Student Placement Tests

Math Test 3 (Grade 8 Above)

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Java Test

Student Placement Tests Java Test

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In this assessment test, you will have 10 minutes to answer 10 multiple-choice questions.
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Question 1 of 10

1. Question
Predict the output of following Java Programs:

class Test {

    protected int x, y;

}

class Main {

    public static void main(String args[]) {

        Test t = new Test();

        System.out.println(t.x + " " + t.y);

    }

}
- Cannot run it because the class member x and the class member y are protected
- 0 0
- null null
- 2 random numbers
Question 2 of 10

2. Question
Is there any compiler error in following Java Program?

// filename Test.java

class Test {

    public static void main(String[] args) {

        for(int i = 0; 1; i++) {

            System.out.println("Hello");

            break;

        }

    }

}
- No errors
- Yes. The class name cannot be same as the file name.
- Yes. The for loop syntax is not correct.
- Yes. Need to import the System module
- Yes. The args is never used.
Question 3 of 10

3. Question
Which of following java programs have no errors?
- // filename Main.java
  class Main {
  public static void main(String args[]) {
  System.out.println(fun());
  }
  int fun() {
  return 20;
  }
  }
- // filename Main.java
  class Main {
  public static void main(String args[]) {
  System.out.println(this.fun());
  }
  int fun() {
  return 20;
  }
  }
- // filename Main.java
  class Main {
  public static void main(String args[]) {
  System.out.println(fun());
  }
  static int fun() {
  return 20;
  }
  }
- // filename Main.java
  class Main {
  public static void main(String args[]) {
  System.out.println(fun());
  }
  void fun() {
  return 20;
  }
  }
- // filename Main.java
  class Main {
  public static void main(String args[]) {
  Main main = new Main();
  System.out.println(main.fun());
  }
  int fun() {
  return 20;
  }
  }
Question 4 of 10

4. Question
What is the value of k after the following program finishes?

// filename Main.java
class Main {
public static void main(String args[]) {
int k =0;
for (byte i = ‘0’; i < 300 ; i++, k++) {
System.out.println(k);
}
}
}
- 300
- This program never finishes.
- 301
- 299
- 255
Question 5 of 10

5. Question
What is the outcome of this program?

import java.util.*;
public class ListExample1{
public static void main(String args[]){
//Creating a List
List<String> list=new ArrayList<String>();
//Adding elements in the List
list.add(“Mango”);
list.add(“Apple”);
list.add(“Grapes”);
//Iterating the List element using for-each loop
for(String fruit:list){
list.add(“Cake’”);
System.out.println(fruit);
}
}
}
- Print Mango then crashes
- Print Mango, Cake, then crashes
- Print Mango, Apple, Grapes, Cake
- Crashes
- Print Mango, Apple, Grapes
Question 6 of 10

6. Question
What is the output of this program?

public class Test

{

    public static void main(String[] args)

    {

        StringBuilder s1 = new StringBuilder("Java");

        String s2 = "Love";

        s1.append(s2);

        s1.substring(4);

        int foundAt = s1.indexOf(s2);

        System.out.println(foundAt);

    }

}
- 4
- -1
- 3
- 5
- Program crashes
Question 7 of 10

7. Question
What is the print of this program?

class Alpha

{

    public String type = "a ";

    public Alpha() { System.out.print("alpha "); }

}

public class Beta extends Alpha

{

    public Beta() { System.out.print("beta "); }

    void go()

    {

        type = "b ";

        System.out.print(this.type + super.type);

    }

    public static void main(String[] args)

    {

        new Beta().go();

    }

}
- alpha beta b b
- alpha beta a b
- beta alpha b b
- beta alpha a b
- beta alpha a a
Question 8 of 10

8. Question
What is the outcome of this program?

public class MyStuff

{

    String name;

    MyStuff(String n) { name = n; }

    public static void main(String[] args)

    {

        MyStuff m1 = new MyStuff("guitar");

        MyStuff m2 = new MyStuff("tv");

        System.out.println(m2.equals(m1));

    }

    @Override

    public boolean equals(Object obj)

    {

        MyStuff m = (MyStuff) obj;

        if (m.name != null) { return true; }

        return false;

    }

}
- Print True and m2.name is tv.
- Print False and m2.name is tv.
- Print False and m2.name is guitar.
- Print True and m2.name is tv.
Question 9 of 10

9. Question
What is the output of this program?

public class Calculator

{

    int num = 100;

    public void calc(int num) { this.num = num * 10; }

    public void printNum()     { System.out.println(num); }

    public static void main(String[] args)

    {

        Calculator obj = new Calculator();

        obj.calc(2);

        obj.printNum();

    }

}
- 20
- 200
- Program crashes
- 1000
- 100
Question 10 of 10

10. Question
What is the output of the following program?

// Main.java

public class Main

{

    public static void main(String args[])

    {

        String s1 = "abc";

        String s2 = s1;

        s1 += "d";

        System.out.println(s1 + " " + s2 + " " + (s1 == s2));

        StringBuffer sb1 = new StringBuffer("abc");

        StringBuffer sb2 = sb1;

        sb1.append("d");

        System.out.println(sb1 + " " + sb2 + " " + (sb1 == sb2));

    }

} //end class
- abcd abc false abcd abcd true
- abcd abcd true abcd abcd true
- abcd abc false abcd abc false
- abcd abcd false abcd abcd true

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