Stack memory in Java - Practice Problems & Coding Challenges

trophy

Challenge - 5 Problems

💻 code output

intermediate

What is the output of this Java code involving stack memory?

Consider the following Java method call sequence. What will be printed to the console?

Java

public class StackTest {
    public static void main(String[] args) {
        methodA();
    }

    static void methodA() {
        int x = 5;
        methodB(x);
    }

    static void methodB(int y) {
        y += 10;
        System.out.println(y);
    }
}

A 15

B 10

C 5

D Compilation error

💻 code output

intermediate

What happens to local variables when a method finishes?

What will be the output of this Java program?

Java

public class StackMemoryDemo {
    public static void main(String[] args) {
        int a = 3;
        int b = multiplyByTwo(a);
        System.out.println(b);
    }

    static int multiplyByTwo(int num) {
        int result = num * 2;
        return result;
    }
}

A 6

B 3

C 0

D Runtime error

💻 code output

advanced

What is the output of this recursive method affecting stack memory?

Analyze the following Java code and determine what it prints.

Java

public class RecursionStack {
    public static void main(String[] args) {
        printNumbers(3);
    }

    static void printNumbers(int n) {
        if (n == 0) return;
        System.out.print(n + " ");
        printNumbers(n - 1);
    }
}

A 1 2 3

B 3 2 1

C 3 2 1 0

D 0 1 2 3

💻 code output

advanced

What error occurs when stack memory overflows in Java?

What will happen when running this Java program?

Java

public class StackOverflowDemo {
    public static void main(String[] args) {
        recurse();
    }

    static void recurse() {
        recurse();
    }
}

A No output, program runs forever

B NullPointerException

C OutOfMemoryError

D StackOverflowError

🧠 conceptual

expert

How does Java manage stack memory for method calls?

Which statement best describes how Java uses stack memory during method execution?

A Stack memory is shared between all threads and stores global variables only.

B Java stores all objects created in methods on the stack memory permanently.

C Each method call creates a new stack frame storing local variables and parameters; frames are removed when methods return.

D Java uses stack memory only for static variables and constants.