Question

Integer Math
Create an application that uses random integers to test the user’s knowledge of arithmetic. Let the user choose from addition, subtraction, multiplication, and division. The integers used in the problems should range from 20 to 120. When giving feedback, use color to differentiate between a correct answer response, versus an incorrect answer response. Also check for non-integer input. Preparing division problems requires special consideration because the quotient must be an integer. Therefore, you can use a loop to generate new random values for the second operand until you find one that divides the first operand evenly. Use the Mod operator to verify that the integer division remainder is zero.

Answer 1

package GUI;

import java.awt.*;

import java.awt.event.*;

import java.util.*;

import javax.swing.*;

// Class IntegerMath definition

public class IntegerMath

{

// Declares component and container

JFrame jf;

JRadioButton addRB, subRB, mulRB, divRB;

ButtonGroup bg;

JLabel expressionL;

JTextField resultT;

JButton checkB, exitB, nextB;

JPanel jp1, jp2, jp3, mainP;

// To store the random numbers generated

int no1, no2;

// Default constructor definition

IntegerMath()

{

// Component and container created

jf = new JFrame("Math Test");

addRB = new JRadioButton("Addition", true);

subRB = new JRadioButton("Subtraction");

mulRB = new JRadioButton("Multiplication");

divRB = new JRadioButton("Division");

bg = new ButtonGroup();

bg.add(addRB);

bg.add(subRB);

bg.add(mulRB);

bg.add(divRB);

expressionL = new JLabel();

resultT = new JTextField(10);

checkB = new JButton("CHECK");

exitB = new JButton("EXIT");

nextB = new JButton("NEXT");

jp1 = new JPanel();

jp2 = new JPanel();

jp3 = new JPanel();

mainP = new JPanel();

// Adds the components to panels

jp1.add(addRB);

jp1.add(subRB);

jp1.add(mulRB);

jp1.add(divRB);

// Sets the layout to 4 row and 1 column

jp1.setLayout(new GridLayout(4, 1));

jp2.add(expressionL);

jp2.add(resultT);

jp3.add(checkB);

jp3.add(nextB);

jp3.add(exitB);

// Adds the panels to main panel

mainP.add(jp1);

mainP.add(jp2);

mainP.add(jp3);

// Sets the layout to 3 row and 1 column

mainP.setLayout(new GridLayout(3, 1));

// Adds the main panel to frame

jf.add(mainP);

// Sets the frame property

jf.setVisible(true);

jf.setLocationRelativeTo(null);

jf.pack();

// Calls the method to generate expression and sets it to expression label

// 1 for addition

expressionL.setText(getExpression(1));

// Registers action listener to check button using anonymous class

checkB.addActionListener(new ActionListener()

{

// Overrides the actionPerformed() method

public void actionPerformed(ActionEvent ae)

{

// Checks if add radio button selected

if(addRB.isSelected())

{

// Checks if addition of two numbers is equals to the

// number entered by the user

if(no1 + no2 == Integer.parseInt(resultT.getText()))

{

JOptionPane.showMessageDialog(null, "Correct Answer");

// Sets the back ground color to yellow

resultT.setBackground(Color.YELLOW);

}// End of if condition

// Otherwise wrong answer

else

{

// Displays the correct answer

JOptionPane.showMessageDialog(null, "Wrong Answer Correct Answer: "

+ (no1 + no2));

// Sets the back ground color to red

resultT.setBackground(Color.RED);

}// End of else

}// End of if condition

// Otherwise checks if subtract radio button selected

else if(subRB.isSelected())

{

// Checks if subtraction of two numbers is equals to the

// number entered by the user

if(no1 - no2 == Integer.parseInt(resultT.getText()))

{

JOptionPane.showMessageDialog(null, "Correct Answer");

// Sets the back ground color to yellow

resultT.setBackground(Color.YELLOW);

}// End of if condition

// Otherwise wrong answer

else

{

// Displays the correct answer

JOptionPane.showMessageDialog(null, "Wrong Answer Correct Answer: "

+ (no1 - no2));

// Sets the back ground color to red

resultT.setBackground(Color.RED);

}// End of else

}// End of if condition

// Otherwise checks if multiplication radio button selected

else if(mulRB.isSelected())

{

// Checks if multiplication of two numbers is equals to the

// number entered by the user

if(no1 * no2 == Integer.parseInt(resultT.getText()))

{

JOptionPane.showMessageDialog(null, "Correct Answer");

// Sets the back ground color to yellow

resultT.setBackground(Color.YELLOW);

}// End of if condition

// Otherwise wrong answer

else

{

// Displays the correct answer

JOptionPane.showMessageDialog(null, "Wrong Answer Correct Answer: "

+ (no1 * no2));

// Sets the back ground color to red

resultT.setBackground(Color.RED);

}// End of else

}// End of if condition

// Otherwise division radio button selected

else

{

// Checks if division of two numbers is equals to the

// number entered by the user

if(no1 / no2 == Integer.parseInt(resultT.getText()))

{

JOptionPane.showMessageDialog(null, "Correct Answer");

// Sets the back ground color to yellow

resultT.setBackground(Color.YELLOW);

}// End of if condition

// Otherwise wrong answer

else

{

// Displays the correct answer

JOptionPane.showMessageDialog(null, "Wrong Answer Correct Answer: "

+ (no1 / no2));

// Sets the back ground color to red

resultT.setBackground(Color.RED);

}// End of else

}// End of else

}// End of method

});// End of anonymous class

// Registers action listener to next button using anonymous class

nextB.addActionListener(new ActionListener()

{

// Overrides the actionPerformed() method

public void actionPerformed(ActionEvent ae)

{

// Sets the back ground color to white

resultT.setBackground(Color.WHITE);

// Reset the text to null

resultT.setText("");

// Checks if add radio button selected

if(addRB.isSelected())

// Calls the method to generate expression and sets it to expression label

// 1 for addition

expressionL.setText(getExpression(1));

// Otherwise checks if subtract radio button selected

else if(subRB.isSelected())

// Calls the method to generate expression and sets it to expression label

// 2 for subtraction

expressionL.setText(getExpression(2));

// Otherwise checks if multiplication radio button selected

else if(mulRB.isSelected())

// Calls the method to generate expression and sets it to expression label

// 3 for multiplication

expressionL.setText(getExpression(3));

// Otherwise division radio button selected

else

// Calls the method to generate expression and sets it to expression label

// 4 for division

expressionL.setText(getExpression(4));

}// End of method

});// End of anonymous class

// Registers action listener to exit button using anonymous class

exitB.addActionListener(new ActionListener()

{

// Overrides the actionPerformed() method

public void actionPerformed(ActionEvent ae)

{

System.exit(0);

}// End of method

});// End of anonymous class

}// End of default constructor

// Method to generate an expression and returns it

String getExpression(int ch)

{

// To store expression

String exp = "";

// To store operator

String opt = "";

// Checks if parameter ch is 1 then set the operator to "+"

if(ch == 1)

opt = "+";

// Otherwise checks if parameter ch is 2 then set the operator to "-"

else if(ch == 2)

opt = "-";

// Otherwise checks if parameter ch is 3 then set the operator to "X"

else if(ch == 3)

opt = "X";

// Otherwise ch is 3 then set the operator to "/"

else

opt = "/";

// Calls the method to generate random numbers

no1 = getRandomNumber();

no2 = getRandomNumber();

// Generates the expression

exp += no1 + " " + opt + " " + no2;

// Returns the expression

return exp;

}// End of method

// Method to generate random number between 20 and 120 and returns it

int getRandomNumber()

{

// Random class object created

Random rand = new Random();

// Generates random number and returns it

return (rand.nextInt(120 - 20) + 20);

}// End of method

// main method definition

public static void main(String ss[])

{

// anonymous object to call default constructor

new IntegerMath();

}// End of main method

}// End of class

Sample Output: