import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import javax.swing.JTextField;
import java.awt.Color;
public class createFrame
{
Frame f;
JTextField text,text2;
Button b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12,b13,b14,b15,b16,b17,
b18,b19,b20,b21,b22,b23,b24,b25,b26,b27;
double op1,op2,op2x,op3;//运算的三个数：op1,op2是运算数，op3是运算结果
char op=0,opx=0,opp=0;//运算操作符
boolean b=false;//我按过0键了，下次该按.了
boolean c=false;//按过运算符了，下次按数字时该清屏显示
boolean firstdeng=true;//第一次做=
double mjia=0;
public static void main(String[] args)
{
createFrame cf=new createFrame();
cf.createWindow();
}
public void createWindow()
{
f = new Frame("calculator");
f.setBackground(Color.LIGHT_GRAY);
// 增加关闭事件的监听器
this.shutwindow(f);
text=new JTextField();
text.setHorizontalAlignment(JTextField.RIGHT);
text.setSize(250,22);
text.setLocation(5,25);
text.setEditable(false);
text.setBackground(Color.WHITE);
text.setText("0.");
text2=new JTextField();
text2.setHorizontalAlignment(JTextField.CENTER);
text2.setSize(37,22);
text2.setLocation(5,50);
text2.setEditable(false);
text2.setText("");
text2.setBackground(Color.LIGHT_GRAY);
b1 = new Button("BackSpace");
b1.setSize(70,22);
b1.setLocation(52,50);
b2 = new Button("CE");
b2.setSize(60,22);
b2.setLocation(128,50);
b3 = new Button("C");
b3.setSize(60,22);
b3.setLocation(194,50);
b4 = new Button("MC");
b4.setSize(37,22);
b4.setLocation(5,75);
b5 = new Button("7");
b5.setSize(37,22);
b5.setLocation(50,75);
b6 = new Button("8");
b6.setSize(37,22);
b6.setLocation(93,75);
b7 = new Button("9");
b7.setSize(37,22);
b7.setLocation(136,75);
b8 = new Button("/");
b8.setSize(37,22);
b8.setLocation(179,75);
b9 = new Button("sqrt");
b9.setSize(37,22);
b9.setLocation(218,75);
b10 = new Button("MR");
b10.setSize(37,22);
b10.setLocation(5,100);
b11 = new Button("4");
b11.setSize(37,22);
b11.setLocation(50,100);
b12 = new Button("5");
b12.setSize(37,22);
b12.setLocation(93,100);
b13 = new Button("6");
b13.setSize(37,22);
b13.setLocation(136,100);
b14 = new Button("*");
b14.setSize(37,22);
b14.setLocation(179,100);
b15 = new Button("%");
b15.setSize(37,22);
b15.setLocation(218,100);
b16 = new Button("MS");
b16.setSize(37,22);
b16.setLocation(5,125);
b17 = new Button("1");
b17.setSize(37,22);
b17.setLocation(50,125);
b18 = new Button("2");
b18.setSize(37,22);
b18.setLocation(93,125);
b19 = new Button("3");
b19.setSize(37,22);
b19.setLocation(136,125);
b20 = new Button("-");
b20.setSize(37,22);
b20.setLocation(179,125);
b21 = new Button("1/x");
b21.setSize(37,22);
b21.setLocation(218,125);
b22 = new Button("M+");
b22.setSize(37,22);
b22.setLocation(5,150);
b23 = new Button("0");
b23.setSize(37,22);
b23.setLocation(50,150);
b24 = new Button("+/-");
b24.setSize(37,22);
b24.setLocation(93,150);
b25 = new Button(".");
b25.setSize(37,22);
b25.setLocation(136,150);
b26 = new Button("+");
b26.setSize(37,22);
b26.setLocation(179,150);
b27 = new Button("=");
b27.setSize(37,22);
b27.setLocation(218,150);
f.setLayout(null);
f.add(text);
f.add(text2);
b1.addActionListener(new ButtonHandler());
b2.addActionListener(new ButtonHandler());
b3.addActionListener(new ButtonHandler());
b4.addActionListener(new ButtonHandler());
b5.addActionListener(new ButtonHandler());
b6.addActionListener(new ButtonHandler());
b7.addActionListener(new ButtonHandler());
b8.addActionListener(new ButtonHandler());
b9.addActionListener(new ButtonHandler());
b10.addActionListener(new ButtonHandler());
b11.addActionListener(new ButtonHandler());
b12.addActionListener(new ButtonHandler());
b13.addActionListener(new ButtonHandler());
b14.addActionListener(new ButtonHandler());
b15.addActionListener(new ButtonHandler());
b16.addActionListener(new ButtonHandler());
b17.addActionListener(new ButtonHandler());
b18.addActionListener(new ButtonHandler());
b19.addActionListener(new ButtonHandler());
b20.addActionListener(new ButtonHandler());
b21.addActionListener(new ButtonHandler());
b22.addActionListener(new ButtonHandler());
b23.addActionListener(new ButtonHandler());
b24.addActionListener(new ButtonHandler());
b25.addActionListener(new ButtonHandler());
b26.addActionListener(new ButtonHandler());
b27.addActionListener(new ButtonHandler());
f.add(b1);
f.add(b2);
f.add(b3);
f.add(b4);
f.add(b5);
f.add(b6);
f.add(b7);
f.add(b8);
f.add(b9);
f.add(b10);
f.add(b11);
f.add(b12);
f.add(b13);
f.add(b14);
f.add(b15);
f.add(b16);
f.add(b17);
f.add(b18);
f.add(b19);
f.add(b20);
f.add(b21);
f.add(b22);
f.add(b23);
f.add(b24);
f.add(b25);
f.add(b26);
f.add(b27);
f.setResizable(false);
f.setSize(260,180);
//窗口居中显示
this.centershow(260,180,f);
f.setVisible(true);
}
public void centershow(int x,int y,Frame f)
{
//窗口居中显示
Toolkit tk=Toolkit.getDefaultToolkit();
Dimension d=tk.getScreenSize();
int screenHeight=d.height;
int screenWidth=d.width;
f.setLocation((screenWidth-x)/2,(screenHeight-y)/2);
}
public void shutwindow(Frame f)
{
//Add a listener for the close event
f.addWindowListener(new WindowAdapter(){
public void windowClosing(WindowEvent evt)
{
// 退出程序
System.exit(0);
}
});
}
public double getCurrentNum()//得到当前文本框内数字
{
return 1;
}
//四则运算
public double calculateNow(double op1,char op,double op2)
{
double op1b=0.0;
switch(op)
{
case '+':
op1b=op1+op2;
break;
case '-':
op1b=op1-op2;
break;
case '*':
op1b=op1*op2;
break;
case '/':
if(op2==0.0)
op1b=op1;
else
op1b=op1/op2;
break;
case '%':
if(op2==0.0)
op1b=op1;
else
op1b=op1%op2;
break;
case 0:
op1b=op2;
break;
}
return op1b;
}
class ButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
System.out.println("Button's lable is :" + e.getActionCommand()+"||"
+createFrame.this.op1
+createFrame.this.op
+createFrame.this.op2
+"="
+createFrame.this.op3);
String command=e.getActionCommand();
String currentText=text.getText();
if(currentText.equals("函数输入无效.") || currentText.equals("除数不能为零."))
{
currentText="0.";
text.setText(currentText);
}
if(command=="BackSpace")
{
if(currentText.length()>1)
currentText=currentText.substring(0,currentText.length()-1);
else if(currentText.length()<=1)
{
currentText="0.";
}
text.setText(currentText);
}
if(command=="CE")
{
text.setText("0.");
op2=0.0;
//return;
}
if(command=="C")
{
text.setText("0.");
op3=0.0;
op1=0.0;
op2=0.0;
op2x=0.0;
op=0;
opx=0;
opp=0;
firstdeng=true;
b=false;
c=false;
}
if(command=="0")
{
if(text.getText().equals("0."))
{
text.setText("0.");
b=true;
}
else
text.setText(currentText+"0");
}
if(command=="1")
{
if(c)
{
c=false;
text.setText("1");
return;
}
if((text.getText().equals("0.") || text.getText().equals("0")) & !b)
text.setText("1");
else
text.setText(currentText+"1");
}
if(command=="2")
{
if(c)
{
text.setText("2");
c=false;
return;
}
if((text.getText().equals("0.") || text.getText().equals("0")) & !b)
text.setText("2");
else
text.setText(currentText+"2");
//return;
}
if(command=="3")
{
if(c)
{
c=false;
text.setText("3");
return;
}
if((text.getText().equals("0.") || text.getText().equals("0")) & !b)
text.setText("3");
else
text.setText(currentText+"3");
//return;
}
if(command=="4")
{
if(c)
{
c=false;
text.setText("4");
return;
}
if((text.getText().equals("0.") || text.getText().equals("0")) & !b)
text.setText("4");
else
text.setText(currentText+"4");
//return;
}
if(command=="5")
{
if(c)
{
c=false;
text.setText("5");
return;
}
if((text.getText().equals("0.") || text.getText().equals("0")) & !b)
text.setText("5");
else
text.setText(currentText+"5");
//return;
}
if(command=="6")
{
if(c)
{
c=false;
text.setText("6");
return;
}
if((text.getText().equals("0.") || text.getText().equals("0")) & !b)
text.setText("6");
else
text.setText(currentText+"6");
//return;
}
if(command=="7")
{
if(c)
{
c=false;
text.setText("7");
return;
}
if((text.getText().equals("0.") || text.getText().equals("0")) & !b)
text.setText("7");
else
text.setText(currentText+"7");
//return;
}
if(command=="8")
{
if(c)
{
c=false;
text.setText("8");
return;
}
if((text.getText().equals("0.") || text.getText().equals("0")) & !b)
text.setText("8");
else
text.setText(currentText+"8");
//return;
}
if(command=="9")
{
if(c)
{
c=false;
text.setText("9");
return;
}
if((text.getText().equals("0.") || text.getText().equals("0")) & !b)
text.setText("9");
else
text.setText(currentText+"9");
}
if(command=="/")
{
op2=Double.valueOf(text.getText()).doubleValue();
if(opp!='=')
{
op1=calculateNow(op1,op,op2);
opp='/';
}
op='/';
opx='/';
text.setText(String.valueOf(op1));
c=true;
//b=false;
firstdeng=true;
}
if(command=="*")
{
op2=Double.valueOf(text.getText()).doubleValue();
if(opp!='=')
{
op1=calculateNow(op1,op,op2);
opp='*';
}
op='*';
opx='*';
text.setText(String.valueOf(op1));
c=true;
firstdeng=true;
}
if(command=="-")
{
op2=Double.valueOf(text.getText()).doubleValue();
if(opp!='=')
{
op1=calculateNow(op1,op,op2);
opp='-';
}
op='-';
opx='-';
text.setText(String.valueOf(op1));
c=true;
firstdeng=true;
}
if(command=="+")
{
op2=Double.valueOf(text.getText()).doubleValue();
if(opp!='=')
{
op1=calculateNow(op1,op,op2);
opp='+';
}
op='+';
opx='+';
text.setText(String.valueOf(op1));
c=true;
firstdeng=true;
}
if(command==".")
{
if(text.getText().indexOf('.')>1)
return;
else if(text.getText().indexOf('.')==-1)
{
text.setText(currentText+".");
b=true;
}
else if(text.getText().indexOf('.')==1)
b=true;
}
if(command=="+/-")
{
if(Double.valueOf(text.getText()).doubleValue()!=0)
{
double d=-Double.valueOf(text.getText()).doubleValue();
text.setText(String.valueOf(d));
op2=d;
op2x=d;
}
}
if(command=="%")
{
op2=Double.valueOf(text.getText()).doubleValue();
if(op1!=0 & op2!=0)
{
double temp=op1*op2;
temp=temp/100;
text.setText(String.valueOf(temp));
}
}
if(command=="sqrt")
{
double in=Double.valueOf(text.getText()).doubleValue();
if(in<0)
text.setText("函数输入无效.");
else
{
double sd=Math.sqrt(in);
text.setText(String.valueOf(sd));
op2=sd;
op2x=sd;
}
}
if(command=="1/x")
{
double in=Double.valueOf(text.getText()).doubleValue();
if(in==0)
text.setText("除数不能为零.");
else
{
double sd=1/in;
text.setText(String.valueOf(sd));
op2=sd;
op2x=sd;
}
}
if(command=="=")
{
op2=Double.valueOf(text.getText()).doubleValue();
System.out.println("=========="+op2);
if(firstdeng)
{
op2x=op2;
firstdeng=false;
}
op1=calculateNow(op1,op,op2x);
opp='=';
text.setText(String.valueOf(op1));
}
if(command=="MC")
{
mjia=0;
text2.setText("");
}
if(command=="MR")
{
text.setText(String.valueOf(mjia));
}
if(command=="MS")
{
mjia=Double.valueOf(text.getText()).doubleValue();
text2.setText("M");
}
if(command=="M+")
{
mjia=mjia+Double.valueOf(text.getText()).doubleValue();
}
}
}
}
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