Account.java

import java .awt.* ;
import java.awt.event.* ;
import javax.swing.*;
import static java.lang.Math.abs;
import java.util.Scanner;
import java.util.List;
import java.util.ArrayList;
import javax.swing.event.ChangeEvent;

class Calculations//obliczenia
{
	public int calculate(int n,int m) throws DebetException 
	{
		if((n+m)>=0) 
		{
			return n+m;
		}
		else throw new DebetException(n,m);
	}
}


class DebetException extends Exception //wyjatek
{
	int balance;
	int operation;
	DebetException(int b, int o)
	{
		balance = b;
		operation = o;
	}
	String GetString() 
	{
		return "o " + String.valueOf(abs(balance+operation)+ " za dużo");
	}
}


public class Account extends JFrame
{
	JTextField
    	data  = new JTextField(20),
    	write = new JTextField(20),
    	result = new JTextField(20);
	Calculations cal = new Calculations(); 
	JButton
    	payment = new JButton("Wpłata/Wypłata") ,
    	unlock = new JButton("ODBLOKUJ");
	Account()
	{
		setTitle("Konto Bankowe");
		Container cp = getContentPane();
		cp.setLayout(new GridLayout(5,2,10,10)) ;
		cp.add(new JLabel("Stan:")) ;
		cp.add(data) ;
		data.setEditable(false);
		cp.add(new JLabel(""));//odstep
		cp.add(new JLabel(""));
		payment.addActionListener(new Payments());
		cp.add(payment) ;
		cp.add(write);
		data.setText("0");// inicjal danych
		cp.add(new JLabel("")) ; // odstep
		cp.add(new JLabel("")) ;
		cp.add(result) ;
		unlock.addActionListener(new Unlock());
		cp.add(unlock) ;
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		setVisible(true) ;   
	}
	int GetNumber(JTextField tf)
	{
			return Integer.parseInt(tf.getText()) ;
	}
	class Payments implements ActionListener//wplata/wyplata/lapanie wyjatku
	{
		public void actionPerformed(ActionEvent e)
		{
			unlock.setEnabled(true);
			result.setEnabled(false);
			result.setText("OK");
			try 
			{
				data.setText(Integer.toString(cal.calculate(GetNumber(write),(GetNumber(data))))) ;
			}
			catch(DebetException e1) 
		    {
				result.setText(e1.GetString());
		    }
		    catch(NumberFormatException exc) 
		    {
		    	result.setText("ZLY FORMAT");
		    }
			payment.setEnabled(false);
		 }
	}

class Unlock implements ActionListener //przycisk odblokuj
{
	public void actionPerformed(ActionEvent e)
   	{
		payment.setEnabled(true);
   	}
}
  
  
public static void main(String[] arg)
{
	JFrame gi = new Account() ;
	gi.setSize(400,200) ;
}
}