First Java Program

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.