor, copy it to another text file, or alter it with a text editor.

The file must be named exactly Hello.java (upper and lower case as given).

See the following chapter for details on how to do this for Windows.

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 cannot be directly executed (run) by the computer system.


(Review of Chapter 4:) What are the two ways that a source program (written in any programming language) could be run on a computer system?

go to previous page   go to home page   go to next page