Method declaration in Java - Practice Problems & Coding Challenges

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Challenge - 5 Problems

💻 code output

intermediate

Output of a method with parameters

What is the output of the following Java program?

Java

public class Test {
    public static int multiply(int a, int b) {
        return a * b;
    }
    public static void main(String[] args) {
        System.out.println(multiply(3, 4));
    }
}

A 7

B 12

C 34

D Error: method multiply not found

💻 code output

intermediate

Return type and output

What will be printed when this Java code runs?

Java

public class Demo {
    public static String greet() {
        return "Hello!";
    }
    public static void main(String[] args) {
        System.out.println(greet());
    }
}

A null

B greet

C Hello!

D Compilation error

💻 code output

advanced

Method overloading output

What is the output of this Java program with overloaded methods?

Java

public class Overload {
    public static int add(int a, int b) {
        return a + b;
    }
    public static double add(double a, double b) {
        return a + b;
    }
    public static void main(String[] args) {
        System.out.println(add(2, 3));
        System.out.println(add(2.0, 3.0));
    }
}

A

5.0
5

B

5
5

C Compilation error due to ambiguous method call

D

5
5.0

💻 code output

advanced

Void method and output

What will be printed when this Java program runs?

Java

public class VoidTest {
    public static void printMessage() {
        System.out.println("Hi there!");
    }
    public static void main(String[] args) {
        printMessage();
        System.out.println("Done");
    }
}

A

Hi there!
Done

B

Done
Hi there!

C Hi there!Done

D Compilation error: void method used in print statement

💻 code output

expert

Method recursion output

What is the output of this Java program using recursion?

Java

public class Recursion {
    public static int factorial(int n) {
        if (n <= 1) return 1;
        else return n * factorial(n - 1);
    }
    public static void main(String[] args) {
        System.out.println(factorial(4));
    }
}

A 24

B 10

C Error: StackOverflowError

D 1