Crear cuenta
public class Launcher {public static void main(String[] args) {
Modelo modelo = new Modelo();
Vista vista = new Vista(modelo);
}}public class Modelo {private float operando1;
private char operador;
public void addOperando1(float operando1) {
this.operando1 = operando1;
}public void addOperandor(char operador) {
this.operador = operador;
}public float operacion(float operando2) {
switch (operador) {
case '+':
return operando1 + operando2;case '-':
return operando1 - operando2;case '*':
return operando1 * operando2; default: return operando1 / operando2; } }}import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
import javax.swing.WindowConstants;
public class Vista extends JFrame implements ActionListener {private JLabel lblDisplay;
private final Modelo modelo;
public Vista(Modelo modelo) {
this.modelo = modelo;
initComponents();
}private void initComponents() {
//Establece condiciones básicas
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
getContentPane().setLayout(null);
pack();
//Establece el lookAndFeel
try {for (UIManager.LookAndFeelInfo info : UIManager.getInstalledLookAndFeels()) {
if ("Windows".equals(info.getName())) {
UIManager.setLookAndFeel(info.getClassName());
break;
} }} catch (Exception ex) {
System.out.println("No se puede implementar LookAndFeel");
} //Agrega label para mostrar resultados
lblDisplay = new JLabel();
lblDisplay.setBackground(new Color(255, 255, 255));
lblDisplay.setFont(new Font("Tahoma", 0, 17)); // NOI18N
lblDisplay.setHorizontalAlignment(SwingConstants.RIGHT);
lblDisplay.setBorder(BorderFactory.createLineBorder(new Color(0, 0, 0)));
lblDisplay.setOpaque(true);
getContentPane().add(lblDisplay);
lblDisplay.setBounds(30, 30, 270, 40);
//Agrega el panel de los botones
JPanel pnlBotones = new JPanel();
pnlBotones.setLayout(new GridLayout(4, 4, 3, 3));
getContentPane().add(pnlBotones);
pnlBotones.setBounds(30, 90, 270, 200);
//Coloca los botones
JButton[] botones = new JButton[16];
String[] textoBotones = {"7","8","9","/",
"4","5","6","*",
"1","2","3","-",
"=","0",".","+"};
for (int i=0; i<botones.length; i++) {
botones[i] = new JButton();
botones[i].setText(textoBotones[i]);
botones[i].setFont(new Font("Tahoma", 0, 17));
botones[i].addActionListener(this);
pnlBotones.add(botones[i]);
} //Hace otras operaciones
this.setBounds(200, 200, 345, 350);
lblDisplay.setText("0");
this.setVisible(true);
}@Override
public void actionPerformed(ActionEvent e) {
JButton boton = (JButton)(e.getSource());
DecimalFormat format = new DecimalFormat("#.######");
format.setDecimalSeparatorAlwaysShown(false);
if("+-*/".contains(boton.getText())){
float numero1 = Float.parseFloat(lblDisplay.getText());
modelo.addOperando1(numero1);
char operador = boton.getText().charAt(0);
modelo.addOperandor(operador);
lblDisplay.setText("0");
} else if("=".contains(boton.getText())){
float numero2 = Float.parseFloat(lblDisplay.getText());
float resultado = modelo.operacion(numero2);
lblDisplay.setText("" + format.format(resultado));
} else if("0123456789".contains(boton.getText())){
String numero = lblDisplay.getText();
if(numero.equals("0")){
numero = "";
}numero = numero + boton.getText();
lblDisplay.setText(numero);
} else if(".".contains(boton.getText())){
String numero = lblDisplay.getText();
if(!numero.contains(".")){
numero = numero + boton.getText();
lblDisplay.setText(numero);
} else {
lblDisplay.setText("0");
} } }}
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