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Java Quiz 2: 24 March 2024 (January 2024 term)

Question 1

+6 marksOne correct option

Consider the Java code given below.

The method boolean containsKey(Object key) in the class Map returns true if and only if the map contains a mapping for a key k such that Objects.equals(key, k).

java
import java.util.*;
interface Shape {
    void draw();
}
class Circle implements Shape {
    public void draw() {
        System.out.println("Drawing a Circle");
    }
}
class Square implements Shape {
    public void draw() {
        System.out.println("Drawing a Square");
    }
}
class DrawingBoard<T extends Shape> {
    private Map<String, T> m = new HashMap<>();// LINE 1
    public void add(String name, T shape) {
        m.put(name, shape);
    }
    public void draw(String name) {
        if (m.containsKey(name)) {
            T s = m.get(name); //LINE 2
            s.draw();
        } else {
            System.out.println("Shape not found");
        }
    }
}
public class Test {
    public static void main(String[] args) {
        DrawingBoard<Shape> dB = new DrawingBoard<Shape>();
        Shape s1 = new Circle();
        Shape s2 = new Square();
        dB.add("circle", s1);
        dB.add("square", s2);
        dB.draw("circle");
        dB.draw("triangle");
    }


}

Choose the correct option.

  1. A
  2. B
  3. C
  4. D

Question 2

+6 marksOne correct option

Consider two Java files located in two different packages as shown below.

A.java:

java
package com.pack1;
public class A {
    void methodOne() {
        System.out.println("Display methodOne");
    }
    private void methodTwo() {
        System.out.println("Display methodTwo");
    }
    protected void methodThree() {
        System.out.println("Display methodThree");
    }
    public void methodFour() {
        System.out.println("Display methodFour");
    }
}

B.java

java
package com.pack2;
import com.pack1.A;
public class B extends A {
    public static void main(String[] args) {
        B obj = new B();
        obj.methodOne();    //LINE 1
        obj.methodTwo();    //LINE 2
        obj.methodThree();  //LINE 3
        obj.methodFour();   //LINE 4
}

Choose the correct option.

  1. A
  2. B
  3. C
  4. D

Question 3

+6 marksOne correct option

Consider the Java code given below.

java
class Validation {
    public boolean validate(int a, int b) {
        assert a > 0: "a should be greater than zero";  //LINE 1
        assert b >= 1: "b should not be less than one";  //LINE 2
        return true;
    }
}
public class AssertTest {
    public static void main(String[] args) {
        int a = 1;
        int b = -1;
        int result = 0;
        Validation obj = new Validation();
        if (obj.validate(a, b))
            result = a / b;
        assert result > 0: "result should be greater than zero";  //LINE 3
        System.out.println(result);
    }
}

Choose the correct option when the program is executed as:
java -ea AssertTest

  1. A
  2. B
  3. C
  4. D

12 more questions in this paper

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More on the Java Quiz 2 24 Mar 2024 paper

The IIT Madras BS Programming Concepts using Java (Java) Quiz 2 paper sat on 24 Mar 2024, in the January 2024 term: 15 questions for 100 marks in 120 minutes. The first 3 questions are below. Sign in with Google — it is free — to see the whole paper with its answers and explanations, in learning mode or as a timed mock test.

FeatureJava Quiz 2 24 Mar 2024 at a glance
TermJanuary 2024 term
SubjectProgramming Concepts using Java
Course codeBSCS2005
Questions15
Marks100
Duration120 min
MCQ12
MSQ3
Official paperIIT M DIPLOMA AN EXAM QDD2 24 Mar 2024
Negative markingNo negative marking.
Updated

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