What is Java - Interactive Quiz & Practice

Practice - 5 Tasks

1fill in blank

easy

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

Java

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

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

Aecho

Bprint

Cwrite

Dprintln

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'print' will print text but not move to a new line.

Using 'write' or 'echo' are not valid methods here.

The println method prints the text and moves to a new line.

2fill in blank

medium

Complete the code to declare an integer variable named 'age' with value 25.

Java

public class Main {
    public static void main(String[] args) {
        [1] age = 25;
    }
}

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Aint

Binteger

Cvar

Dnum

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'integer' is not a Java keyword.

Using 'var' requires Java 10+, but 'int' is standard.

In Java, int is the keyword to declare an integer variable.

3fill in blank

hard

Fix the error in the code to correctly create a Java class named 'Car'.

Java

public [1] Car {
    // class body
}

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Aclass

Bmethod

Cfunction

Dinterface

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'function' or 'method' instead of 'class'.

Using 'interface' defines a different structure.

Use the keyword class to define a class in Java.

4fill in blank

hard

Fill both blanks to declare a method named 'greet' that returns nothing and prints a message.

Java

public [1] greet() {
    System.out.[2]("Hello!");
}

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Avoid

Bprintln

Cprint

Dint

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'int' as return type when method returns nothing.

Using 'print' instead of 'println' for new line.

The method returns void (nothing) and uses println to print with a new line.

5fill in blank

hard

Fill all three blanks to declare a Java class 'Person' with a private String field 'name' and a constructor.

Java

public class Person {
    private [1] [2];

    public Person([1] [2]) {
        this.[2] = [2];
    }
}

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

Aint

BString

Cname

Dage

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'int' or 'age' instead of 'String' and 'name'.

Mismatching field and parameter names.

The field is a String named name. The constructor uses the same type and name.