Question

Create a simple calculator. Your interface should contain two input boxes in which the user can put two numbers. There should be four buttons: add, subtract, multiply, and divide. When the user inputs two number and clicks on an operation button, the result should be displayed in the label.

Can some please help my code that i came up with just displays a pop box with no words or nothing! I'm not the best at coding. Any tips or advice would be greatly appreciated.

My source code:

package java applicationcalculator;

/**
*
* @author vancarlosjackson
*
*
*/
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class Calculator extends Applet implements ActionListener{
  

Label Num1 = new Label("Enter first number:");
Label Num2 = new Label("Enter second number:");
TextField First = new TextField("",0);
TextField Second = new TextField("",0);
TextField Answer = new TextField("",30);
Font MyFont = new Font("TimesRoman", Font.BOLD,12);
Button ButtAdd = new Button("Add");
Button ButtMinus = new Button("Subtract");
Button ButtMultiple = new Button("Multiply");
Button ButtDivide = new Button("Divide");

public void init(){
  
add(Num1);
add(First);
add(Second);
add(Answer);
ButtAdd.addActionListener(this);
ButtMinus.addActionListener(this);
ButtMultiple.addActionListener(this);
ButtDivide.addActionListener(this);
First.requestFocus();
  
}
public void actionPerformed(ActionEvent e){
String s = e.getActionCommand();

if ("ButAdd".equals(s))
{
Integer Result = Integer.parseInt(First.getText()) + Integer.
parseInt(Second.getText()); Answer.setLocation(10,100);
Answer.setText("The result for added two numbers is: +"
+ "Answer");

}
else if ("ButtMinus".equals(s)){
Integer Result = Integer.parseInt(First.getText())-Integer.parseInt
(Second.getText()); Answer.setLocation(10,100);
Answer.setText("The result for multiplied two number is:"
+ Answer);
}
else if ("ButtMultiple".equals(s)){
Integer Result = Integer.parseInt(First.getText()) * Integer.parseInt
(Second.getText()); Answer.setLocation(10,100);
Answer.setText("The result for multiplied two numbers is:" +
Answer);

}
else if("ButtDivide".equals(s)){
Integer Results = Integer.parseInt(First.getText())/Integer.
parseInt(Second.getText());
Answer.setLocation(10,100);
Answer.setText("The result for divided two number is"+ Answer);

}

Answer 1

/**

* Modified Calculator.java program

* The java program prompts user to enter two integer values

* in two text boxes and then allows to click any buttons of user

* choice for add,subtract, divide and multiplicaiton.

* Then find the result and display,

* */

//Calculator.java

import java.applet.*;

import java.awt.*;

import java.awt.event.*;

import java.util.*;

public class Calculator extends Applet implements ActionListener

{

private Label Num1 = new Label("Enter first number:");

private Label Num2 = new Label("Enter second number:");

private TextField First = new TextField("",0);

private TextField Second = new TextField("",0);

private TextField Answer = new TextField("",50);

private Font MyFont = new Font("TimesRoman", Font.BOLD,12);

private Button ButtAdd = new Button("Add");

private Button ButtMinus = new Button("Subtract");

private Button ButtMultiple = new Button("Multiply");

private Button ButtDivide = new Button("Divide");

public void init()

{

add(Num1);

add(First);

add(Num2);

add(Second);

add(Answer);

//Add add,subtract ,multiplication and division buttons

add(ButtAdd);

add(ButtMinus);

add(ButtMultiple);

add(ButtDivide);

add(Answer);

ButtAdd.addActionListener(this);

ButtMinus.addActionListener(this);

ButtMultiple.addActionListener(this);

ButtDivide.addActionListener(this);

First.requestFocus();

}

/*Override the actionPerformed method*/

public void actionPerformed(ActionEvent e){

//call getSource method to get the source of user button click

Object s = e.getSource();

//Check if object,s is add button

if (s.equals(ButtAdd))

{

Integer Result = Integer.parseInt(First.getText()) + Integer.parseInt(Second.getText());

Answer.setLocation(10,100);

Answer.setText("The result for added two numbers is: "+ Result);

}

//Check if object,s is minus button

else if (s.equals(ButtMinus)){

Integer Result = Integer.parseInt(First.getText())-Integer.parseInt

(Second.getText()); Answer.setLocation(10,100);

Answer.setText("The result for multiplied two number is:"

+ Result);

}

//Check if object,s is multiple button

else if (s.equals(ButtMultiple)){

Integer Result = Integer.parseInt(First.getText()) * Integer.parseInt

(Second.getText()); Answer.setLocation(10,100);

Answer.setText("The result for multiplied two numbers is:" +

Result);

}

//Check if object,s is divide button

else if(s.equals(ButtDivide)){

Integer Result = Integer.parseInt(First.getText())/Integer.

parseInt(Second.getText());

Answer.setLocation(10,100);

Answer.setText("The result for divided two number is"+ Result);

}

} //end of actionPerformed

}//end of class,Calculator

Sample Output: