Java Program 1 – Compile and Run a Hello-world Java Program

Step 1
 
Open "Folder" and create a new directory called "myproject" under your home directory to keep all your works.


Step 2
 
Open "Text Editor" (gedit). Enter the following source code and save as "Hello.java" under the "~/myproject" directory created eariler.
 
    public class Hello {   // To save as "Hello.java" under "~/myproject"
       public static void main(String[] args) {
          System.out.println("Hello, world from Ubuntu!");
       }

    }


Step 3
To compile the Hello-world Java program, launch a Terminal and issue these commands:
 
// Change directory to where the source code resides
cd ~/myproject
     
// List the contents of current directory. Check for "Hello.java"
ls
    …… Hello.java ….
     
// Compile "Hello.java" into "Hello.class"
javac Hello.java
     
// Check for "Hello.class"
ls
    …… Hello.class ….


Step 4
 
Run the Hello-world Java program:
 
// Run "Hello.class"
java Hello

    Hello, world from Ubuntu!

Compile and Run a Hello-world Java Program


 

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