trophyChallenge - 5 Problems

🎖️

Method Mastery

Get all challenges correct to earn this badge!

Test your skills under time pressure!

🧠 conceptual

intermediate

2:00remaining

Why use methods in Java?

Why do programmers use methods in Java programs?

ATo change the color of the text on the screen

BTo make the program run faster by skipping some lines

CTo store data permanently on the computer

DTo repeat the same code multiple times without writing it again

Attempts:

2 left

💻 code output

intermediate

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Output of method call

What is the output of this Java program?

Java

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

ANo output

BHello, friend!\nHello, friend!

Cgreet()\ngreet()

DHello, friend!

Attempts:

2 left

🔧 debug

advanced

2:00remaining

Why does this code cause an error?

What error does this Java code produce and why?

Java

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

ASyntaxError because of missing semicolon after println statement

BRuntimeException because printMessage is not defined

CNo error, prints 'Hi there!'

DCompilation error because main method is missing

Attempts:

2 left

📝 syntax

advanced

2:00remaining

Correct method declaration

Which option shows the correct way to declare a method named calculate that returns an integer and takes no parameters?

Apublic int calculate() { return 5; }

Bint calculate { return 5; }

Cpublic void calculate() { return 5; }

Dpublic calculate() int { return 5; }

Attempts:

2 left

🚀 application

expert

3:00remaining

How methods improve program structure

Imagine you are writing a program that calculates the area of different shapes. Why is it better to use separate methods for each shape's area calculation instead of writing all code in main?

AIt allows the program to run without a main method

BIt makes the program run faster because methods use less memory

CIt makes the program easier to read, test, and reuse parts of the code

DIt hides all the code so users cannot see it

Attempts:

2 left