Static methods in Java - Practice Problems & Coding Challenges

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Challenge - 5 Problems

💻 code output

intermediate

Output of static method call

What is the output of the following Java program?

Java

public class Test {
    static int count = 0;
    public static void increment() {
        count++;
    }
    public static void main(String[] args) {
        increment();
        increment();
        System.out.println(count);
    }
}

A 2

B 0

C 1

D Compilation error

🧠 conceptual

intermediate

Static method access to instance variables

Which statement about static methods in Java is true?

A Static methods can only access static variables directly.

B Static methods can directly access instance variables without an object.

C Static methods can access instance variables if they are declared final.

D Static methods can access instance variables only if the class is final.

🔧 debug

advanced

Identify the error in static method usage

What error will this code produce?

Java

public class Example {
    int number = 5;
    public static void printNumber() {
        System.out.println(number);
    }
    public static void main(String[] args) {
        printNumber();
    }
}

A Output: 5

B Runtime error: NullPointerException

C Compilation error: non-static variable number cannot be referenced from a static context

D Compilation error: missing return statement

💻 code output

advanced

Output of static method with parameters

What is the output of this Java program?

Java

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

A Compilation error

B 7

C 34

D 12

🚀 application

expert

Static method call from instance method

Consider this Java class. What will be the output when main runs?

Java

public class Counter {
    private static int count = 0;
    public void increment() {
        count++;
    }
    public static void printCount() {
        System.out.println(count);
    }
    public static void main(String[] args) {
        Counter c1 = new Counter();
        Counter c2 = new Counter();
        c1.increment();
        c2.increment();
        printCount();
    }
}

A Compilation error

B 2

C 1

D 0