import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import javax.swing.event.*;
import java.util.*;
import javax.swing.JApplet.*;
import java.applet.*;


public class Calculadora extends JApplet
{
    boolean novo = true, ComSinal = false;
    JLabel display = new JLabel ("0");
    JLabel label0,label1,label2,label3,label4,label5,label6,label7,label8,label9;
    Stack pilha = new Stack();
    JLabel titulo = new JLabel ("               CALCULADORA POLONESA - POR FÁBIO MATOS");
    Container base = getContentPane();
    double valor1, valor2;
    int QtLista = 1,TotLabel=10,i,k;
    
    public void init()
    {
       
        base.setLayout(new BorderLayout());
        base.setBackground(Color.blue);
        JPanel PainelBotoes = new JPanel();
        JPanel PainelEdit = new JPanel();
        JPanel PainelOp = new JPanel();
        JPanel PainelLista = new JPanel();
        
        //Definindo Borda
        PainelBotoes.setBorder(BorderFactory.createMatteBorder(1,1,0,1,Color.blue));
        PainelOp.setBorder(BorderFactory.createMatteBorder(1,1,1,1,Color.blue));
        PainelEdit.setBorder(BorderFactory.createMatteBorder(1,0,0,1,Color.blue));
        titulo.setBorder(BorderFactory.createMatteBorder(2,2,2,2,Color.blue));
        PainelLista.setBorder(BorderFactory.createMatteBorder(1,1,1,1,Color.blue));
        
        display.disable();
        display.setForeground(Color.white);
        titulo.setBackground(Color.blue);
        titulo.setForeground(Color.white);
        
        
        //Escolhendo os Layouts
        PainelEdit.setLayout(new BorderLayout(20,20));
        PainelOp.setLayout(new FlowLayout());
        PainelBotoes.setLayout (new GridLayout(4,4));
        PainelLista.setLayout (new GridLayout(TotLabel,1));
        
        PainelLista.setBackground(Color.white);
        PainelOp.setBackground(Color.blue);
        
        //Define Lista de Exibicao
        label0 = new JLabel(" Operações Realizadas ");
        label0.setForeground(Color.black);
        PainelLista.add(label0);
        label1 = new JLabel("  ");
        label1.setForeground(Color.black);
        PainelLista.add(label1);
        label2 = new JLabel("  ");
        label2.setForeground(Color.black);
        PainelLista.add(label2);
        label3 = new JLabel("  ");
        label3.setForeground(Color.black);
        PainelLista.add(label3);
        label4 = new JLabel("  ");
        label4.setForeground(Color.black);
        PainelLista.add(label4);
        label5 = new JLabel("");
        label5.setForeground(Color.black);
        PainelLista.add(label5);
        label6 = new JLabel("  ");
        label6.setForeground(Color.black);
        PainelLista.add(label6);
        label7 = new JLabel("  ");
        label7.setForeground(Color.black);
        PainelLista.add(label7);
        label8 = new JLabel("  ");
        label8.setForeground(Color.black);
        PainelLista.add(label8);
        label9 = new JLabel("  ");
        label9.setForeground(Color.black);
        PainelLista.add(label9);
            
        PainelEdit.add(display,BorderLayout.NORTH);
        PainelEdit.add(PainelLista,BorderLayout.CENTER);

        //Botoes
        JButton limpa,entra,sinal,zero,um,dois,tres,quatro,cinco,seis,sete;
        JButton oito, nove, mais, menos, igual, vezes, dividir,ponto;
        
        limpa=new JButton("Limpa");  PainelOp.add(limpa);
        entra= new JButton("Entra"); PainelOp.add(entra);
        sinal=new JButton("+/-");    PainelOp.add(sinal);
        sete = new JButton("7");     PainelBotoes.add(sete);
        oito = new JButton("8");     PainelBotoes.add(oito);
        nove = new JButton("9");     PainelBotoes.add(nove);
        vezes = new JButton("X");    PainelBotoes.add(vezes);
        quatro = new JButton("4");   PainelBotoes.add(quatro);
        cinco = new JButton("5");    PainelBotoes.add(cinco);
        seis = new JButton("6");     PainelBotoes.add(seis);
        dividir = new JButton("/");  PainelBotoes.add(dividir);
        um = new JButton("1");       PainelBotoes.add(um);
        dois = new JButton("2");     PainelBotoes.add(dois);
        tres = new JButton("3");     PainelBotoes.add(tres);
        menos = new JButton("-");    PainelBotoes.add(menos);
        zero = new JButton("0");     PainelBotoes.add(zero);
        ponto = new JButton(".");    PainelBotoes.add(ponto);
        igual = new JButton("=");    PainelBotoes.add(igual);
        mais = new JButton("+");     PainelBotoes.add(mais);
     
        base.add(titulo,BorderLayout.NORTH);
        base.add(PainelOp,BorderLayout.SOUTH);
        base.add(PainelEdit,BorderLayout.EAST);
        base.add(PainelBotoes,BorderLayout.CENTER);

//Eventos
        limpa.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev){
                novo=true;ComSinal=false;
                display.setText("0");
                QtLista=1;
                
                if (pilha.isEmpty() == false)
                {
                    pilha.removeAllElements();
                }
                   label1.setText(" ");
                   label2.setText(" ");
                   label3.setText(" ");
                   label4.setText(" ");
                   label5.setText(" ");
                   label6.setText(" ");
                   label7.setText(" ");
                   label8.setText(" ");
                   label9.setText(" ");

            }});
        entra.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev){
               
               pilha.push(new Double(display.getText()));
               novo = true;ComSinal=false;
               switch (QtLista)
               {
                   case 1: label1.setText(display.getText());break;
                   case 2: label2.setText(display.getText());break;
                   case 3: label3.setText(display.getText());break;
                   case 4: label4.setText(display.getText());break;
                   case 5: label5.setText(display.getText());break;
                   case 6: label6.setText(display.getText());break;
                   case 7: label7.setText(display.getText());break;
                   case 8: label8.setText(display.getText());break;
                   case 9: label9.setText(display.getText());break;
                   default: QtLista=0;break;
               }
               QtLista++;display.setText("0");
             }});

        zero.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev) {
                JButton temp = (JButton)ev.getSource();
                if (novo)
                {
                   display.setText(temp.getText());
                   novo = false;
                } 
                else
                    display.setText(display.getText() +temp.getText());
             }});

        um.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev) {
                JButton temp = (JButton)ev.getSource();
                if (novo)
                {
                   display.setText(temp.getText());
                   novo = false;
                } 
                else
                    display.setText(display.getText() +temp.getText());
             }});
        
        dois.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev) {
                JButton temp = (JButton)ev.getSource();
                if (novo)
                {
                   display.setText(temp.getText());
                   novo = false;
                } 
                else
                    display.setText(display.getText() +temp.getText());
             }});

        tres.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev) {
                JButton temp = (JButton)ev.getSource();
                if (novo)
                {
                   display.setText(temp.getText());
                   novo = false;
                } 
                else
                    display.setText(display.getText() +temp.getText());
             }});
        quatro.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev) {
                JButton temp = (JButton)ev.getSource();
                if (novo)
                {
                   display.setText(temp.getText());
                   novo = false;
                } 
                else
                    display.setText(display.getText() +temp.getText());
             }});
        cinco.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev) {
                JButton temp = (JButton)ev.getSource();
                if (novo)
                {
                   display.setText(temp.getText());
                   novo = false;
                } 
                else
                    display.setText(display.getText() +temp.getText());
             }});
        seis.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev) {
                JButton temp = (JButton)ev.getSource();
                if (novo)
                {
                   display.setText(temp.getText());
                   novo = false;
                } 
                else
                    display.setText(display.getText() +temp.getText());
             }});
        sete.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev) {
                JButton temp = (JButton)ev.getSource();
                if (novo)
                {
                   display.setText(temp.getText());
                   novo = false;
                } 
                else
                    display.setText(display.getText() +temp.getText());
             }});
        oito.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev) {
                JButton temp = (JButton)ev.getSource();
                if (novo)
                {
                   display.setText(temp.getText());
                   novo = false;
                } 
                else
                    display.setText(display.getText() +temp.getText());
             }});
        nove.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev) {
                JButton temp = (JButton)ev.getSource();
                if (novo)
                {
                   display.setText(temp.getText());
                   novo = false;
                } 
                else
                    display.setText(display.getText() +temp.getText());
             }});
        ponto.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev) {
                JButton temp = (JButton)ev.getSource();
                if (novo)
                {
                   display.setText(temp.getText());
                   novo = false;
                } 
                else
                    display.setText(display.getText() +temp.getText());
            }});
        sinal.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev) {
                JButton temp = (JButton)ev.getSource();
                String s = display.getText();
                
                if (novo)
                {
                   display.setText("-");
                   ComSinal = true;
                   novo = false;
                } 
                else
                {
                    if (ComSinal)
                    {
                        display.setText("");
                        for (i=1;i<s.length();i++)
                        {
                            display.setText(display.getText() + s.substring(i,i+1));
                        }
                            
                        ComSinal=false;
                    }
                    else
                    {
                        display.setText("-");
                        for (i=0;i<s.length();i++)
                        {
                            display.setText(display.getText() + s.substring(i));
                        }
                        ComSinal=true;
                    }
                }
             }});
        mais.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev) {
                JButton temp = (JButton)ev.getSource();
               if (!novo) 
                 pilha.push(new Double(display.getText()));
               if (!pilha.empty())  
                 valor1 =((Double) pilha.pop()).doubleValue();
               if (!pilha.empty())
                 valor2 =((Double) pilha.pop()).doubleValue();
            
               novo = true; ComSinal=false;
             
               display.setText(String.valueOf(valor1 + valor2));
               pilha.push(new Double(display.getText()));
               
               switch (QtLista)
               {
                   case 1: label1.setText(display.getText());break;
                   case 2: label2.setText(display.getText());break;
                   case 3: label3.setText(display.getText());break;
                   case 4: label4.setText(display.getText());break;
                   case 5: label5.setText(display.getText());break;
                   case 6: label6.setText(display.getText());break;
                   case 7: label7.setText(display.getText());break;
                   case 8: label8.setText(display.getText());break;
                   case 9: label9.setText(display.getText());break;
                   default: QtLista=0;break;
               }
               QtLista++;
            }});
        menos.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev) {
                JButton temp = (JButton)ev.getSource();
               if (!novo) 
                 pilha.push(new Double(display.getText()));
               if (!pilha.empty())  
                 valor1 =((Double) pilha.pop()).doubleValue();
               if (!pilha.empty())
                 valor2 =((Double) pilha.pop()).doubleValue();
            
               novo = true; ComSinal=false;
             
               display.setText(String.valueOf(valor1 - valor2));
               pilha.push(new Double(display.getText()));
               
               switch (QtLista)
               {
                   case 1: label1.setText(display.getText());break;
                   case 2: label2.setText(display.getText());break;
                   case 3: label3.setText(display.getText());break;
                   case 4: label4.setText(display.getText());break;
                   case 5: label5.setText(display.getText());break;
                   case 6: label6.setText(display.getText());break;
                   case 7: label7.setText(display.getText());break;
                   case 8: label8.setText(display.getText());break;
                   case 9: label9.setText(display.getText());break;
                   default: QtLista=0;break;
               }
               QtLista++;
            }});
        vezes.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev) {
                JButton temp = (JButton)ev.getSource();
               if (!novo) 
                 pilha.push(new Double(display.getText()));
               if (!pilha.empty())  
                 valor1 =((Double) pilha.pop()).doubleValue();
               if (!pilha.empty())
                 valor2 =((Double) pilha.pop()).doubleValue();
            
               novo = true; ComSinal=false;
             
               display.setText(String.valueOf(valor1 * valor2));
               pilha.push(new Double(display.getText()));
               
               switch (QtLista)
               {
                   case 1: label1.setText(display.getText());break;
                   case 2: label2.setText(display.getText());break;
                   case 3: label3.setText(display.getText());break;
                   case 4: label4.setText(display.getText());break;
                   case 5: label5.setText(display.getText());break;
                   case 6: label6.setText(display.getText());break;
                   case 7: label7.setText(display.getText());break;
                   case 8: label8.setText(display.getText());break;
                   case 9: label9.setText(display.getText());break;
                   default: QtLista=0;break;
               }
               QtLista++;
            }});
        dividir.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent ev) {
                JButton temp = (JButton)ev.getSource();
               if (!novo) 
                 pilha.push(new Double(display.getText()));
               if (!pilha.empty())  
                 valor1 =((Double) pilha.pop()).doubleValue();
               if (!pilha.empty())
                 valor2 =((Double) pilha.pop()).doubleValue();
            
               novo = true; ComSinal=false;
             
               display.setText(String.valueOf(valor1 / valor2));
               pilha.push(new Double(display.getText()));
               
               switch (QtLista)
               {
                   case 1: label1.setText(display.getText());break;
                   case 2: label2.setText(display.getText());break;
                   case 3: label3.setText(display.getText());break;
                   case 4: label4.setText(display.getText());break;
                   case 5: label5.setText(display.getText());break;
                   case 6: label6.setText(display.getText());break;
                   case 7: label7.setText(display.getText());break;
                   case 8: label8.setText(display.getText());break;
                   case 9: label9.setText(display.getText());break;
                   default: QtLista=0;break;
               }
               QtLista++;
            }});

    }
}