import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;
import java.util.LinkedList;
import java.text.NumberFormat;
public class ComputerPad extends Frame implements ActionListener
//Download by http://www.codefans.net
{
NumberButton numberButton[];
OperationButton oprationButton[];
Button 小数点按钮,正负号按钮,退格按钮,
求倒数按钮,等号按钮,清零按钮;
Panel panel;
JTextField resultShow;
String 运算符号[]={"+","-","*","/"};
LinkedList 链表;
boolean 是否按下等号=false;
public ComputerPad()
{
super("计算器");
链表=new LinkedList();
numberButton=new NumberButton[10];
for(int i=0;i<=9;i++)
{
numberButton[i]=new NumberButton(i);
numberButton[i].addActionListener(this);
}
oprationButton=new OperationButton[4];
for(int i=0;i<4;i++)
{
oprationButton[i]=new OperationButton(运算符号[i]);
oprationButton[i].addActionListener(this);
}
小数点按钮=new Button(".");
正负号按钮 =new Button("+/-");
等号按钮=new Button("=");
求倒数按钮=new Button("1/x");
退格按钮=new Button("退格");
清零按钮=new Button("C");
清零按钮.setForeground(Color.red);
退格按钮.setForeground(Color.red);
等号按钮.setForeground(Color.red);
求倒数按钮.setForeground(Color.blue);
正负号按钮.setForeground(Color.blue);
小数点按钮.setForeground(Color.blue);
退格按钮.addActionListener(this);
清零按钮.addActionListener(this);
等号按钮.addActionListener(this);
小数点按钮.addActionListener(this);
正负号按钮.addActionListener(this);
求倒数按钮.addActionListener(this);
resultShow=new JTextField(10);
resultShow.setHorizontalAlignment(JTextField.RIGHT);
resultShow.setForeground(Color.blue);
resultShow.setFont(new Font("TimesRoman",Font.PLAIN,14));
resultShow.setBorder(new SoftBevelBorder(BevelBorder.LOWERED));
resultShow.setBackground(Color.white);
resultShow.setEditable(false);
panel=new Panel();
panel.setLayout(new GridLayout(4,5));
panel.add(numberButton[1]);
panel.add(numberButton[2]);
panel.add(numberButton[3]);
panel.add(oprationButton[0]);
panel.add(清零按钮);
panel.add(numberButton[4]);
panel.add(numberButton[5]);
panel.add(numberButton[6]);
panel.add(oprationButton[1]);
panel.add(退格按钮);
panel.add(numberButton[7]);
panel.add(numberButton[8]);
panel.add(numberButton[9]);
panel.add(oprationButton[2]);
panel.add(求倒数按钮);
panel.add(numberButton[0]);
panel.add(正负号按钮);
panel.add(小数点按钮);
panel.add(oprationButton[3]);
panel.add(等号按钮);
add(panel,BorderLayout.CENTER);
add(resultShow,BorderLayout.NORTH);
addWindowListener(new WindowAdapter()
{ public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});
setVisible(true);
setBounds(100,50,240,180);
setResizable(false);
validate();
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource() instanceof NumberButton)
{
NumberButton b=(NumberButton)e.getSource();
if(链表.size()==0)
{
int number=b.getNumber();
链表.add(""+number);
resultShow.setText(""+number);
是否按下等号=false;
}
else if(链表.size()==1&&是否按下等号==false)
{
int number=b.getNumber();
String num=(String)链表.getFirst();
String s=num.concat(""+number);
链表.set(0,s);
resultShow.setText(s);
}
else if(链表.size()==1&&是否按下等号==true)
{
int number=b.getNumber();
链表.removeFirst();
链表.add(""+number);
是否按下等号=false;
resultShow.setText(""+number);
}
else if(链表.size()==2)
{
int number=b.getNumber();
链表.add(""+number);
resultShow.setText(""+number);
}
else if(链表.size()==3)
{
int number=b.getNumber();
String num=(String)链表.getLast();
String s=num.concat(""+number);
链表.set(2,s);
resultShow.setText(s);
}
}
else if(e.getSource() instanceof OperationButton)
{
OperationButton b=(OperationButton)e.getSource();
if(链表.size()==1)
{
String fuhao=b.get运算符号();
链表.add(fuhao);
}
else if(链表.size()==2)
{
String fuhao=b.get运算符号();
链表.set(1,fuhao);
}
else if(链表.size()==3)
{
String fuhao=b.get运算符号();
String number1=(String)链表.getFirst();
String number2=(String)链表.getLast();
String 运算符号=(String)链表.get(1);
try
{
double n1=Double.parseDouble(number1);
double n2=Double.parseDouble(number2);
double n=0;
if(运算符号.equals("+"))
{
n=n1+n2;
}
else if(运算符号.equals("-"))
{
n=n1-n2;
}
else if(运算符号.equals("*"))
{
n=n1*n2;
}
else if(运算符号.equals("/"))
{
n=n1/n2;
}
链表.clear();
链表.add(""+n);
链表.add(fuhao);
resultShow.setText(""+n);
}
catch(Exception ee)
{
}
}
}
else if(e.getSource()==等号按钮)
{
是否按下等号=true;
if(链表.size()==1||链表.size()==2)
{
String num=(String)链表.getFirst();
resultShow.setText(""+num);
}
else if(链表.size()==3)
{
String number1=(String)链表.getFirst();
String number2=(String)链表.getLast();
String 运算符号=(String)链表.get(1);
try
{
double n1=Double.parseDouble(number1);
double n2=Double.parseDouble(number2);
double n=0;
if(运算符号.equals("+"))
{
n=n1+n2;
}
else if(运算符号.equals("-"))
{
n=n1-n2;
}
else if(运算符号.equals("*"))
{
n=n1*n2;
}
else if(运算符号.equals("/"))
{
n=n1/n2;
}
resultShow.setText(""+n);
链表.set(0,""+n);
链表.removeLast();
链表.removeLast();
}
catch(Exception ee)
{
}
}
}
else if(e.getSource()==小数点按钮)
{
if(链表.size()==0)
{
是否按下等号=false;
}
else if(链表.siz
