Java计算器源码
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import java.awt.BorderLayout;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JPanel;
public class Calculator extends JPanel
{
/**
*
*/
private static final long serialVersionUID = 1L;
private JButton display;
private JPanel panel;
private double result;
private String lastCommand;
private boolean start;
public Calculator()
{
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);
}
public class InsertAction implements ActionListener
{
@Override
public void actionPerformed(ActionEvent e)
{
String input = e.getActionCommand();
if (start)
{
display.setText("");
start = false;
}
display.setText(display.getText() + input);
}
}
public class CommandAction implements ActionListener
{
@Override
public void actionPerformed(ActionEvent e)
{
String command = e.getActionCommand();
if (start)
{
if (command.equals("-"))
{
display.setText(command);
start = false;
}
else
{
lastCommand = command;
start = true;
}
}
else
{
caculate(Double.parseDouble(display.getText()));
lastCommand = command;
start = true;
}
}
}
public void caculate(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);
}
}
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JPanel;
public class Calculator extends JPanel
{
/**
*
*/
private static final long serialVersionUID = 1L;
private JButton display;
private JPanel panel;
private double result;
private String lastCommand;
private boolean start;
public Calculator()
{
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);
}
public class InsertAction implements ActionListener
{
@Override
public void actionPerformed(ActionEvent e)
{
String input = e.getActionCommand();
if (start)
{
display.setText("");
start = false;
}
display.setText(display.getText() + input);
}
}
public class CommandAction implements ActionListener
{
@Override
public void actionPerformed(ActionEvent e)
{
String command = e.getActionCommand();
if (start)
{
if (command.equals("-"))
{
display.setText(command);
start = false;
}
else
{
lastCommand = command;
start = true;
}
}
else
{
caculate(Double.parseDouble(display.getText()));
lastCommand = command;
start = true;
}
}
}
public void caculate(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);
}
}
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