SimpleJavaSwingCalculator
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package corejavaI.layout;
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.JFrame;
import javax.swing.JPanel;
public class CalculatorTest {
public static void main(String[] args) {
JFrame frame = new JFrame();
JPanel panel = new CalculatorPanel();
frame.add(panel);
frame.setTitle("SimpleJavaSwingCalculator");
frame.setSize(300, 300);
frame.setLocation(200, 100);
frame.setVisible(true);
}
}
class CalculatorPanel extends JPanel{
private JButton display;
private JPanel panel;
private double result;
private String lastCommand;
private boolean start;
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();
ActionListener resetCommand = new ResetAction();
panel = new JPanel();
panel.setLayout(new GridLayout(5, 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);
addButton("重置", resetCommand);
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 e) {
String input = e.getActionCommand();
if(start){
display.setText("");
start = false;
}
display.setText(display.getText() + input);
}
}
private class CommandAction implements ActionListener{
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
if(start){
if(command.equals("-")){
display.setText(command);
start = false;
}else{
lastCommand = command;
}
}else{
calculate(Double.parseDouble(display.getText()));
lastCommand = command;
start = true;
}
}
}
private class ResetAction implements ActionListener{
public void actionPerformed(ActionEvent e) {
display.setText("0");
}
}
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);
}
}
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.JFrame;
import javax.swing.JPanel;
public class CalculatorTest {
public static void main(String[] args) {
JFrame frame = new JFrame();
JPanel panel = new CalculatorPanel();
frame.add(panel);
frame.setTitle("SimpleJavaSwingCalculator");
frame.setSize(300, 300);
frame.setLocation(200, 100);
frame.setVisible(true);
}
}
class CalculatorPanel extends JPanel{
private JButton display;
private JPanel panel;
private double result;
private String lastCommand;
private boolean start;
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();
ActionListener resetCommand = new ResetAction();
panel = new JPanel();
panel.setLayout(new GridLayout(5, 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);
addButton("重置", resetCommand);
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 e) {
String input = e.getActionCommand();
if(start){
display.setText("");
start = false;
}
display.setText(display.getText() + input);
}
}
private class CommandAction implements ActionListener{
public void actionPerformed(ActionEvent e) {
String command = e.getActionCommand();
if(start){
if(command.equals("-")){
display.setText(command);
start = false;
}else{
lastCommand = command;
}
}else{
calculate(Double.parseDouble(display.getText()));
lastCommand = command;
start = true;
}
}
}
private class ResetAction implements ActionListener{
public void actionPerformed(ActionEvent e) {
display.setText("0");
}
}
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);
}
}
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