Question

1) Consider the following Java method. Which term best describes what this method computes?

static int doSomething(int[] a) {
    int b = a[0];
    for (int c : a) if (b > c) b = c;
    return b;
}

a. average

b. maximum

c. minimum

d. sum

e. transpose

2) Consider the following Java program, what starts on line 2?
1 public class HelloWorld {
2     // My first program!
3     public static void main(String[] args) {
4         System.out.println("Hello, World!");
5     }
6 }

a. a variable declaration

b. a statement

c. a method (subroutine) definition

d. a comment

e. a class definition

3) What is the output of the following Java program?
import java.util.*;
class ArrayGames {
    public static void main(String[] args) {
        int[] a = new int[5];
        System.out.println(Arrays.toString(a));
    }
}

a. null

b. [0, 0, 0, 0, 0]

c. [5, 5, 5, 5, 5]

d. [null, null, null, null, null]

e. No output. It throws an exception.

4) Consider the following class definition. Which variables can be used in the missing "println" expression on line 8?
1 public class PrintStuff
2 {
3      public static void main()
4      {
6          {
7              int i = -1;
8              System.out.println(_____);
9          }
10         int j = 1;
11         for (j = 0; j < 10; j++) {
12             System.out.println(_____);
13         }
14         {
15             int k;
16             for (k = 0; k < 10; k++) {
17                System.out.println(_____);
18             }
19         }
20        System.out.println(_____);
21     }
22 }

a. Only "i"

b. Only "j"

c. Only "k"

d. "i" and "j"

e. "j" and "k"

5) Consider the following Java statements.
int x = 3;
x = x++;

What is the value x is holding?

a. 0

b. 3

c. 4

d. 5

e. The question is moot. The statements have a syntax error.

6) Consider the following Java method. Which term best describes what this method computes?

static int doSomething(int[] a) {
    int b = 0;
    for (int c : a) b += c;
    return b;
}

a. average

b. maximum

c. minimum

d. sum

e. transpose

7) Consider the following Java method, which term best describes "'("Hello, World!")"?

public static void main(String[] args) {
    System.out.println("Hello, World!");
}

a. actual parameter or argument

b. formal parameter

c. method call

d. modifier

e. return type

8) Consider the following Java method, which term best describes "void"?
public static void main(String[] args) {
    System.out.println("Hello, World!");
}

a. actual parameter or argument

b. formal parameter

c. method call

d. modifier

e. return type

9) What is the output of the following Java program?
class Sum {
    static int sum = 0;
    static void add(int i) { sum += i; }
    public static void main(String[] args) {
        for (int i = 0; i < 10; i++) add(i);
        System.out.println(sum);
    }
}

a. 0

b. 9

c. 10

d. 45

e. 100

10) Consider the following Java program. Which object registers event listeners?
import java.awt.event.*;
import javax.swing.*;
public class MouseWhisperer extends JFrame implements MouseListener {
    MouseWhisperer() {
        super("COME CLOSER");
        setSize(300,100);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        addMouseListener(this);
        setVisible(true);
    }
    public void mouseClicked(MouseEvent e) { setTitle("OUCH"); }
    public void mousePressed(MouseEvent e) { setTitle("LET GO"); }
    public void mouseReleased(MouseEvent e) { setTitle("WHEW"); }
    public void mouseEntered(MouseEvent e) { setTitle("I SEE YOU"); }
    public void mouseExited(MouseEvent e) { setTitle("COME CLOSER"); }
    public static void main(String[] args) { new MouseWhisperer(); }
}

a. java.awt.event

b. JFrame

c. MouseEvent

d. MouseListener

e. this

11) What is the output of the following Java program?
class Food {
    Food() { printFlavor(); }
    void printFlavor() { System.out.println("bland"); }
}
class Pepper extends Food {
    void printFlavor() { System.out.println("spicy"); }
}
public class Lunch {
    public static void main(String[] args) {
        Food lunch = new Pepper();
    }
}

a. bland

b. bland
spicy

c. no output

d. spicy

e. the program does not compile

Answer 1

Question 1 :

Answer :c. minimum

Explanation :

• Given method doSomething() takes integer array as a parameter a[0]
• will consider zeroth element into the array as smallest element that is a[0]
• using if check for any element that is less than b then assign that element to the b and lastly return b

Below screen shows the demonstration

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Question 2 :

Answer :d. a comment

Explanation :

• In Java comment is declared with either // or /**/
• variable declaration starts with any valid data type followed by variable name
• line 3 that is main() is a method
• Line 1 which is class declaration
• and line 4 is valid statement

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Question 3:

Answer :b. [0, 0, 0, 0, 0]

Explanation :

• In java all array elements are initilized with 0

Below screen shows the output

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Question 4:

Answer :a. Only "i"

Explanation :

• Because i is the only variable that is declared before line no 8
• All other variables j, k etc are declared after the line 8 hence which is not available on line 8
• Hence all other options are invalid.

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Question 5:

Answer :b. 3

Explanation :

• In the given code snippet a variable i is declared and initilized with 3
• x=x++; will first assign 3 to the x and the increment will take place because this is post increment.

Below screen shows the output

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Question 6 :

Answer :d. sum

Explanation :

• Given code snippet will take each element from the array a and will add that element and return sum of the all array elements

Below screen shows the demonstration

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Question 7:

Answer :c. method call

Explanation :

• ("Hello, World!") is the method call because parenthesis is used
• "Hello, World!" Actual parameter or arguments are passed when method is called
• Formal parameters are parameters given at the time of method definition
• There is no any return type
• public , private , protected etc are all modifiers

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Question 8:

Answer :e. return type

Explanation :

• void means main() method does not return any thing
• Actual parameter or arguments are passed when method is called
• Formal parameters are parameters given at the time of method definition
• public , private , protected etc are all modifiers

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Question 9:

Answer :d. 45

Explanation :

• Given code snippet will add the value from 1 to 9 which is 45
• variable sum is accessible in main() method because it is declared outside of main() method like globallly

Below screen shows the output

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Question 11:

Answer :d. spicy

Explanation :

Below screen shows the output

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