////////////Eksamiülesanne: Kaido Heinsalu, IF-21



import java.awt.*;
import java.io.*;
import java.applet.Applet;
import java.awt.event.*;


public class Lahutamine extends Panel implements ActionListener, TextListener{
		
		TextField esimVali=new TextField("");
		TextField teinVali=new TextField("");
		Label mark = new Label("-");
		Label infoLab = new Label("");
		Label tyhiLab = new Label("");


		Label ylemLab = new Label("");
		Label alumLab = new Label("");
		Label vastLab = new Label("");
		Button arvuta=new Button("arvuta");


	public Lahutamine(){
		setLayout(new BorderLayout());

		Panel ylaPaneel=new Panel(new GridLayout(1,4));
		ylaPaneel.add(esimVali);
		ylaPaneel.add(mark);
		ylaPaneel.add(teinVali);
		ylaPaneel.add(arvuta);
		add(ylaPaneel, BorderLayout.WEST);

		Panel keskPaneel=new Panel(new GridLayout(1,1));
		keskPaneel.add(infoLab);
		add(keskPaneel, BorderLayout.EAST);

		Panel tyhiPaneel=new Panel(new GridLayout(1,1));
		tyhiPaneel.add(tyhiLab);
		add(tyhiPaneel, BorderLayout.SOUTH);

		esimVali.addTextListener(this);
		arvuta.addActionListener(this);
		
		Panel alaPaneel=new Panel(new GridLayout(3,1));
		alaPaneel.add(ylemLab);
		alaPaneel.add(alumLab);
		alaPaneel.add(vastLab);
		add(alaPaneel, BorderLayout.NORTH);

	 	Panel paremPaneel=new Panel(new GridLayout(1,2));
		paremPaneel.add(ylaPaneel);
		paremPaneel.add(keskPaneel);
		add(paremPaneel, BorderLayout.NORTH);

		Panel vasakPaneel=new Panel(new GridLayout(2,1));
		vasakPaneel.add(alaPaneel);
		//tyhiPaneel.add(alaPaneel);
		add(vasakPaneel, BorderLayout.SOUTH);
		
	}

	public void textValueChanged(TextEvent e){
		if(esimVali.getText().length()==4){
		
		}
	}

	



public void actionPerformed(ActionEvent syndmus){
		int a,b,c;

		try{
			if (syndmus.getSource()==arvuta){
				System.out.println("Nupp töötab!");
				a=Integer.parseInt(esimVali.getText());
				b=Integer.parseInt(teinVali.getText());
				c=a-b;
				if(b > a){
					System.out.println("Tehe korras!");
					ylemLab.setText(teinVali.getText());
					alumLab.setText(esimVali.getText());
					vastLab.setText(""+c);
					System.out.println(c);
				}
				else if(b < a){infoLab.setText("Esimene liige peab olema väiksem!");}
				//else{infoLab.setText("Sisesta arvud!");}
				
			}					
			
			else{}
		}
		catch(Exception erind){System.out.println("Viga!");}

}




	public static void main(String args[]){
		Frame f=new Frame("Arvusüsteem");
		f.add(new Lahutamine());
		f.setSize(500,300);
		f.addWindowListener(new AknaKuulaja());	
		f.setVisible(true);
	}
}



class AknaKuulaja extends WindowAdapter{
	public void windowClosing(WindowEvent e){
		System.out.println("Out of game!");
		System.exit(0);
	}
}