Реферат на тему:
«Проект калькулятор в Java»
Давыдов Иван 11ТО
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MyCalc extends JFrame {
private JButton display;
private double result;
private String lastCom;
private boolean start;
private void addButton(String name, ActionListener listener, int x, int y,
int width, int height) {
JButton button = new JButton(name);
button.setBounds(x, y, width, height);
button.addActionListener(listener);
getContentPane().add(button);
}
public MyCalc() {
getContentPane().setLayout(null);
setTitle("Мой калькулятор");
setBounds(200, 200, 203, 242);
getContentPane().setBackground(new Color(100, 149, 237));
ActionListener output = new OutputAction();
ActionListener command = new CommandAction();
result = 0;
lastCom = "=";
start = true;
display = new JButton("0");
display.setEnabled(false);
display.setBounds(5, 10, 177, 30);
addButton("7", output, 5, 50, 41, 20);
addButton("8", output, 50, 50, 41, 20);
addButton("9", output, 95, 50, 41, 20);
addButton("/", command, 140, 50, 41, 20);
addButton("4", output, 5, 75, 41, 20);
addButton("5", output, 50, 75, 41, 20);
addButton("6", output, 95, 75, 41, 20);
addButton("*", command, 140, 75, 41, 20);
addButton("1", output, 5, 100, 41, 20);
addButton("2", output, 50, 100, 41, 20);
addButton("3", output, 95, 100, 41, 20);
addButton("-", command, 140, 100, 41, 20);
addButton("0", output, 5, 125, 41, 20);
addButton(".", output, 50, 125, 41, 20);
addButton("=", command, 95, 125, 41, 20);
addButton("+", command, 140, 125, 41, 20);
addButton("с", command, 5, 150, 85, 20);
addButton("<", command, 95, 150, 85, 20);
addButton("sqrt", command, 5, 175, 85, 20);
addButton("pow(x,2)", command, 95, 175, 85, 20);
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
TextEvent t = new TextEvent(getContentPane(), 1);
}
private class OutputAction 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 {
lastCom = command;
}
}else if (command.equals("sqrt")) {
display.setText("" + Math.sqrt(Double.parseDouble(display.getText())));
start = true;
} else if (command.equals("pow(x,2)")) {
display.setText("" + Math.pow(Double.parseDouble(display.getText()), 2));
start = true;
}else if (command.equals("с")) {
display.setText("");
start = true;
}else if (command.equals("<")) {
//???
} else {
calculate(Double.parseDouble(display.getText()));
lastCom = command;
start = true;
}
}
}
public void calculate(double x) {
if (lastCom.equals("+")) {
result += x;
display.setText("" + result);
} else if (lastCom.equals("-")) {
result -= x;
display.setText("" + result);
} else if (lastCom.equals("*")) {
result *= x;
display.setText("" + result);
} else if (lastCom.equals("/")) {
if (x == 0) {
display.setText("Деление на ноль");
} else {
result /= x;
display.setText("" + result);
}
} else if (lastCom.equals("=")) {
result = x;
display.setText("" + result);
}
}
public static void main(String[] args) {
new MyCalc();
}
}
Результат:
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