Java calculator using GUI-javax.swing

[ogret]

Can anyone help me with this java code written in Netbeans?!Something is not working properly ,but I can not understand which part….

import javax.swing.JOptionPane;
public class GuiCalculator
{
private int choice;

public GuiCalculator(int choiceAction)
{
choice=choiceAction;
}
public void setChoice(int choiceAction)
{
choice=choiceAction;
}
public int getChoice()
{
return choice;
}

public void Calculate()
{
GuiCalculator action=new GuiCalculator(-1);
String firstNumber;
String secondNumber;
double num1;
double num2;
double result;

String messagee=String.format("\n\n%-25s\n%-25s%-25s%-25s\n%-24s%-28s%-25s\n%-27s%-29s%-27s\n\n%s","Menu of calculator :","1->Addition","2->Multiplication","3->Division","4->Subtraction","5->Power","6->Sin","7->Cos","8->Log","-1->Exit","Choose an action :");
JOptionPane.showInputDialog(null,messagee);

action.setChoice(Integer.parseInt(messagee));

if (action.getChoice()!=-1)
{

switch(action.getChoice())
{
case 1:
firstNumber=JOptionPane.showInputDialog("Enter the first number :");
secondNumber=JOptionPane.showInputDialog("Enter the second number :");
num1=Double.parseDouble(firstNumber);
num2=Double.parseDouble(secondNumber);
result=num1+num2;
String message=String.format("The addition is %.2f.", result);
JOptionPane.showMessageDialog(null,message);
break;
case 2:
firstNumber=JOptionPane.showInputDialog("Enter the first number :");
secondNumber=JOptionPane.showInputDialog("Enter the second number :");
num1=Double.parseDouble(firstNumber);
num2=Double.parseDouble(secondNumber);
result=num1*num2;
String message1=String.format("The multiplication is %.2f", result);
JOptionPane.showMessageDialog(null,message1);
break;
case 3:
firstNumber=JOptionPane.showInputDialog("Enter the first number :");
secondNumber=JOptionPane.showInputDialog("Enter the second number :");
num1=Double.parseDouble(firstNumber);
num2=Double.parseDouble(secondNumber);
if (num2==0)
{
String message3=String.format("Incorrect operation.");
JOptionPane.showMessageDialog(null,message3);
}
else
{
result=num1/num2;
String message4=String.format("The division is %.2f", result);
JOptionPane.showMessageDialog(null,message4);
}
break;
case 4:
firstNumber=JOptionPane.showInputDialog("Enter the first number :");
secondNumber=JOptionPane.showInputDialog("Enter the second number :");
num1=Double.parseDouble(firstNumber);
num2=Double.parseDouble(secondNumber);
result=num1-num2;
String message5=String.format("The substraction is %.2f", result);
JOptionPane.showMessageDialog(null,message5);
break;
case 5:
firstNumber=JOptionPane.showInputDialog("Enter the first number :");
secondNumber=JOptionPane.showInputDialog("Enter the second number :");
num1=Double.parseDouble(firstNumber);
num2=Double.parseDouble(secondNumber);
String number=JOptionPane.showInputDialog("If you want the first number raised to the power of second number press 1."+"If you want the second number raised to the power of first number press 2.\n");
int yourChoice=Integer.parseInt(number);
if (yourChoice==1)
{
result=Math.pow(num1,num2);
String message6=String.format("The power is %.2f", result);
JOptionPane.showMessageDialog(null,message6);
}
else
{
result=Math.pow(num2,num1);
String message7=String.format("The power is %.2f", result);
JOptionPane.showMessageDialog(null,message7);
}
break;
case 6:
firstNumber=JOptionPane.showInputDialog("Enter the number :");
num1=Double.parseDouble(firstNumber);
result=Math.sin(num1);
String message8=String.format("The sin is %.2f", result);
JOptionPane.showMessageDialog(null,message8);
break;
case 7:
firstNumber=JOptionPane.showInputDialog("Enter the number :");
num1=Double.parseDouble(firstNumber);
result=Math.cos(num1);
String message9=String.format("The cos is %.2f", result);
JOptionPane.showMessageDialog(null,message9);
break;
case 8:
firstNumber=JOptionPane.showInputDialog("Enter the number :");
num1=Double.parseDouble(firstNumber);
if (num1<0)
{
String message11=String.format("Incorrect operation.");
JOptionPane.showMessageDialog(null,message11);
}
else
{
result=Math.log(num1);
String message12=String.format("The natyral logarithm of %.2f is %.2f",firstNumber, result);
JOptionPane.showMessageDialog(null,message12);

}
break;
default:
}
}
}
}



The other file is :

public class GuiCalculatorTest
{
public static void main (String[] args)
{
GuiCalculator myCalculator=new GuiCalculator(0);
myCalculator.Calculate();


}

}

[JAMES_911]

At the time you are adding or removing or changing a Java GUI, then you will have to call invalidate() or revalidate() to let java re-create the GUI. Check if calling invalidate() before setVisible(true) solves the issue or not.

[ogret]

At the time you are adding or removing or changing a Java GUI, then you will have to call invalidate() or revalidate() to let java re-create the GUI. Check if calling invalidate() before setVisible(true) solves the issue or not.

I have to create the calculator by using only java.swing in this form:
Develop a program via GUI.
Use an object-oriented approach to separate the functions of the calculator from the GUI.
Develop the following:
Show the menu in a window where the user can insert the choice in a textfield.
Once the user makes the choice, show windows to read the values from the user.
Show the result of the operation in a window
Show again the main menu window