Witam, mam pytanie jak zrobić, aby po wpisaniu danej liczby np. 728 była ona brana jako podstawa do dalszych działań? Wrzucam kod, w którym mimo napisania 728 jako podstawy używana jest tylko 7. Czy ktoś ma jakiś pomysł?
import java.awt.BorderLayout;
import java.awt.EventQueue;
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 FourP {
public static void main(String[]args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
Frame frame=new Frame();
}
});
}
}
class Frame extends JFrame
{
public Frame()
{
setBounds(100,100,250,400);
add(new CalculatorPanel());
setDefaultCloseOperation(EXIT_ON_CLOSE);
setVisible(true);
}
}
class CalculatorPanel extends JPanel{
private JButton display;
private JPanel panel;
private double result;
private String lastCommand;
private boolean start;
private boolean first;
public CalculatorPanel() {
setLayout(new BorderLayout());
result=0;
lastCommand="=";
first=true;
start=false;
display=new JButton("0");
display.setEnabled(false);
add(display, BorderLayout.PAGE_START);
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
{
@Override
public void actionPerformed(ActionEvent event) {
String input=event.getActionCommand();
if(first==true)
{
display.setText(""+input);
double l=Double.parseDouble(display.getText());
result=l;
first=false;
start=true;
}
if(start==true)
{
display.setText("");
start=false;
}
display.setText(display.getText()+input);
}
}
private class CommandAction implements ActionListener
{
@Override
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;
if(lastCommand.equals("-")) result-=x;
if(lastCommand.equals("/")) result /=x;
if(lastCommand.equals("*")) result *=x;
if(first==true) {
display.setText(display.getText());
}
else
display.setText(""+result);
}
}