Welcome to the first course in Java!

Requirements:

• IntelliJ IDEA CE

You can download IntelliJ IDEA CE from the JetBrains webpage: https://www.jetbrains.com.cn/en-us/idea/download

Scroll down to the second option, the “Community Edition”, which is free.

Start a new project called “J1-1 Strings”. Then type the following code into the Main.java file:

public class Main {
    public static void main(String[] args) {

        // Code starts here:

        // Print a message.
        System.out.println("Hello, my name is Appledog!");

        // Create a Scanner object to read input
        Scanner scanner = new Scanner(System.in);

        // Prompt the user for their name
        System.out.print("What is your name? ");

        // Read the input from the user
        String name = scanner.nextLine();

        // Output a response
        System.out.println("Hello, " + name + "!");

        // Close the scanner
        scanner.close();
    }
}

Now try to run the program. On Mac it's Control-R. On windows, I think, it's Shift-F10. Get used to using a keyboard; it's faster.

Oh no! Your first error. Find the line with the red underlined word “Scanner”. This tells you that “Scanner” was not found. Click on this word and the IDE will suggest a fix if possible. Here, it can automatically fix the error by inserting a line of code at the top of the program:

import java.util.Scanner