我有一个标准计算器和一个用java创建的科学计算器,都有菜单栏和菜单项“标准”和“科学”在两者之间切换,但我不知道如何让计算器在单击选项。
到目前为止的代码:
import java.awt.FlowLayout;
import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class regCalc implements ActionListener
{
JFrame frame = new JFrame ("Standard Calculator");
//JPanels for standard and scientific
JPanel panelstand = new JPanel (new FlowLayout ());
JPanel panelsci = new JPanel (new FlowLayout());
JMenuBar menuBar = new JMenuBar();
JMenu view = new JMenu ("View");
JMenuItem standard = new JMenuItem("Standard");
JMenuItem scientific = new JMenuItem("Scientific");
JTextArea text = new JTextArea (1,20);
JButton but1 = new JButton ("1");
JButton but2 = new JButton ("2");
JButton but3 = new JButton ("3");
JButton but4 = new JButton ("4");
JButton but5 = new JButton ("5");
JButton but6 = new JButton ("6");
JButton but7 = new JButton ("7");
JButton but8 = new JButton ("8");
JButton but9 = new JButton ("9");
JButton but0 = new JButton ("0");
JButton butAdd = new JButton ("+");
JButton butSub = new JButton ("-");
JButton butMult = new JButton ("*");
JButton butDiv = new JButton ("/");
JButton butEq = new JButton ("=");
JButton butClear = new JButton ("C");
Double number1, number2, result;
int addc =0, subc=0, multc=0, divc=0;
public void ui()
{
frame.setVisible(true);
panelstand.setVisible(true);
panelsci.setVisible(false);
frame.setSize(270,230);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setJMenuBar(menuBar);
view.add(standard);
view.add(scientific);
menuBar.add(view);
frame.add(panelstand);
panelstand.add(text);
panelstand.add(but1);
panelstand.add(but2);
panelstand.add(but3);
panelstand.add(but4);
panelstand.add(but5);
panelstand.add(but6);
panelstand.add(but7);
panelstand.add(but8);
panelstand.add(but9);
panelstand.add(but0);
panelstand.add(butAdd);
panelstand.add(butSub);
panelstand.add(butMult);
panelstand.add(butDiv);
panelstand.add(butEq);
panelstand.add(butClear);
but1.addActionListener(this);
but2.addActionListener(this);
but3.addActionListener(this);
but4.addActionListener(this);
but5.addActionListener(this);
but6.addActionListener(this);
but7.addActionListener(this);
but8.addActionListener(this);
but9.addActionListener(this);
but0.addActionListener(this);
butAdd.addActionListener(this);
butSub.addActionListener(this);
butMult.addActionListener(this);
butDiv.addActionListener(this);
butEq.addActionListener(this);
butClear.addActionListener(this);
}
@Override
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (source == but1)
{
text.append("1");
}
if (source == but2)
{
text.append("2");
}
if (source == but3)
{
text.append("3");
}
if (source == but4)
{
text.append("4");
}
if (source == but5)
{
text.append("5");
}
if (source == but6)
{
text.append("6");
}
if (source == but7)
{
text.append("7");
}
if (source == but8)
{
text.append("8");
}
if (source == but9)
{
text.append("9");
}
if (source == but0)
{
text.append("0");
}
if (source == butAdd)
{
number1=number_Reader();
text.setText("");
addc=1;
subc=0;
multc=0;
divc=0;
}
if (source == butSub)
{
number1=number_Reader();
text.setText("");
addc=0;
subc=1;
multc=0;
divc=0;
}
if (source == butMult)
{
number1=number_Reader();
text.setText("");
addc=0;
subc=0;
multc=1;
divc=0;
}
if (source == butDiv)
{
number1=number_Reader();
text.setText("");
addc=0;
subc=0;
multc=0;
divc=1;
}
if (source == butEq)
{
number2=number_Reader();
if (addc > 0)
{
result = number1+number2;
text.setText(Double.toString(result));
}
if (subc > 0)
{
result = number1-number2;
text.setText(Double.toString(result));
}
if (multc > 0)
{
result = number1*number2;
text.setText(Double.toString(result));
}
if (divc > 0)
{
result = number1/number2;
text.setText(Double.toString(result));
}
}
if (source == butClear)
{
number1=0.0;
number2=0.0;
text.setText("");
}
if (view == scientific)
{
frame.add(scientific);
}
}
public double number_Reader()
{
double num1;
String s;
s=text.getText();
num1=Double.valueOf(s);
return num1;
}
}