Представляю вам готовый калькулятор на Java. Просто скопируйте нижний код и вставьте его в ваш IDE Eclipse или NetBeans.
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import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Calculator { public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { public void run() { CalculatorFrame frame = new CalculatorFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setVisible(true); } }); } } class CalculatorFrame extends JFrame { public CalculatorFrame() { setTitle("Calculator"); CalculatorPanel panel = new CalculatorPanel(); add(panel); pack(); } } class CalculatorPanel extends JPanel { public CalculatorPanel() { setLayout(new BorderLayout()); result = 0; lastCommand = "="; start=true; display = new JButton("0"); display.setEnabled(false); add(display, BorderLayout.NORTH); ActionListener insert = new InsertAction(); ActionListener command = new CommandAction(); panel = new JPanel(); panel.setLayout(new GridLayout(4, 4)); addButton("7", insert); addButton("8", insert); addButton("9", insert); addButton("/", command); addButton("4", insert); addButton("5", insert); addButton("6", insert); addButton("*", command); addButton("1", insert); addButton("2", insert); addButton("3", insert); addButton("-", command); addButton("0", insert); addButton(".", insert); addButton("=", command); addButton("+", command); add(panel, BorderLayout.CENTER); } private void addButton(String label, ActionListener listener) { JButton button = new JButton(label); button.addActionListener(listener); panel.add(button); } private class InsertAction implements ActionListener { public void actionPerformed(ActionEvent event) { String input = event.getActionCommand(); if(start) { display.setText(""); start = false; } display.setText(display.getText() + input); } } private class CommandAction implements ActionListener { public void actionPerformed(ActionEvent event) { String command = event.getActionCommand(); if(start) { if(command.equals("-")) { display.setText(command); start = false; } else lastCommand = command; } else { calculate(Double.parseDouble(display.getText())); lastCommand = command; start=true; } } } public void calculate(double x) { if(lastCommand.equals("+")) result += x; else if(lastCommand.equals("-")) result -= x; else if(lastCommand.equals("*")) result *= x; else if(lastCommand.equals("/")) result /= x; else if(lastCommand.equals("=")) result = x; display.setText("" + result); } private JButton display; private JPanel panel; private double result; private String lastCommand; private boolean start; } |