Learn to Code: Java for Absolute Beginners/

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First Java Program

First Java Program

Learn to create and execute the first Java program.

We'll cover the following...

Problem solving with Java

The basic tools for understanding the flow and the results of simple programs are execution sheetsAn execution sheet is a manual way for observing and updating the values of the variables at each step of the execution of a program. and flowchartsA flowchart is a diagram that helps understand the sequence of instructions in a program having decision.. However, they become complicated when we have problems with a large number of decisions. Therefore, we provide executable embedded code widgets to observe the program output by executing it.

We can run a program as many times as we want, to try out different inputs of variables. We can also edit these programs to observe the result of a change in a value or logic for our learning.

In Java, we use nextLine() for input (to read a value from the user) and System.out.println() for print (to display a value on the screen as output).

Hello World

It’s time to write our first program in Java, which will simply display the message “Hello World!” on the screen.

This is the code widget that we’ll use to write our Java code. We may execute our Java program by clicking the “Run” button at the bottom of the widget:

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// First Java program to display Hello World
class Test
{
    public static void main(String args[]) 
    {
        System.out.print("Hello World!");
    }
}

Note: We can add non-executable text ...