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Create Compile And Execute Your First Java Program

Software Requirement

Prerequisite Knowledge

Installation Of JDK

Create Your First Program

1. Create a folder on any location to store java code files. Let us say a folder ‘files’ is created on c drive.
2. Open a notepad (or any text editor) and paste the following program

class MainClass {
  public static void main(String args[]) {
    System.out.println("Hello World");
  }
}




3. Save the file with the name MainClass.java (you can give any file name, but the file extension should be .java) on the location ‘C:\files’.

Code Explanation

1. A class MainClass is created.
2. Inside the MainClass we have a method called main method (program execution starts with main function).
3. Inside the main method we are printing a string ‘Hello World’.

Compile Your Program

1. Open command prompt and go the location ‘C:\Program Files\Java\jdk1.7.0_07\bin’.
2. Write following command in command prompt

javac  c:\files\MainClass.java



Here MainClass.java is the code file name.


3. Press enter.

Execute Your Program

1. Open command prompt (if the command prompt opened to compile the program is not closed).
2. Go to the location ‘C:\files’.
3. Write the following command in the command prompt

java MainClass



Here MainClass is the class name.


4. Press enter.

Output