import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.util.*;
class Jsqzj implements ActionListener
{
JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16;
JFrame f;
GridLayout c=new GridLayout(4,4);
JTextField tf = new JTextField();
public void init()
{
f=new JFrame("CardLayout testing");
Container ct = f.getContentPane();
tf.setHorizontalAlignment(JTextField.RIGHT);
ct.add(tf,"North");
JPanel p2=new JPanel();
ct.add(p2,"Center");
GridLayout c=new GridLayout(4,4);
p2.setLayout(c);
JButton b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16;
b1=new JButton("1");
b2=new JButton("2");
b3=new JButton("3");
b4=new JButton("4");
b5=new JButton("5");
b6=new JButton("6");
b7=new JButton("7");
b8=new JButton("8");
b9=new JButton("9");
b10=new JButton("0");
b11=new JButton(".");
b12=new JButton("=");
b13=new JButton("+");
b14=new JButton("-");
b15=new JButton("x");
b16=new JButton("/");
p2.add(b1);
b1.addActionListener(this);
p2.add(b2);
b2.addActionListener(this);
p2.add(b3);
b3.addActionListener(this);
p2.add(b13);
b13.addActionListener(this);
p2.add(b4);
b4.addActionListener(this);
p2.add(b5);
b5.addActionListener(this);
p2.add(b6);
b6.addActionListener(this);
p2.add(b14);
b14.addActionListener(this);
p2.add(b7);
b7.addActionListener(this);
p2.add(b8);
b8.addActionListener(this);
p2.add(b9);
b9.addActionListener(this);
p2.add(b15);
b15.addActionListener(this);
p2.add(b10);
b10.addActionListener(this);
p2.add(b11);
b11.addActionListener(this);
p2.add(b12);
b12.addActionListener(this);
p2.add(b16);
b16.addActionListener(this);
f.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
f.setSize(200,180);
f.setVisible(true);
}
double sum=0;
Vector v=new Vector(1,1);
Vector v2=new Vector(1,1);
public Jsqzj()
v2.addElement(new String("init"));
v.addElement(new String("init"));
public void actionPerformed(ActionEvent e)
{
String str=tf.getText();
if(e.getActionCommand()=="+") //加号的實作；
{
if(
("+").equals((String)v2.lastElement()) ||
("-").equals((String)v2.lastElement()) ||
("x").equals((String)v2.lastElement()) ||
("/").equals((String)v2.lastElement()) ||
("=").equals((String)v2.lastElement())
)
{
tf.setText(String.valueOf(sum));
}
else if(("init").equals((String)v2.lastElement()))
{
tf.setText(String.valueOf(sum));
v2.addElement(new String("="));
}
else
{
double d=Double.parseDouble(str);
if (("+").equals((String)v.lastElement()))
{
sum=sum+d;
}
else if (("-").equals((String)v.lastElement()))
{
sum=sum-d;
tf.setText(String.valueOf(sum));
}
else if(("x").equals((String)v.lastElement()))
{
sum=sum*d;
tf.setText(String.valueOf(sum));
}
else if(("/").equals((String)v.lastElement()))
{
sum=sum/d;
tf.setText(String.valueOf(sum));
}
else if(("=").equals((String)v.lastElement()))
{
sum=sum+d;
tf.setText(String.valueOf(sum));
}
else
{
sum=sum+d;
}
v.addElement(new String("+"));
v2.addElement(new String("+"));
}
if(e.getActionCommand()=="-") //減号的實作；
v.addElement(new String("-"));
v2.addElement(new String("-"));
if(e.getActionCommand()=="x") //乘号的實作；
v.addElement(new String("x"));
v2.addElement(new String("x"));
if(e.getActionCommand()=="/") //除号的實作；
v.addElement(new String("/"));
v2.addElement(new String("/"));
if (e.getActionCommand()=="=" ) //等号實作；
{
if(
{tf.setText(String.valueOf(sum));}
{
sum=sum+d;
tf.setText(String.valueOf(sum));
//tf.setText(String.valueOf(sum));
}
v.addElement(new String("="));
v2.addElement(new String("="));
}
if (e.getActionCommand()=="1" ||
e.getActionCommand()=="2" ||
e.getActionCommand()=="3" ||
e.getActionCommand()=="4" ||
e.getActionCommand()=="5" ||
e.getActionCommand()=="6" ||
e.getActionCommand()=="7" ||
e.getActionCommand()=="8" ||
e.getActionCommand()=="9" ||
e.getActionCommand()=="0" ||
e.getActionCommand()=="."
) //1，2，3，4，5，6，7，8，9，0，.的實作；
{
if(
("init").equals((String)v2.lastElement())
)
{
tf.setText("");
tf.setText(e.getActionCommand());
else if (("=").equals((String)v2.lastElement()))
sum=0;
tf.setText("");
tf.setText(e.getActionCommand());
}
else
{
tf.setText(tf.getText()+e.getActionCommand());//調用其父類中的getText()方法
}
v2.addElement(new String(e.getActionCommand()));
public static void main(String args[])
new Jsqzj().init();
}