Writing My First Java Program

<< Installing JDK 1.5 on Windows XP

<< Java Tutorials - Herong's Tutorial Notes

This section provides a tutorial example on how to write, compile, and execute the first Java program with JDK 1.5.0. Notes were taken in 2005.

Use NotePad to enter the first Java program into a file called Hello.java:

class Hello {
   public static void main(String[] a) {
      System.out.println("Hello world!"); 	
   }
}

Then compile this program in a command window with the javac command:

>c:\Program Files\Java\jdk1.5.0_09\bin\javac Hello.java

To execute the program, use the java command:

>c:\Program Files\Java\jdk1.5.0_09\bin\java -cp . Hello
Hello world!

Congratulations, you have successfully entered, compiled and executed your first Java program.

Sections in This Chapter

Downling and Installing JDK 1.5

Writing My First Java Program