Discussoes de Programacao e Tecnologia

Calculadora Java Quase 100%

2 respostas
Marchiore
Marchiore

Estou Iniciando na programação em Java e gostaria de uma ajuda. Estou fazendo uma calculadora no Netbeans 6.8.

- Criei um novo Projeto;
- Adicionei um JFrame;
- Fui modificando o código(eventos do botão);

O modo que estou fazendo está Correto?

As operações estão ok, o único problema é o botão igual (bIgual), pois não sei como implementa-lo... Segue abaixo o código do JFrame... 
package Frames;

public class InterfaceCalc extends javax.swing.JFrame {

    public InterfaceCalc() {
        initComponents();
    }

String Digitos = "";
String Adds;
Boolean flag = true;
double Convertido1 = 0, Convertido2 = 0, Resultado;
String ResultadoString;


    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">                          
    private void initComponents() {

        jToggleButton1 = new javax.swing.JToggleButton();
        bNro1 = new javax.swing.JButton();
        bNro3 = new javax.swing.JButton();
        bNro2 = new javax.swing.JButton();
        bSubtracao = new javax.swing.JButton();
        bNro4 = new javax.swing.JButton();
        bNro5 = new javax.swing.JButton();
        bNro6 = new javax.swing.JButton();
        bMultiplicacao = new javax.swing.JButton();
        bNro7 = new javax.swing.JButton();
        bNro8 = new javax.swing.JButton();
        bNro9 = new javax.swing.JButton();
        bDivisao = new javax.swing.JButton();
        bVirgula = new javax.swing.JButton();
        bNro0 = new javax.swing.JButton();
        bSoma = new javax.swing.JButton();
        bIgual = new javax.swing.JButton();
        lDisplay = new javax.swing.JLabel();
        bC = new javax.swing.JButton();

        jToggleButton1.setText("jToggleButton1");

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        bNro1.setText("1");
        bNro1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bNro1ActionPerformed(evt);
            }
        });

        bNro3.setText("3");
        bNro3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bNro3ActionPerformed(evt);
            }
        });

        bNro2.setText("2");
        bNro2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bNro2ActionPerformed(evt);
            }
        });

        bSubtracao.setText("-");
        bSubtracao.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bSubtracaoActionPerformed(evt);
            }
        });

        bNro4.setText("4");
        bNro4.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bNro4ActionPerformed(evt);
            }
        });

        bNro5.setText("5");
        bNro5.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bNro5ActionPerformed(evt);
            }
        });

        bNro6.setText("6");
        bNro6.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bNro6ActionPerformed(evt);
            }
        });

        bMultiplicacao.setText("*");
        bMultiplicacao.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bMultiplicacaoActionPerformed(evt);
            }
        });

        bNro7.setText("7");
        bNro7.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bNro7ActionPerformed(evt);
            }
        });

        bNro8.setText("8");
        bNro8.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bNro8ActionPerformed(evt);
            }
        });

        bNro9.setText("9");
        bNro9.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bNro9ActionPerformed(evt);
            }
        });

        bDivisao.setText("/");
        bDivisao.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bDivisaoActionPerformed(evt);
            }
        });

        bVirgula.setText(",");
        bVirgula.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bVirgulaActionPerformed(evt);
            }
        });

        bNro0.setText("0");
        bNro0.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bNro0ActionPerformed(evt);
            }
        });

        bSoma.setText("+");
        bSoma.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bSomaActionPerformed(evt);
            }
        });

        bIgual.setText("=");
        bIgual.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bIgualActionPerformed(evt);
            }
        });

        lDisplay.setBackground(new java.awt.Color(255, 255, 255));
        lDisplay.setFont(new java.awt.Font("Tahoma", 0, 18)); // NOI18N
        lDisplay.setBorder(javax.swing.BorderFactory.createEtchedBorder());

        bC.setText("C");
        bC.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bCActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addComponent(lDisplay, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 176, Short.MAX_VALUE)
                    .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                            .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
                                    .addComponent(bNro0, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                                    .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
                                        .addComponent(bNro1)
                                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                        .addComponent(bNro2)))
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                                    .addComponent(bNro3)
                                    .addComponent(bVirgula, javax.swing.GroupLayout.PREFERRED_SIZE, 39, javax.swing.GroupLayout.PREFERRED_SIZE)))
                            .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
                                .addComponent(bNro4)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(bNro5)
                                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                                .addComponent(bNro6)))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addComponent(bIgual, javax.swing.GroupLayout.DEFAULT_SIZE, 41, Short.MAX_VALUE))
                    .addGroup(javax.swing.GroupLayout.Alignment.LEADING, layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                            .addComponent(bNro7)
                            .addComponent(bC, javax.swing.GroupLayout.DEFAULT_SIZE, 39, Short.MAX_VALUE))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(bDivisao, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addComponent(bNro8))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(bMultiplicacao, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addComponent(bNro9))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                            .addComponent(bSubtracao, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                            .addComponent(bSoma, javax.swing.GroupLayout.PREFERRED_SIZE, 41, javax.swing.GroupLayout.PREFERRED_SIZE))))
                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
                .addContainerGap()
                .addComponent(lDisplay, javax.swing.GroupLayout.DEFAULT_SIZE, 50, Short.MAX_VALUE)
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(bMultiplicacao, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(bSubtracao, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE))
                    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                        .addComponent(bDivisao, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
                        .addComponent(bC, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(bNro7, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(bNro8, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(bNro9, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(bSoma, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
                    .addGroup(layout.createSequentialGroup()
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(bNro4, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(bNro5, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(bNro6, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(bNro1, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(bNro2, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(bNro3, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE))
                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                        .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                            .addComponent(bNro0, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)
                            .addComponent(bVirgula, javax.swing.GroupLayout.PREFERRED_SIZE, 31, javax.swing.GroupLayout.PREFERRED_SIZE)))
                    .addComponent(bIgual, javax.swing.GroupLayout.PREFERRED_SIZE, 105, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addContainerGap())
        );

        pack();
    }// </editor-fold>                        

    private void bNro1ActionPerformed(java.awt.event.ActionEvent evt) {                                      
        Adds = "1";
        Digitos += Adds;
        lDisplay.setText(Digitos);        
    }                                     

    private void bNro3ActionPerformed(java.awt.event.ActionEvent evt) {                                      
        Adds = "3";
        Digitos += Adds;
        lDisplay.setText(Digitos);
    }                                     

    private void bNro2ActionPerformed(java.awt.event.ActionEvent evt) {                                      
        Adds = "2";
        Digitos += Adds;
        lDisplay.setText(Digitos);
    }                                     

    private void bSubtracaoActionPerformed(java.awt.event.ActionEvent evt) {                                           
        if(flag == true){
            Convertido1 = Double.parseDouble(Digitos);
            Digitos = "";
            Resultado = Convertido1 - Convertido2;
            ResultadoString = String.valueOf(Resultado);
            lDisplay.setText(ResultadoString);
            flag = false;
        }else{
            Convertido2 = Double.parseDouble(Digitos);
            Digitos = "";
            Resultado = Convertido1 - Convertido2;
            Convertido1 = 0;
            ResultadoString = String.valueOf(Resultado);
            lDisplay.setText(ResultadoString);
            Convertido2 = Resultado;
            flag = true;
        }
    }                                          

    private void bNro4ActionPerformed(java.awt.event.ActionEvent evt) {                                      
        Adds = "4";
        Digitos += Adds;
        lDisplay.setText(Digitos);
    }                                     

    private void bNro5ActionPerformed(java.awt.event.ActionEvent evt) {                                      
        Adds = "5";
        Digitos += Adds;
        lDisplay.setText(Digitos);
    }                                     

    private void bNro6ActionPerformed(java.awt.event.ActionEvent evt) {                                      
        Adds = "6";
        Digitos += Adds;
        lDisplay.setText(Digitos);
    }                                     

    private void bMultiplicacaoActionPerformed(java.awt.event.ActionEvent evt) {                                               
        if(flag == true){
            Convertido1 = Double.parseDouble(Digitos);
            Digitos = "";
            Resultado = Convertido1 * Convertido2;
            ResultadoString = String.valueOf(Resultado);
            //lDisplay.setText(ResultadoString);
            flag = false;
        }else{
            Convertido2 = Double.parseDouble(Digitos);
            Digitos = "";
            Resultado = Convertido1 * Convertido2;
            Convertido1 = 0;
            ResultadoString = String.valueOf(Resultado);
            lDisplay.setText(ResultadoString);
            Convertido2 = Resultado;
            flag = true;
        }
    }                                              

    private void bNro7ActionPerformed(java.awt.event.ActionEvent evt) {                                      
       Adds = "7";
        Digitos += Adds;
        lDisplay.setText(Digitos);
    }                                     

    private void bNro8ActionPerformed(java.awt.event.ActionEvent evt) {                                      
        Adds = "8";
        Digitos += Adds;
        lDisplay.setText(Digitos);
    }                                     

    private void bNro9ActionPerformed(java.awt.event.ActionEvent evt) {                                      
        Adds = "9";
        Digitos += Adds;
        lDisplay.setText(Digitos);
    }                                     

    private void bDivisaoActionPerformed(java.awt.event.ActionEvent evt) {                                         
        if(flag == true){
            Convertido1 = Double.parseDouble(Digitos);
            Digitos = "";
            Resultado = Convertido1 / Convertido2;
            ResultadoString = String.valueOf(Resultado);
            //lDisplay.setText(ResultadoString);
            flag = false;
        }else{
            Convertido2 = Double.parseDouble(Digitos);
            Digitos = "";
            Resultado = Convertido1 / Convertido2;
            Convertido1 = 0;
            ResultadoString = String.valueOf(Resultado);
            lDisplay.setText(ResultadoString);
            Convertido2 = Resultado;
            flag = true;
        }
    }                                        

    private void bVirgulaActionPerformed(java.awt.event.ActionEvent evt) {                                         
        Adds = ",";
        Digitos += Adds;
        lDisplay.setText(Digitos);
    }                                        

    private void bNro0ActionPerformed(java.awt.event.ActionEvent evt) {                                      
        Adds = "0";
        Digitos += Adds;
        lDisplay.setText(Digitos);
    }                                     

    private void bSomaActionPerformed(java.awt.event.ActionEvent evt) {                                      
        if(flag == true){
            Convertido1 = Double.parseDouble(Digitos);
            Digitos = "";
            Resultado = Convertido1 + Convertido2;
            ResultadoString = String.valueOf(Resultado);
            lDisplay.setText(ResultadoString);
            flag = false;
        }else{
            Convertido2 = Double.parseDouble(Digitos);
            Digitos = "";
            Resultado = Convertido1 + Convertido2;
            Convertido1 = 0;
            ResultadoString = String.valueOf(Resultado);
            lDisplay.setText(ResultadoString);
            Convertido2 = Resultado;
            flag = true;
        }

    }                                     

    private void bIgualActionPerformed(java.awt.event.ActionEvent evt) {                                       
        // TODO add your handling code here:
    }                                      

    private void bCActionPerformed(java.awt.event.ActionEvent evt) {                                   
        lDisplay.setText("");
        Adds = "";
        Digitos ="";
        flag = true;
        Convertido1 = 0;
        Convertido2 = 0;
    }                                  

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new InterfaceCalc().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton bC;
    private javax.swing.JButton bDivisao;
    private javax.swing.JButton bIgual;
    private javax.swing.JButton bMultiplicacao;
    private javax.swing.JButton bNro0;
    private javax.swing.JButton bNro1;
    private javax.swing.JButton bNro2;
    private javax.swing.JButton bNro3;
    private javax.swing.JButton bNro4;
    private javax.swing.JButton bNro5;
    private javax.swing.JButton bNro6;
    private javax.swing.JButton bNro7;
    private javax.swing.JButton bNro8;
    private javax.swing.JButton bNro9;
    private javax.swing.JButton bSoma;
    private javax.swing.JButton bSubtracao;
    private javax.swing.JButton bVirgula;
    private javax.swing.JToggleButton jToggleButton1;
    private javax.swing.JLabel lDisplay;
    // End of variables declaration                   

}
Alura Desenvolvimento Back-End Java Sua Carreira em desenvolvimento back-end Java: dos fundamentos à arquitetura de sistemas...

2 Respostas

L
lokits5

entaum brother tenhu uma que é feito em java mas é feito no eclipse

dá uma olhada pode servir algo falou!!!!

:arrow: :arrow:

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Calculadora extends JFrame implements ActionListener {

    	private static final long serialVersionUID = 1L;
	private JButton somar, subtrair, multiplicar, dividir, limpar, voltar, igual, ponto;
    private JButton bt0, bt1, bt2, bt3, bt4, bt5, bt6, bt7, bt8, bt9;
    private JTextField tfVisor;
    private double n1, n2;
    private char operacao = ' ';
    private boolean segundo = true;
    private boolean utd = false;

    public Calculadora() {
        //Ajuste do formulário
        setTitle("Calculadora");
        setSize(245, 260);
        setLocation(WIDTH, WIDTH);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setResizable(false);
        getContentPane().setLayout(null);

        //Inicialização dos botões
        somar = new JButton("+");
        subtrair = new JButton("-");
        multiplicar = new JButton("*");
        dividir = new JButton("/");
        limpar = new JButton("CE");
        voltar = new JButton("Backspace");
        igual = new JButton("=");
        ponto = new JButton(",");
        bt0 = new JButton("0");
        bt1 = new JButton("1");
        bt2 = new JButton("2");
        bt3 = new JButton("3");
        bt4 = new JButton("4");
        bt5 = new JButton("5");
        bt6 = new JButton("6");
        bt7 = new JButton("7");
        bt8 = new JButton("8");
        bt9 = new JButton("9");
        tfVisor = new JTextField();

        //Posicionar componentes no formulário
        tfVisor.setBounds(10, 10, 220, 40);

        voltar.setBounds(10, 55, 160, 30);
        limpar.setBounds(180, 55, 50, 30);

        bt7.setBounds(10, 90, 50, 30);
        bt8.setBounds(65, 90, 50, 30);
        bt9.setBounds(120, 90, 50, 30);
        dividir.setBounds(180, 90, 50, 30);

        bt4.setBounds(10, 125, 50, 30);
        bt5.setBounds(65, 125, 50, 30);
        bt6.setBounds(120, 125, 50, 30);
        multiplicar.setBounds(180, 125, 50, 30);

        bt1.setBounds(10, 160, 50, 30);
        bt2.setBounds(65, 160, 50, 30);
        bt3.setBounds(120, 160, 50, 30);
        subtrair.setBounds(180, 160, 50, 30);

        bt0.setBounds(10, 195, 50, 30);
        ponto.setBounds(65, 195, 50, 30);
        igual.setBounds(120, 195, 50, 30);
        somar.setBounds(180, 195, 50, 30);

        //Cores dos componentes
        bt0.setForeground(Color.BLUE);
        bt1.setForeground(Color.BLUE);
        bt2.setForeground(Color.BLUE);
        bt3.setForeground(Color.BLUE);
        bt4.setForeground(Color.BLUE);
        bt5.setForeground(Color.BLUE);
        bt6.setForeground(Color.BLUE);
        bt7.setForeground(Color.BLUE);
        bt8.setForeground(Color.BLUE);
        bt9.setForeground(Color.BLUE);
        ponto.setForeground(Color.BLUE);

        somar.setForeground(Color.red);
        subtrair.setForeground(Color.red);
        multiplicar.setForeground(Color.red);
        dividir.setForeground(Color.red);
        igual.setForeground(Color.red);
        limpar.setForeground(Color.red);
        voltar.setForeground(Color.red);

        tfVisor.setHorizontalAlignment(JTextField.RIGHT);

        //Registro de componentes que executam ações

        bt0.addActionListener(this);
        bt1.addActionListener(this);
        bt2.addActionListener(this);
        bt3.addActionListener(this);
        bt4.addActionListener(this);
        bt5.addActionListener(this);
        bt6.addActionListener(this);
        bt7.addActionListener(this);
        bt8.addActionListener(this);
        bt9.addActionListener(this);
        somar.addActionListener(this);
        subtrair.addActionListener(this);
        multiplicar.addActionListener(this);
        dividir.addActionListener(this);
        igual.addActionListener(this);
        limpar.addActionListener(this);
        voltar.addActionListener(this);
        ponto.addActionListener(this);

        //Colocar os componentes no formulário
        this.getContentPane().add(somar);
        this.getContentPane().add(subtrair);
        this.getContentPane().add(multiplicar);
        this.getContentPane().add(dividir);
        this.getContentPane().add(tfVisor);
        this.getContentPane().add(bt0);
        this.getContentPane().add(bt1);
        this.getContentPane().add(bt2);
        this.getContentPane().add(bt3);
        this.getContentPane().add(bt4);
        this.getContentPane().add(bt5);
        this.getContentPane().add(bt6);
        this.getContentPane().add(bt7);
        this.getContentPane().add(bt8);
        this.getContentPane().add(bt9);
        this.getContentPane().add(igual);
        this.getContentPane().add(limpar);
        this.getContentPane().add(voltar);
        this.getContentPane().add(dividir);
        this.getContentPane().add(ponto);
    }

    public static void main(String args[]) {
        JFrame obj = new Calculadora();
        obj.setVisible(true);
    }

    public void actionPerformed(ActionEvent acao) {
        if (acao.getSource() == bt0) {
            if (tfVisor.getText().equals("")) {
                return;
            } else {
                numDigi("0");
            }
        } else if (acao.getSource() == bt1) {
            numDigi("1");
        } else if (acao.getSource() == bt2) {
            numDigi("2");
        } else if (acao.getSource() == bt3) {
            numDigi("3");
        } else if (acao.getSource() == bt4) {
            numDigi("4");
        } else if (acao.getSource() == bt5) {
            numDigi("5");
        } else if (acao.getSource() == bt6) {
            numDigi("6");
        } else if (acao.getSource() == bt7) {
            numDigi("7");
        } else if (acao.getSource() == bt8) {
            numDigi("8");
        } else if (acao.getSource() == bt9) {
            numDigi("9");
        } else if (acao.getSource() == ponto) {
            decimal();
        }
        if (acao.getSource() == limpar) {
            tfVisor.setText("");
            operacao = ' ';
            segundo = true;
            utd = false;
            n1 = 0;
            n2 = 0;
        }
        if (acao.getSource() == voltar) {
            int tam = tfVisor.getText().length();
            if (tam > 0) {
                tfVisor.setText(tfVisor.getText().substring(0, tam - 1));
            } else {
                return;
            }
        }
        if (acao.getSource() == somar) {
            igual();
            calcular('+');
        }
        if (acao.getSource() == subtrair) {
            igual();
            calcular('-');
        }
        if (acao.getSource() == multiplicar) {
            igual();
            calcular('*');
        }
        if (acao.getSource() == dividir) {
            igual();
            calcular('/');
        }
        if (acao.getSource() == igual) {
            igual();
        }
    }

    private void calcular(char c) {
        if (!tfVisor.getText().equals("")) {
            operacao = c;
            segundo = false;
            utd = false;
            n1 = Double.parseDouble(tfVisor.getText());
        } else {
            return;
        }
    }

    private void numDigi(String n) {
        if (segundo == true) {
            tfVisor.setText(tfVisor.getText() + n);
        } else {
            tfVisor.setText("");
            tfVisor.setText(tfVisor.getText() + n);
            segundo = true;
        }
    }

    private void igual() {
        if (operacao == '+') {
            n2 = n1 + Double.parseDouble(tfVisor.getText());
            tfVisor.setText("" + n2);
            n1 = 0;
            n2 = 0;
            operacao = ' ';
            segundo = false;
        } else if (operacao == '-') {
            n2 = n1 - Double.parseDouble(tfVisor.getText());
            tfVisor.setText("" + n2);
            n1 = 0;
            n2 = 0;
            operacao = ' ';
        } else if (operacao == '*') {
            n2 = n1 * Double.parseDouble(tfVisor.getText());
            tfVisor.setText("" + n2);
            n1 = 0;
            n2 = 0;
            operacao = ' ';
        } else if (operacao == '/') {
            n2 = n1 / Double.parseDouble(tfVisor.getText());
            tfVisor.setText("" + n2);
            n1 = 0;
            n2 = 0;
            operacao = ' ';
        } else {
            return;
        }
    }

    private void decimal() {
        if (utd == false) {
            if (tfVisor.getText().length() < 1) {
                numDigi("0.");
            }
            else if (possuePonto() == true){
                    return;
                }
                else{
                numDigi(".");
                }
            }
            utd = true;
        
    }

    private boolean possuePonto(){
        String v = tfVisor.getText();
        boolean b = false;
        for (int i = 0; i<v.length();i++){
            if (v.substring(i, i).equals(".")){
                b = true;
            }
            else {
                b = false;
            }
        }
        return b;
    }
}
Marchiore
Marchiore

Opa cara, valeu…
Desculpa demorar para responder…=D
me ajudou sim…esse teu código…valeu…
abraço

Criado 1 de junho de 2010
Ultima resposta 5 de jun. de 2010
Respostas 2
Participantes 2

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