Question

What is the output of the following Java program?

public class Food {
    static int count;
    private String flavor = "sweet";
    Food() { count++; }
    void setFlavor(String s) { s = flavor; }
    String getFlavor() { return flavor; }
    static public void main(String[] args) {
        Food pepper = new Food();
        pepper.setFlavor("spicy");
        System.out.println(pepper.getFlavor());
    }
}

Select one:

a. sweet

b. 1

c. The program does not compile.

d. 2

e. spicy

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Question 2

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Consider the following Java program, which one of the following best describes "setFlavor"?

public class Food {
    static int count;
    private String flavor = "sweet";
    Food() { count++; }
    void setFlavor(String s) { flavor = s; }
    String getFlavor() { return flavor; }
    static public void main(String[] args) {
        Food pepper = new Food();
        System.out.println(pepper.getFlavor());
    }
}

Select one:

a. a setter method

b. a class method

c. gets executed when the program runs

d. a static method

e. a public method

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Question 3

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What is the output of the following Java program?

abstract class Food {
    void printFlavor() {}
}
class Pepper extends Food {}
public class Lunch {
    public static void main(String[] args) {
        Food lunch = new Pepper();
        lunch.printFlavor();
    }
}

Select one:

a. the program does not compile

b. no output

c. bland

d. spicy

e. bland
spicy

Clear my choice

Question 4

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What is the output of the following Java program?

class Food {
    void flavor() { System.out.println("bland"); }
}
class Pepper extends Food {
    void flavor() { System.out.println("spicy"); }
}
public class Lunch {
    public static void main(String[] args) {
        Pepper lunch = new Food();
        lunch.flavor();
    }
}

Select one:

a. bland
spicy

b. the program does not compile

c. bland

d. no output

e. spicy

Clear my choice

Question 5

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What is the output of the following Java program?

interface Food {
    public void printFlavor();
}
class Pepper implements Food {
    public void printFlavor() { System.out.println("spicy"); }
}
public class Lunch {
    public static void main(String[] args) {
       Food pepper = new Pepper();
        pepper.printFlavor();
    }
}

Select one:

a. the program does not compile

b. bland

c. no output

d. bland
spicy

e. spicy

Clear my choice

Question 6

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What is the output of the following Java program?
public class Food {
    static int count;
    private String flavor = "sweet";
    Food(String s) { flavor = s; }
    void setFlavor(String s) { flavor = s; }
    String getFlavor() { return flavor; }
    static public void main(String[] args) {
        Food pepper = new Food("spicy");
        Food chile = pepper;
        pepper.setFlavor("smoky");
        System.out.println(chile.getFlavor());
    }
}

Select one:

a. spicy

b. false

c. smoky

d. sweet

e. true

Clear my choice

Question 7

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Consider the following Java program. Which one of the following does NOT describe "Clicker"?

import java.awt.event.*;
import javax.swing.*;
public class Clicker extends JFrame implements ActionListener {
    int count;
    JButton button;
    Clicker() {
        super("Click Me");
        button = new JButton(String.valueOf(count));
        add(button);
        button.addActionListener(this);
        setSize(200,100);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }
    public void actionPerformed(ActionEvent e) {
        count++;
        button.setText(String.valueOf(count));
    }
    public static void main(String[] args) { new Clicker(); }
}

Select one:

a. A "Clicker" object responds to button clicks.

b. The "Clicker" class can be run as a program.

c. A "Clicker" object can be assigned to an "ActionEvent" variable.

d. A "Clicker" object can be assigned to an "ActionListener" variable.

e. A "Clicker" object can be assigned to a "JFrame" variable.

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Question 8

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What is the output of the following Java program?

class Food {
    Food() { System.out.println("bland"); }
    Food(String flavor) { System.out.println(flavor); }
}
class Pepper extends Food {
    Pepper() { super("spicy"); }
}
public class Lunch {
    public static void main(String[] args) {
        Food lunch = new Pepper();
    }
}

Select one:

a. bland

b. the program does not compile

c. bland
spicy

d. spicy

e. no output

Clear my choice

Question 9

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What is the output of the following Java program?

public class Food {
    static int count;
    private String flavor = "sweet";
    Food(String s) { flavor = s; }
    void setFlavor(String s) { flavor = s; }
    String getFlavor() { return flavor; }
    static public void main(String[] args) {
        Food pepper = new Food("spicy");
        System.out.println(pepper.getFlavor());
    }
}

Select one:

a. sweet

b. 1

c. 2

d. spicy

e. The program does not compile.

Clear my choice

Question 10

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A subclass will _____ from its superclass.

Select one:

a. inherit

b. extend

c. implement

d. abstract

e. override

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Question 11

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Consider the following Java program. Which object receives events?

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(); }
}

Select one:

a. MouseListener

b. JFrame

c. MouseEvent

d. this

e. java.awt.event

Clear my choice

Question 12

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Which one of the following claims about Java is INCORRECT?

Select one:

a. A constructor's name is its return type.

b. A default constructor is always provided by the compiler.

c. A constructor can only be called with "new".

d. Constructors can be overloaded with different parameter lists.

e. A constructor's name must match the name of the class.

Clear my choice

Question 13

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What is the output of the following Java program?
public class Food {
    static int count;
    private String flavor = "sweet";
    Food(String s) { flavor = s; }
    void setFlavor(String s) { flavor = s; }
    String getFlavor() { return flavor; }
    static public void main(String[] args) {
        Food pepper = new Food("spicy");
        Food chile = new Food("spicy");
        System.out.println(pepper == chile);
    }
}

Select one:

a. true

b. false

c. spicy

d. sweet

e. smoky

Clear my choice

Question 14

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Consider the following Java program. Which line declares an instance object variable?

import java.awt.event.*;
import javax.swing.*;
public class Clicker extends JFrame implements ActionListener {
    int count;
    JButton button;
    Clicker() {
        super("Click Me");
        button = new JButton(String.valueOf(count));
        add(button);
        button.addActionListener(this);
        setSize(200,100);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }
    public void actionPerformed(ActionEvent e) {
        count++;
        button.setText(String.valueOf(count));
    }
    public static void main(String[] args) { new Clicker(); }
}

Select one:

a. button = new JButton(String.valueOf(count));

b. public static void main(String[] args) { new Clicker(); }

c. int count;

d. JButton button;

e. public void actionPerformed(ActionEvent e) {

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Question 15

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Consider the following Java program. Which object registers event listeners?

import java.awt.event.*;
import javax.swing.*;
public class Clicker extends JFrame implements ActionListener {
    int count;
    JButton button;
    Clicker() {
        super("Click Me");
        button = new JButton(String.valueOf(count));
        add(button);
        button.addActionListener(this);
        setSize(200,100);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }
    public void actionPerformed(ActionEvent e) {
        count++;
        button.setText(String.valueOf(count));
    }
    public static void main(String[] args) { new Clicker(); }
}

Select one:

a. e

b. button

c. super

d. count

e. this

Clear my choice

Answer 1

Answer 1:

_{What is the output of the following Java program?
public class Food {
    static int count;
    private String flavor = "sweet";
    Food() { count++; }
    void setFlavor(String s) { s = flavor; }
    String getFlavor() { return flavor; }
    static public void main(String[] args) {
        Food pepper = new Food();
        pepper.setFlavor("spicy");
        System.out.println(pepper.getFlavor());
    }
}}

Correct Answer is Option (a) sweet.

Answer 2:

_{Consider the following Java program, which one of the following best describes "setFlavor"?}

Correct Answer is Option (a) a setter method.

Answer 3:

_{What is the output of the following Java program?
abstract class Food {
    void printFlavor() {}
}
class Pepper extends Food {}
public class Lunch {
    public static void main(String[] args) {
        Food lunch = new Pepper();
        lunch.printFlavor();
    }
}}

Correct Answer is Option (b) No Output.

Answer 4:

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

Correct Answer is Option (b) the program does not compile.

Answer 5:

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

Correct Answer is Option (e) spicy.

Answer 6:

_{What is the output of the following Java program?
public class Food {
    static int count;
    private String flavor = "sweet";
    Food(String s) { flavor = s; }
    void setFlavor(String s) { flavor = s; }
    String getFlavor() { return flavor; }
    static public void main(String[] args) {
        Food pepper = new Food("spicy");
        Food chile = pepper;
        pepper.setFlavor("smoky");
        System.out.println(chile.getFlavor());
    }
}}

Correct Answer is Option (c) smoky.

Answer 7:

_{Consider the following Java program. Which one of the following does NOT describe "Clicker"?}

_{import java.awt.event.*;
import javax.swing.*;
public class Clicker extends JFrame implements ActionListener {
    int count;
    JButton button;
    Clicker() {
        super("Click Me");
        button = new JButton(String.valueOf(count));
        add(button);
        button.addActionListener(this);
        setSize(200,100);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }
    public void actionPerformed(ActionEvent e) {
        count++;
        button.setText(String.valueOf(count));
    }
    public static void main(String[] args) { new Clicker(); }
}}

Correct answer is Option(d) A "Clicker" object can be assigned to an "ActionListener" variable.

Answer 8:

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

Correct answer is option(d) spicy.

Answer 9:

_{What is the output of the following Java program?
public class Food {
    static int count;
    private String flavor = "sweet";
    Food(String s) { flavor = s; }
    void setFlavor(String s) { flavor = s; }
    String getFlavor() { return flavor; }
    static public void main(String[] args) {
        Food pepper = new Food("spicy");
        System.out.println(pepper.getFlavor());
    }
}}

Correct answer is Option(d) spicy

Answer 10:

_{A subclass will inherit from its superclass.}

So correct answer is Option(a) inherit

Answer 11:

_{Consider the following Java program. Which object receives events?
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(); }
}}

Correct Answer is Option(a) MouseListener

Answer 12:

_{Which one of the following claims about Java is INCORRECT?}

Option(a) is incorrect.

So answer is Option(a) A constructor's name is its return type.

Answer 13:

_{What is the output of the following Java program?
public class Food {
    static int count;
    private String flavor = "sweet";
    Food(String s) { flavor = s; }
    void setFlavor(String s) { flavor = s; }
    String getFlavor() { return flavor; }
    static public void main(String[] args) {
        Food pepper = new Food("spicy");
        Food chile = new Food("spicy");
        System.out.println(pepper == chile);
    }
}}

Correct Answer is Option(b) false.

Answer 14:

_{Consider the following Java program. Which line declares an instance object variable?}

_{import java.awt.event.*;
import javax.swing.*;
public class Clicker extends JFrame implements ActionListener {
    int count;
    JButton button;
    Clicker() {
        super("Click Me");
        button = new JButton(String.valueOf(count));
        add(button);
        button.addActionListener(this);
        setSize(200,100);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }
    public void actionPerformed(ActionEvent e) {
        count++;
        button.setText(String.valueOf(count));
    }
    public static void main(String[] args) { new Clicker(); }
}}

Correct Answer is Option(d) JButton button;

Answer 15:

_{Consider the following Java program. Which object registers event listeners?}

_{import java.awt.event.*;
import javax.swing.*;
public class Clicker extends JFrame implements ActionListener {
    int count;
    JButton button;
    Clicker() {
        super("Click Me");
        button = new JButton(String.valueOf(count));
        add(button);
        button.addActionListener(this);
        setSize(200,100);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setVisible(true);
    }
    public void actionPerformed(ActionEvent e) {
        count++;
        button.setText(String.valueOf(count));
    }
    public static void main(String[] args) { new Clicker(); }
}}

Correct Answer is Option(e) this.