Method overloading in Java - Practice Problems & Coding Challenges

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Challenge - 5 Problems

💻 code output

intermediate

Output of overloaded methods with different parameter types

What is the output of the following Java program?

Java

public class Test {
    public static void print(int x) {
        System.out.println("int: " + x);
    }
    public static void print(String x) {
        System.out.println("String: " + x);
    }
    public static void main(String[] args) {
        print(5);
        print("5");
    }
}

A

int: 5
String: 5

B

String: 5
int: 5

C

int: 5
int: 5

D

String: 5
String: 5

💻 code output

intermediate

Overloading with different number of parameters

What will be printed when the following Java code runs?

Java

public class Demo {
    static void show() {
        System.out.println("No parameters");
    }
    static void show(int a) {
        System.out.println("One parameter: " + a);
    }
    public static void main(String[] args) {
        show();
        show(10);
    }
}

A

No parameters
One parameter: 10

B

One parameter: 10
No parameters

C

No parameters
No parameters

D

One parameter: 10
One parameter: 10

💻 code output

advanced

Overloading with widening and boxing

What is the output of this Java program?

Java

public class OverloadTest {
    static void test(long x) {
        System.out.println("long: " + x);
    }
    static void test(Integer x) {
        System.out.println("Integer: " + x);
    }
    public static void main(String[] args) {
        test(5);
    }
}

A Runtime error

B Integer: 5

C Compilation error

D long: 5

💻 code output

advanced

Overloading with varargs and exact match

What will be printed when this Java code runs?

Java

public class VarargsTest {
    static void display(int a, int b) {
        System.out.println("Two ints: " + a + ", " + b);
    }
    static void display(int... nums) {
        System.out.println("Varargs: " + nums.length);
    }
    public static void main(String[] args) {
        display(1, 2);
    }
}

A Compilation error

B Varargs: 2

C Two ints: 1, 2

D Runtime error

💻 code output

expert

Overloading with inheritance and null argument

What is the output of this Java program?

Java

public class InheritanceOverload {
    static void call(Object o) {
        System.out.println("Object version");
    }
    static void call(String s) {
        System.out.println("String version");
    }
    public static void main(String[] args) {
        call(null);
    }
}

A Object version

B String version

C Runtime error

D Compilation error