?? caculater.java
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import java.awt.*;
import java.awt.event.*;
import java.applet.*;
//定義Caculater類
public class Caculater extends Applet
{
private NumPanel nums;
private OperationPanel myoperation;
static TextField display;
static String s = new String();
//初始化
public void init()
{
setLayout(new BorderLayout());
setBackground(new Color(105,105,105));
myoperation = new OperationPanel();
myoperation.setFont(new Font("SansSerif", Font.BOLD, 14));
add(BorderLayout.EAST, myoperation);
nums = new NumPanel();
nums.setFont(new Font("SansSerif", Font.BOLD, 14));
add(BorderLayout.WEST, nums);
display = new TextField();
display.setEditable(false);
display.setBackground(Color.yellow);
display.setFont(new Font("SansSerif", Font.BOLD, 14));
add(BorderLayout.NORTH, display);
}
}
//定義NumPanel類
class NumPanel extends Panel implements ActionListener
{
static boolean point = false;
static short count = 0;
private Button b0 = new Button(" 7 "),
b1 = new Button(" 8 "),
b2 = new Button(" 9 "),
b3 = new Button(" 4 "),
b4 = new Button(" 5 "),
b5 = new Button(" 6 "),
b6 = new Button(" 1 "),
b7 = new Button(" 2 "),
b8 = new Button(" 3 "),
b9 = new Button(" 0 "),
bpoint = new Button(" . ");
//構造函數
public NumPanel()
{
b0.addActionListener(this);
b1.addActionListener(this);
b2.addActionListener(this);
b3.addActionListener(this);
b4.addActionListener(this);
b5.addActionListener(this);
b6.addActionListener(this);
b7.addActionListener(this);
b8.addActionListener(this);
b9.addActionListener(this);
bpoint.addActionListener(this);
//實例化Panel對象
Panel p1 = new Panel();
p1.setLayout(new GridLayout(4,3,10,10));
p1.add(b0);
p1.add(b1);
p1.add(b2);
p1.add(b3);
p1.add(b4);
p1.add(b5);
p1.add(b6);
p1.add(b7);
p1.add(b8);
p1.add(b9);
p1.add(bpoint);
add(p1);
}
//處理事件
public void actionPerformed(ActionEvent e)
{
Object source = e.getSource();
if (source==b0)
{
count++;
Caculater.s= Caculater.display.getText();
Caculater.s= Caculater.s+ 7;
Caculater.display.setText(Caculater.s);
}
else if (source == b1)
{
count++;
Caculater.s= Caculater.display.getText();
Caculater.s= Caculater.s+ 8;
Caculater.display.setText(Caculater.s);
}
else if (source == b2)
{
count++;
Caculater.s= Caculater.display.getText();
Caculater.s= Caculater.s+ 9;
Caculater.display.setText(Caculater.s);
}
else if (source == b3)
{
count++;
Caculater.s= Caculater.display.getText();
Caculater.s= Caculater.s+ 4;
Caculater.display.setText(Caculater.s);
}
else if (source == b4)
{
count++;
Caculater.s= Caculater.display.getText();
Caculater.s= Caculater.s+ 5;
Caculater.display.setText(Caculater.s);
}
else if (source == b5)
{
count++;
Caculater.s= Caculater.display.getText();
Caculater.s= Caculater.s+ 6;
Caculater.display.setText(Caculater.s);
}
else if (source == b6)
{
count++;
Caculater.s= Caculater.display.getText();
Caculater.s= Caculater.s+ 1;
Caculater.display.setText(Caculater.s);
}
else if (source == b7)
{
count++;
Caculater.s= Caculater.display.getText();
Caculater.s= Caculater.s+ 2;
Caculater.display.setText(Caculater.s);
}
else if (source == b8)
{
count++;
Caculater.s= Caculater.display.getText();
Caculater.s= Caculater.s+ 3;
Caculater.display.setText(Caculater.s);
}
else if (source == b9)
{
if (count ==0)
{
Caculater.s= Caculater.display.getText();
Caculater.s= Caculater.s+ "0.";
Caculater.display.setText(Caculater.s);
count++;
}
else
{
Caculater.s= Caculater.display.getText();
Caculater.s= Caculater.s+ 0;
Caculater.display.setText(Caculater.s);
count++;
}
}
else if (source == bpoint)
{
if (point == false)
{
count++;
Caculater.s= Caculater.display.getText();
Caculater.s= Caculater.s+ ".";
Caculater.display.setText(Caculater.s);
point = true;
}
else
return;
}
}
}
//定義OperationPanel類
class OperationPanel extends Panel implements ActionListener
{
Double i;
double temp = 0.0;
private short opera = 0;
private short counter = 0;
private double result = 0;
private Button plus = new Button(" + "),
minus = new Button(" - "),
clear = new Button (" C "),
ac = new Button (" AC "),
times = new Button(" X "),
divide = new Button(" / "),
equals = new Button(" = "),
sto = new Button (" STO "),
rcl = new Button (" RCL "),
square = new Button(" SQRT ");
//構造函數
public OperationPanel()
{
setLayout(new GridLayout(5,2,10,10));
add(clear);
add(ac);
add(sto);
add(rcl);
add(plus);
add(minus);
add(times);
add(divide);
add(square);
add(equals);
clear.addActionListener(this);
ac.addActionListener(this);
plus.addActionListener(this);
minus.addActionListener(this);
times.addActionListener(this);
divide.addActionListener(this);
equals.addActionListener(this);
square.addActionListener(this);
sto.addActionListener(this);
rcl.addActionListener(this);
}
//加法運算
public void addition()
{
if (counter==0)
{
i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result + i.doubleValue();
counter++;
opera=1;
}
else if (counter !=0 && opera==1 )
{
i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result + i.doubleValue();
opera = 1;
}
else if (counter !=0 && opera==2 )
{
i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result - i.doubleValue();
opera = 1;
}
else if (counter !=0 && opera==3 )
{ i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result * i.doubleValue();
opera = 1;
}
else if (counter !=0 && opera==4 )
{ i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result/ i.doubleValue();
opera = 1;
}
}
//減法運算
public void minus()
{
if (counter==0)
{
i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result + i.doubleValue();
counter++;
opera=2;
}
else if (counter !=0 && opera==2 )
{
i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result - i.doubleValue();
opera = 2;
}
else if (counter !=0 && opera==1 )
{ i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result + i.doubleValue();
opera = 2;
}
else if (counter !=0 && opera==3 )
{i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result * i.doubleValue();
opera = 2;
}
else if (counter !=0 && opera==4 )
{ i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result/ i.doubleValue();
opera = 2;
}
}
//乘法運算
public void times()
{
if (counter==0)
{
i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result + i.doubleValue();
counter++;
opera=3;
}
else if (counter !=0 && opera==3 )
{
i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result * i.doubleValue();
opera = 3;
}
else if (counter !=0 && opera==1 )
{ i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result + i.doubleValue();
opera = 3;
}
else if (counter !=0 && opera==2 )
{i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result - i.doubleValue();
opera = 3;
}
else if (counter !=0 && opera==4 )
{i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result/ i.doubleValue();
opera = 3;
}
}
//除法運算
public void divide()
{
if (counter==0)
{
i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result + i.doubleValue();
counter++;
opera=4;
}
else if (counter !=0 && opera==4 )
{
i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result / i.doubleValue();
opera = 4;
}
else if (counter !=0 && opera==1 )
{i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result + i.doubleValue();
opera = 4;
}
else if (counter !=0 && opera==2 )
{i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result - i.doubleValue();
opera = 4;
}
else if (counter !=0 && opera==3 )
{i = new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result* i.doubleValue();
opera = 4;
}
}
//等于號
public void equals()
{
if (opera==1)
{
i= new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result + i.doubleValue();
Caculater.display.setText(""+ result);
}
else if (opera==2)
{
i= new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result - i.doubleValue();
Caculater.display.setText(""+ result);
}
else if(opera ==3)
{
i= new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result * i.doubleValue();
Caculater.display.setText(""+ result);
}
else if(opera ==4)
{
i= new Double (Caculater.display.getText());
Caculater.display.setText("");
result = result / i.doubleValue();
Caculater.display.setText(""+ result);
}
counter = 0;
result = 0;
}
//清零
public void clear()
{
plus.setEnabled(true);
minus.setEnabled(true);
times.setEnabled(true);
divide.setEnabled(true);
equals.setEnabled(true);
ac.setEnabled(true);
Caculater.display.setText("0.0");
i = new Double (Caculater.display.getText());
Caculater.display.setText("");
NumPanel.point = false;
result = 0.0;
counter = 0;
opera = 0;
}
//平方根運算
public void square()
{
i= new Double (Caculater.display.getText());
result = i.doubleValue();
Caculater.display.setText(""+Math.sqrt(result));
clear.addActionListener(this);
plus.setEnabled(false);
minus.setEnabled(false);
times.setEnabled(false);
divide.setEnabled(false);
equals.setEnabled(false);
ac.setEnabled(false);
}
public void ac()
{
NumPanel.point = false;
Caculater.display.setText("");
}
public void sto()
{
i= new Double (Caculater.display.getText());
temp = i.doubleValue();
}
public void rcl()
{
NumPanel.point = true;
Caculater.display.setText(""+ temp);
}
//事件處理
public void actionPerformed(ActionEvent e)
{
Object source = e.getSource();
if (source==plus)
{
NumPanel.count = 0;
NumPanel.point = false;
addition();
}
if (source==minus)
{
NumPanel.count = 0;
NumPanel.point = false;
minus();
}
if (source==times)
{
NumPanel.count = 0;
NumPanel.point = false;
times();
}
if (source==divide)
{
NumPanel.count = 0;
NumPanel.point = false;
divide();
}
if (source==equals)
{
NumPanel.point = true;
equals();
}
if (source==clear)
{
NumPanel.count = 0;
clear();
}
if (source == square)
{
NumPanel.point = true;
square();
}
if (source == ac)
{
NumPanel.count = 0;
ac();
}
if (source == sto)
{
sto();
}
if (source == rcl)
{
rcl();
}
}
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