Este é o projeto de uma calculadora feita em Java no IDE Netbeans.

Gostaria que dessem uma olhada e identificassem possíveis erros ou dessem alguma dica para melhorar o meu projeto.

Desde já agradeço a todos.

• Download Calculadora.jar
• Enviar nova versão

Esconder código-fonte

public class calculadora extends javax.swing.JFrame {
String tela,op;
double res,por,raiz,m,v1,v2;

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

        jPanel1 = new javax.swing.JPanel();
        tfExibe = new javax.swing.JTextField();
        b9 = new javax.swing.JButton();
        bOff = new javax.swing.JButton();
        bCe = new javax.swing.JButton();
        bSqrt = new javax.swing.JButton();
        bDiv = new javax.swing.JButton();
        bMult = new javax.swing.JButton();
        bSub = new javax.swing.JButton();
        bAdi = new javax.swing.JButton();
        bIgual = new javax.swing.JButton();
        b0 = new javax.swing.JButton();
        bPor = new javax.swing.JButton();
        bOn = new javax.swing.JButton();
        bMr = new javax.swing.JButton();
        bMais = new javax.swing.JButton();
        bMenos = new javax.swing.JButton();
        b1 = new javax.swing.JButton();
        b2 = new javax.swing.JButton();
        b3 = new javax.swing.JButton();
        b6 = new javax.swing.JButton();
        b5 = new javax.swing.JButton();
        b4 = new javax.swing.JButton();
        b7 = new javax.swing.JButton();
        b8 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Calculadora");
        setResizable(false);

        jPanel1.setLayout(null);
        jPanel1.add(tfExibe);
        tfExibe.setBounds(10, 10, 320, 23);

        b9.setText("9");
        b9.setEnabled(false);
        b9.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                b9ActionPerformed(evt);
            }
        });
        jPanel1.add(b9);
        b9.setBounds(220, 80, 50, 27);

        bOff.setMnemonic('f');
        bOff.setText("OFF");
        bOff.setEnabled(false);
        bOff.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bOffActionPerformed(evt);
            }
        });
        jPanel1.add(bOff);
        bOff.setBounds(90, 50, 70, 27);

        bCe.setMnemonic('c');
        bCe.setText("CE");
        bCe.setEnabled(false);
        bCe.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bCeActionPerformed(evt);
            }
        });
        jPanel1.add(bCe);
        bCe.setBounds(160, 50, 60, 27);

        bSqrt.setMnemonic('s');
        bSqrt.setText("SQRT");
        bSqrt.setEnabled(false);
        bSqrt.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bSqrtActionPerformed(evt);
            }
        });
        jPanel1.add(bSqrt);
        bSqrt.setBounds(20, 200, 120, 30);

        bDiv.setText("/");
        bDiv.setEnabled(false);
        bDiv.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bDivActionPerformed(evt);
            }
        });
        jPanel1.add(bDiv);
        bDiv.setBounds(220, 50, 50, 27);

        bMult.setText("X");
        bMult.setEnabled(false);
        bMult.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bMultActionPerformed(evt);
            }
        });
        jPanel1.add(bMult);
        bMult.setBounds(280, 50, 50, 27);

        bSub.setText("-");
        bSub.setEnabled(false);
        bSub.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bSubActionPerformed(evt);
            }
        });
        jPanel1.add(bSub);
        bSub.setBounds(280, 80, 50, 27);

        bAdi.setText("+");
        bAdi.setEnabled(false);
        bAdi.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bAdiActionPerformed(evt);
            }
        });
        jPanel1.add(bAdi);
        bAdi.setBounds(280, 110, 50, 80);

        bIgual.setText("=");
        bIgual.setEnabled(false);
        bIgual.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bIgualActionPerformed(evt);
            }
        });
        jPanel1.add(bIgual);
        bIgual.setBounds(280, 200, 50, 30);

        b0.setText("0");
        b0.setEnabled(false);
        b0.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                b0ActionPerformed(evt);
            }
        });
        jPanel1.add(b0);
        b0.setBounds(210, 200, 50, 30);

        bPor.setText("%");
        bPor.setEnabled(false);
        bPor.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bPorActionPerformed(evt);
            }
        });
        jPanel1.add(bPor);
        bPor.setBounds(150, 200, 50, 30);

        bOn.setMnemonic('o');
        bOn.setText("ON");
        bOn.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bOnActionPerformed(evt);
            }
        });
        jPanel1.add(bOn);
        bOn.setBounds(20, 50, 70, 27);

        bMr.setMnemonic('m');
        bMr.setText("MR");
        bMr.setEnabled(false);
        bMr.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bMrActionPerformed(evt);
            }
        });
        jPanel1.add(bMr);
        bMr.setBounds(20, 80, 70, 27);

        bMais.setText("M+");
        bMais.setEnabled(false);
        bMais.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bMaisActionPerformed(evt);
            }
        });
        jPanel1.add(bMais);
        bMais.setBounds(20, 120, 70, 27);

        bMenos.setText("M-");
        bMenos.setEnabled(false);
        bMenos.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                bMenosActionPerformed(evt);
            }
        });
        jPanel1.add(bMenos);
        bMenos.setBounds(20, 160, 70, 27);

        b1.setText("1");
        b1.setEnabled(false);
        b1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                b1ActionPerformed(evt);
            }
        });
        jPanel1.add(b1);
        b1.setBounds(100, 160, 50, 27);

        b2.setText("2");
        b2.setEnabled(false);
        b2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                b2ActionPerformed(evt);
            }
        });
        jPanel1.add(b2);
        b2.setBounds(160, 160, 50, 27);

        b3.setText("3");
        b3.setEnabled(false);
        b3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                b3ActionPerformed(evt);
            }
        });
        jPanel1.add(b3);
        b3.setBounds(220, 160, 50, 27);

        b6.setText("6");
        b6.setEnabled(false);
        b6.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                b6ActionPerformed(evt);
            }
        });
        jPanel1.add(b6);
        b6.setBounds(220, 120, 50, 27);

        b5.setText("5");
        b5.setEnabled(false);
        b5.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                b5ActionPerformed(evt);
            }
        });
        jPanel1.add(b5);
        b5.setBounds(160, 120, 50, 27);

        b4.setText("4");
        b4.setEnabled(false);
        b4.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                b4ActionPerformed(evt);
            }
        });
        jPanel1.add(b4);
        b4.setBounds(100, 120, 50, 27);

        b7.setText("7");
        b7.setEnabled(false);
        b7.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                b7ActionPerformed(evt);
            }
        });
        jPanel1.add(b7);
        b7.setBounds(100, 80, 50, 27);

        b8.setText("8");
        b8.setEnabled(false);
        b8.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                b8ActionPerformed(evt);
            }
        });
        jPanel1.add(b8);
        b8.setBounds(160, 80, 50, 27);

        getContentPane().add(jPanel1, java.awt.BorderLayout.CENTER);

        java.awt.Dimension screenSize = java.awt.Toolkit.getDefaultToolkit().getScreenSize();
        setBounds((screenSize.width-364)/2, (screenSize.height-276)/2, 364, 276);
    }// </editor-fold>

private void b0ActionPerformed(java.awt.event.ActionEvent evt) {
if(tela==""){      
    tfExibe.setText(tfExibe.getText()+"0");
}else{        
    tfExibe.setText(tfExibe.getText()+"0");
}
tela="0";
}

private void b1ActionPerformed(java.awt.event.ActionEvent evt) {
if(tela==""){   
    tfExibe.setText(tfExibe.getText()+"1");
}else{    
    tfExibe.setText(tfExibe.getText()+"1");
}
tela="1";
}

private void b2ActionPerformed(java.awt.event.ActionEvent evt) {
if(tela==""){   
    tfExibe.setText(tfExibe.getText()+"2");
}else{    
    tfExibe.setText(tfExibe.getText()+"2");
}
tela="2";
}

private void b3ActionPerformed(java.awt.event.ActionEvent evt) {
if(tela==""){   
    tfExibe.setText(tfExibe.getText()+"3");
}else{    
    tfExibe.setText(tfExibe.getText()+"3");
}
tela="3";
}

private void b4ActionPerformed(java.awt.event.ActionEvent evt) {
if(tela==""){   
    tfExibe.setText(tfExibe.getText()+"4");
}else{    
    tfExibe.setText(tfExibe.getText()+"4");
}
tela="4";
}

private void b5ActionPerformed(java.awt.event.ActionEvent evt) {
if(tela==""){   
    tfExibe.setText(tfExibe.getText()+"5");
}else{    
    tfExibe.setText(tfExibe.getText()+"5");
}
tela="5";
}

private void b6ActionPerformed(java.awt.event.ActionEvent evt) {
if(tela==""){   
    tfExibe.setText(tfExibe.getText()+"6");
}else{    
tfExibe.setText(tfExibe.getText()+"6");
}
tela="6";
}

private void b7ActionPerformed(java.awt.event.ActionEvent evt) {
if(tela==""){   
    tfExibe.setText(tfExibe.getText()+"7");
}else{
    tfExibe.setText(tfExibe.getText()+"7");
}
tela="7";
}

private void b8ActionPerformed(java.awt.event.ActionEvent evt) {
if(tela==""){   
    tfExibe.setText(tfExibe.getText()+"8");
}else{
    tfExibe.setText(tfExibe.getText()+"8");
}
tela="8";
}

private void b9ActionPerformed(java.awt.event.ActionEvent evt) {
if(tela==""){   
    tfExibe.setText(tfExibe.getText()+"9");
}else{
    tfExibe.setText(tfExibe.getText()+"9");
}
tela="9";
}

private void bAdiActionPerformed(java.awt.event.ActionEvent evt) {
if (op=="+"){
    v2=Double.parseDouble(tfExibe.getText());
    v1=v1+v2; 
}
        op="+";
v1=Double.parseDouble(tfExibe.getText());
tela="";
tfExibe.setText("");
}

private void bSubActionPerformed(java.awt.event.ActionEvent evt) {
  if (op=="-"){
    v2=Double.parseDouble(tfExibe.getText());
    v1=v1-v2;
}
        op="-";
v1=Double.parseDouble(tfExibe.getText());
tela="";
tfExibe.setText("");
}

private void bMultActionPerformed(java.awt.event.ActionEvent evt) {
  if (op=="*"){
    v2=Double.parseDouble(tfExibe.getText());
    v1=v1*v2;
}
        op="*";
v1=Double.parseDouble(tfExibe.getText());
tela="";
tfExibe.setText("");
}

private void bDivActionPerformed(java.awt.event.ActionEvent evt) {
  if (op=="/"){
    v2=Double.parseDouble(tfExibe.getText());
    v1=v1/v2;
    
}
        op="/";
v1=Double.parseDouble(tfExibe.getText());
tela="";
tfExibe.setText("");
}

private void bIgualActionPerformed(java.awt.event.ActionEvent evt) {
v2=Double.parseDouble(tfExibe.getText());
if (op=="+"){
    res=v1+v2;
}
if (op=="-"){
    res=v1-v2;
}
if (op=="/"){
    res=v1/v2;
}
if (op=="*"){
    res=v1*v2;
}
tfExibe.setText(String.valueOf(res));
tela="";
op="";
res=0;
v1=0;
v2=0;
raiz=0;
por=0;
}

private void bCeActionPerformed(java.awt.event.ActionEvent evt) {
tfExibe.setText("");
tela=null;
op=null;
res=0;
por=0;
v1=0;
v2=0;
}

private void bPorActionPerformed(java.awt.event.ActionEvent evt) {
v2=Double.parseDouble(tfExibe.getText());
if (op=="+"){
    por=v1+((v1*v2)/100);
  }
if (op=="-"){
    por=v1-((v1*v2)/100);
  }
if (op=="*"){
    por=(v1*v2)/100;
  }
tfExibe.setText(String.valueOf(por));
tela="";
}

private void bSqrtActionPerformed(java.awt.event.ActionEvent evt) {
raiz=Double.parseDouble(tfExibe.getText());
tfExibe.setText(String.valueOf(Math.sqrt(raiz)));

}

private void bMrActionPerformed(java.awt.event.ActionEvent evt) {
tfExibe.setText(String.valueOf(m));
}

private void bMaisActionPerformed(java.awt.event.ActionEvent evt) {
m=Double.parseDouble(tfExibe.getText());
}

private void bMenosActionPerformed(java.awt.event.ActionEvent evt) {
m=0;
}

private void bOnActionPerformed(java.awt.event.ActionEvent evt) {
b1.setEnabled(true);
b2.setEnabled(true);
b3.setEnabled(true);
b4.setEnabled(true);
b5.setEnabled(true);
b6.setEnabled(true);
b7.setEnabled(true);
b8.setEnabled(true);
b9.setEnabled(true);
b0.setEnabled(true);
bOff.setEnabled(true);
bAdi.setEnabled(true);
bDiv.setEnabled(true);
bMult.setEnabled(true);
bSub.setEnabled(true);
bPor.setEnabled(true);
bSqrt.setEnabled(true);
bCe.setEnabled(true);
bIgual.setEnabled(true);
bMr.setEnabled(true);
bMais.setEnabled(true);
bMenos.setEnabled(true);
bOn.setEnabled(false);
tfExibe.requestFocus();
}

private void bOffActionPerformed(java.awt.event.ActionEvent evt) {
b1.setEnabled(false);
b2.setEnabled(false);
b3.setEnabled(false);
b4.setEnabled(false);
b5.setEnabled(false);
b6.setEnabled(false);
b7.setEnabled(false);
b8.setEnabled(false);
b9.setEnabled(false);
b0.setEnabled(false);
bOff.setEnabled(false);
bAdi.setEnabled(false);
bDiv.setEnabled(false);
bMult.setEnabled(false);
bSub.setEnabled(false);
bPor.setEnabled(false);
bSqrt.setEnabled(false);
bCe.setEnabled(false);
bIgual.setEnabled(false);
bMr.setEnabled(false);
bMais.setEnabled(false);
bMenos.setEnabled(false);
bOn.setEnabled(true);
tfExibe.setText("");
tela=null;
op=null;
res=0;
por=0;
v1=0;
v2=0;
}
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new calculadora().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify
    private javax.swing.JButton b0;
    private javax.swing.JButton b1;
    private javax.swing.JButton b2;
    private javax.swing.JButton b3;
    private javax.swing.JButton b4;
    private javax.swing.JButton b5;
    private javax.swing.JButton b6;
    private javax.swing.JButton b7;
    private javax.swing.JButton b8;
    private javax.swing.JButton b9;
    private javax.swing.JButton bAdi;
    private javax.swing.JButton bCe;
    private javax.swing.JButton bDiv;
    private javax.swing.JButton bIgual;
    private javax.swing.JButton bMais;
    private javax.swing.JButton bMenos;
    private javax.swing.JButton bMr;
    private javax.swing.JButton bMult;
    private javax.swing.JButton bOff;
    private javax.swing.JButton bOn;
    private javax.swing.JButton bPor;
    private javax.swing.JButton bSqrt;
    private javax.swing.JButton bSub;
    private javax.swing.JPanel jPanel1;
    private javax.swing.JTextField tfExibe;
    // End of variables declaration
}

Gerando números randômicos

Exemplo básico da biblioteca Swing

Retorno de nomes (com gráficos)

Soma Gratificação Menos o IR.

achar a raiz da equação do 2º

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