Cadev.java

import java.awt.*

import java.awt.event.*

import javax.swing.*

import java.util.LinkedList

import java.text.NumberFormat

import javax.swing.border.*

public class Cadev extends JFrame implements ActionListener

{

Nbtn nbtn[]

Obtn obtn[]

Button dotbtn,PlusOrMinusbtn,Backspacebtn,

recbtn,equbtn,clbtn

JPanel panel

JTextField resultShow

String Oper[]={"+","-","*","/"}

LinkedList link

boolean sfcequ=false

public Cadev()

{

super("计算器")

link=new LinkedList()

nbtn=new Nbtn[10]

for(int i=0i<=9i++)

{

nbtn[i]=new Nbtn(i)

nbtn[i].addActionListener(this)

}

obtn=new Obtn[4]

for(int i=0i<4i++)

{

obtn[i]=new Obtn(Oper[i])

obtn[i].addActionListener(this)

}

dotbtn=new Button(".")

PlusOrMinusbtn=new Button("+/-")

equbtn=new Button("=")

recbtn=new Button("1/x")

Backspacebtn=new Button("退格")

clbtn=new Button("C")

recbtn.setForeground(Color.blue)

dotbtn.setForeground(Color.blue)

PlusOrMinusbtn.setForeground(Color.blue)

equbtn.setForeground(Color.red)

Backspacebtn.setForeground(Color.red)

clbtn.setForeground(Color.red)

dotbtn.addActionListener(this)

PlusOrMinusbtn.addActionListener(this)

equbtn.addActionListener(this)

recbtn.addActionListener(this)

Backspacebtn.addActionListener(this)

clbtn.addActionListener(this)

resultShow=new JTextField(10)

resultShow.setHorizontalAlignment(JTextField.RIGHT)

resultShow.setFont(new Font("TimesRoman",Font.PLAIN,14))

resultShow.setBorder(new SoftBevelBorder(BevelBorder.LOWERED))

resultShow.setBackground(Color.white)

resultShow.setEditable(false)

panel=new JPanel()

panel.setLayout(new GridLayout(4,5))

panel.add(nbtn[1])

panel.add(nbtn[2])

panel.add(nbtn[3])

panel.add(obtn[0])

panel.add(clbtn)

panel.add(nbtn[4])

panel.add(nbtn[5])

panel.add(nbtn[6])

panel.add(obtn[1])

panel.add(Backspacebtn)

panel.add(nbtn[7])

panel.add(nbtn[8])

panel.add(nbtn[9])

panel.add(obtn[2])

panel.add(recbtn)

panel.add(nbtn[0])

panel.add(PlusOrMinusbtn)

panel.add(dotbtn)

panel.add(obtn[3])

panel.add(equbtn)

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 Nbtn)

{

Nbtn b=(Nbtn)e.getSource()

if(link.size()==0)

{

int num=b.getNum()

link.add(""+num)

resultShow.setText(""+num)

sfcequ=false

}

else if(link.size()==1&&sfcequ==false)

{

int num=b.getNum()

String Number=(String)link.getFirst()

String s=Number.concat(""+num)

link.set(0,s)

resultShow.setText(s)

}

else if(link.size()==1&&sfcequ==true)

{

int num=b.getNum()

link.removeFirst()

link.add(""+num)

sfcequ=false

resultShow.setText(""+num)

}

else if(link.size()==2)

{

int num=b.getNum()

link.add(""+num)

resultShow.setText(""+num)

}

else if(link.size()==3)

{

int num=b.getNum()

String Number=(String)link.getLast()

String s=Number.concat(""+num)

link.set(2,s)

resultShow.setText(s)

}

}

else if(e.getSource() instanceof Obtn)

{

Obtn b=(Obtn)e.getSource()

if(link.size()==1)

{

String sign=b.getOper()

link.add(sign)

}

else if(link.size()==2)

{

String sign=b.getOper()

link.set(1,sign)

}

else if(link.size()==3)

{

String sign=b.getOper()

String num1=(String)link.getFirst()

String num2=(String)link.getLast()

String Oper=(String)link.get(1)

try

{

double n1=Double.parseDouble(num1)

double n2=Double.parseDouble(num2)

double n=0

if(Oper.equals("+"))

{

n=n1+n2

}

else if(Oper.equals("-"))

{

n=n1-n2

}

else if(Oper.equals("*"))

{

n=n1*n2

}

else if(Oper.equals("/"))

{

n=n1/n2

}

link.clear()

link.add(""+n)

link.add(sign)

resultShow.setText(""+n)

}

catch(Exception ee)

{

}

}

}

else if(e.getSource()==equbtn)

{

sfcequ=true

if(link.size()==1||link.size()==2)

{

String num=(String)link.getFirst()

resultShow.setText(""+num)

}

else if(link.size()==3)

{

String num1=(String)link.getFirst()

String num2=(String)link.getLast()

String sign=(String)link.get(1)

try

{

double n1=Double.parseDouble(num1)

double n2=Double.parseDouble(num2)

double n=0

if(sign.equals("+"))

{

n=n1+n2

}

else if(sign.equals("-"))

{

n=n1-n2

}

else if(sign.equals("*"))

{

n=n1*n2

}

else if(sign.equals("/"))

{

n=n1/n2

}

resultShow.setText(""+n)

link.set(0,""+n)

link.removeLast()

link.removeLast()

}

catch(Exception ee)

{

}

}

}

else if(e.getSource()==dotbtn)

{

if(link.size()==0)

{

sfcequ=false

}

else if(link.size()==1)

{

String dot=dotbtn.getLabel()

String num=(String)link.getFirst()

String s=null

if(num.indexOf(dot)==-1)

{

s=num.concat(dot)

link.set(0,s)

}

else

{

s=num

}

link.set(0,s)

resultShow.setText(s)

}

else if(link.size()==3)

{

String dot=dotbtn.getLabel()

String num=(String)link.getLast()

String s=null

if(num.indexOf(dot)==-1)

{

s=num.concat(dot)

link.set(2,s)

}

else

{

s=num

}

resultShow.setText(s)

}

}

else if(e.getSource()==Backspacebtn)

{

if(link.size()==1)

{

String num=(String)link.getFirst()

if(num.length()>=1)

{

num=num.substring(0,num.length()-1)

link.set(0,num)

resultShow.setText(num)

}

else

{

link.removeLast()

resultShow.setText("0")

}

}

else if(link.size()==3)

{

String num=(String)link.getLast()

if(num.length()>=1)

{

num=num.substring(0,num.length()-1)

link.set(0,num)

resultShow.setText(num)

}

else

{

link.removeLast()

resultShow.setText("0")

}

}

}

else if(e.getSource()==PlusOrMinusbtn)

{

if(link.size()==1)

{

String num1=(String)link.getFirst()

try

{

double d=Double.parseDouble(num1)

d=-1*d

String str=String.valueOf(d)

link.set(0,str)

resultShow.setText(str)

}

catch(Exception ee)

{

}

}

else if(link.size()==3)

{

String num2=(String)link.getLast()

try

{

double d=Double.parseDouble(num2)

d=-1*d

String str=String.valueOf(d)

link.set(2,str)

resultShow.setText(str)

}

catch(Exception ee)

{

}

}

}

else if(e.getSource()==recbtn)

{

if(link.size()==1||link.size()==2)

{

String num1=(String)link.getFirst()

try

{

double d=Double.parseDouble(num1)

d=1.0/d

String str=String.valueOf(d)

link.set(0,str)

resultShow.setText(str)

}

catch(Exception ee)

{

}

}

else if(link.size()==3)

{

String num2=(String)link.getLast()

try

{

double d=Double.parseDouble(num2)

d=1.0/d

String str=String.valueOf(d)

link.set(0,str)

}

catch(Exception ee)

{

}

}

}

else if(e.getSource()==clbtn)

{

sfcequ=false

resultShow.setText("0")

link.clear()

}

}

public static void main(String agrs[])

{

new Cadev()

}

}

Nbtn.java

import java.awt.*

import java.awt.event.*

import javax.swing.*

public class Nbtn extends Button

{

int Num

public Nbtn(int n)

{

super(""+n)

Num=n

setForeground(Color.blue)

}

public int getNum()

{

return Num

}

}

Obtn.java

import java.awt.*

import java.awt.event.*

import javax.swing.*

public class Obtn extends Button

{

String Oper

public Obtn(String s)

{

super(s)

Oper=s

setForeground(Color.red)

}

public String getOper()

{

return Oper

}

}