Writing first Java program - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to print "Hello, World!" to the console.

Java

public class HelloWorld {
    public static void main(String[] args) {
        System.out.[1]("Hello, World!");
    }
}

Drag options to blanks, or click blank then click option'

Aprintln

Bprint

Cwrite

Doutput

Attempts:

3 left

💡 Hint

Common Mistakes

Using print instead of println may not add a new line after output.

The println method prints the text and moves to a new line, which is the standard way to output text in Java.

2fill in blank

medium

Complete the code to declare the main method correctly.

Java

public class Main {
    public static void [1](String[] args) {
        System.out.println("Welcome!");
    }
}

Drag options to blanks, or click blank then click option'

Aexecute

Bmain

Crun

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using other method names like start or run will not run the program automatically.

The main method must be named main for the Java program to start execution there.

3fill in blank

hard

Fix the error in the class declaration to make it valid Java code.

Java

public [1] HelloWorld {
    public static void main(String[] args) {
        System.out.println("Hi!");
    }
}

Drag options to blanks, or click blank then click option'

Aclass

BClass

Cmethod

Dfunction

Attempts:

3 left

💡 Hint

Common Mistakes

Using uppercase Class causes a syntax error.

The keyword to declare a class in Java is class in lowercase.

4fill in blank

hard

Fill both blanks to complete the program that prints a greeting.

Java

public [1] Greeting {
    public static void main(String[] [2]) {
        System.out.println("Hello!");
    }
}

Drag options to blanks, or click blank then click option'

Aclass

Bargs

Cargv

DClass

Attempts:

3 left

💡 Hint

Common Mistakes

Using uppercase Class or argv instead of args.

The class declaration uses class and the main method parameter is usually named args.

5fill in blank

hard

Fill all three blanks to complete the Java program that prints a message.

Java

public [1] MessagePrinter {
    public static void main(String[] [2]) {
        System.out.[3]("Message printed!");
    }
}

Drag options to blanks, or click blank then click option'

Aclass

Bargs

Cprintln

DClass

Attempts:

3 left

💡 Hint

Common Mistakes

Using uppercase Class, argv, or print instead of println.

The class keyword is class, the main method parameter is args, and the print method is println.