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.
This program can be created using a text editor such as the Notepad editor that comes with Windows. (Details later.) This source program is a text file saved on a hard disk. The file is named Hello.java.
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.
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