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自己设计的java 计算器 大家给个意见

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


public class JavaCalculator   //3ìDòè??ú
{
	public static void main(String args[])
	{
		new Events();
	}
} 


class DefineItems   //?¨ò??÷??3￡á?±?á?
{
	Frame frmain =new Frame();
	Frame frmini =new Frame(); //?ùóD?ü???D3???mi?òminiμ??ù?a?????????÷×é?t
	Frame frabout=new Frame(); //?ùóD?ü???D3???ab?òaboutμ??ù?aabout′°?ú×é?t
	Frame frhelp =new Frame(); //°??ú??°?
	
	MenuBar mebamain=new MenuBar();
	MenuBar mebamini=new MenuBar();
	Menu memaed=new Menu("±à?-");
	Menu memavi=new Menu("2é?′");
	Menu memahe=new Menu("°??ú");
	Menu memied=new Menu("±à?-");
	Menu memivi=new Menu("2é?′");
	Menu memihe=new Menu("°??ú");
	MenuItem meitmaco=new MenuItem("?′??");
	MenuItem meitmapa=new MenuItem("?3ìù");
	MenuItem meitmama=new MenuItem("???§Dí");
	MenuItem meitmami=new MenuItem("????Dí");
	MenuItem meitmahe=new MenuItem("°??ú?÷ìa");
	MenuItem meitmaab=new MenuItem("1?óú...");
	MenuItem meitmico=new MenuItem("?′??");
	MenuItem meitmipa=new MenuItem("?3ìù");
	MenuItem meitmima=new MenuItem("???§Dí");
	MenuItem meitmimi=new MenuItem("????Dí");
	MenuItem meitmihe=new MenuItem("°??ú?÷ìa");
	MenuItem meitmiab=new MenuItem("1?óú...");
	
	JTextField tefimain=new JTextField("0");
	JTextField tefimini=new JTextField("0");
	
	Panel pamaea=new Panel();
	Panel pamawe=new Panel();
	Panel pamaeaup=new Panel();
	Panel pamaeaupfr=new Panel();
	Panel pamaeaupbe=new Panel();
	Panel pamaeace=new Panel();
	Panel pamaeado=new Panel();
	Panel pamaweup=new Panel();
	Panel pamawece=new Panel();
	Panel pamawedo=new Panel();
	Panel pami    =new Panel();
	
	CheckboxGroup jinzhi  =new CheckboxGroup();
	CheckboxGroup du      =new CheckboxGroup();
	CheckboxGroup charlong=new CheckboxGroup();
	Checkbox binsys=new Checkbox("?t????",jinzhi,false);
	Checkbox octsys=new Checkbox("°?????",jinzhi,false);
	Checkbox decsys=new Checkbox("ê?????",jinzhi,true);
	Checkbox hexsys=new Checkbox("ê?áù????",jinzhi,false);
	Checkbox ang=new Checkbox("???è",du,true);
	Checkbox rad=new Checkbox("???è",du,false);
	Checkbox gra=new Checkbox("ìY?è",du,false);
	Checkbox fou=new Checkbox("??×?",charlong,true);
	Checkbox two=new Checkbox("??×?",charlong,false);
	Checkbox one=new Checkbox("μ￥×?",charlong,false);
	Checkbox bit=new Checkbox("×??ú",charlong,false);
	Checkbox inv=new Checkbox("Inv",null,false);
	Checkbox hyp=new Checkbox("Hyp",null,false);
	
	Label  ver=new Label("Java ???§?????÷ [°?±?1.0]");
	Label  writer=new Label("Made by GreatBZhang");
	Label  texthelp[]=new Label[15]; //éè??êy×é￡?2￠·?êμày?ˉ
	
	Button manubu[] =new Button[10];
	Button minubu[] =new Button[10];
	
	Button majia    =new Button("+");
	Button majian   =new Button("-");
	Button macheng  =new Button("*");
	Button machu    =new Button("/");
	Button mapoint  =new Button(".");
	Button madeng   =new Button("=");
	Button CE       =new Button("CE");
	Button C        =new Button("C");
	Button back     =new Button("Backspace");
	Button mod      =new Button("Mod");
	Button and      =new Button("And");
	Button or       =new Button("Or");
	Button xor      =new Button("Xor");
	Button lsh      =new Button("Lsh");
	Button not      =new Button("Not");
	Button inT      =new Button("int");
	Button zhuanhuan=new Button("+|-");
	Button mc       =new Button("MC");
	Button mr       =new Button("MR");
	Button ms       =new Button("MS");
	Button mjia     =new Button("M+");
	Button pi       =new Button("pi");
	Button you      =new Button(")");
	Button zuo      =new Button("(");
	Button ln       =new Button("ln");
	Button log      =new Button("log");
	Button n        =new Button("n!");
	Button marec    =new Button("rec");
	Button exp      =new Button("Exp");
	Button xy       =new Button("x^y");
	Button x3       =new Button("x^3");
	Button x2       =new Button("x^2");
	Button fe       =new Button("F-E");
	Button dms      =new Button("dms");
	Button sin      =new Button("sin");
	Button cos      =new Button("cos");
	Button tan      =new Button("tan");
	Button sta      =new Button("Sta");
	Button ave      =new Button("Ave");
	Button sum      =new Button("Sum");
	Button s        =new Button("s");
	Button dat      =new Button("Dat");
	Button a        =new Button("A");
	Button b        =new Button("B");
	Button c        =new Button("C");
	Button d        =new Button("D");
	Button e        =new Button("E");
	Button f        =new Button("F");
	
	Button mijia     =new Button("+");
	Button mijian    =new Button("-");
	Button micheng   =new Button("*");
	Button michu     =new Button("/");
	Button mipoint   =new Button(".");
	Button mideng    =new Button("=");
	Button micls     =new Button("C");
	Button misqrt    =new Button("?a·?");
	Button misquare  =new Button("??·?");
	Button mirec  =new Button("μ1êy");
	 
	Button abOK      =new Button("è·?¨");
	
	CardLayout   card  =new CardLayout();
	
	//ó?óú????μ?á?
	String firnum=new String("");//±?D??èéè?a???μ￡?è?1?D′3éString firnum￡?ò???DD3ìDò?±?ó°′μèóú?á3?′í
	String symbol=new String("");
	String tempnum=new String("");//ó?óú?′???3ìùμ?×?·?′?á?
	StringBuffer inputstr=new StringBuffer("");
	double finalanswer;
	double tempanswer;
	boolean symflag=false;
    boolean answerflag=false;
    boolean angflag=true;//ò???èy??ó?óú?D??????μ?ê????è???è?1ê?ìY?è
    boolean radflag=false;
    boolean graflag=false;
    
    double PI=3.141592653589793;
	
	public DefineItems()
	{
		for(int x=0;x<=9;x++) //êμàyêy×??ü,2￠éè??label
		{
			manubu[x]=new Button(String.valueOf(x));
		    minubu[x]=new Button(String.valueOf(x));
		}
		
		for(int y=0;y<=14;y++)//êμày15DD°??ú
		{
			texthelp[y]=new Label();
		}
	}
}


class Calculate extends DefineItems           //????1y3ì
{
	void check(StringBuffer tempstr)
	{
		if(tempstr.toString().length()==1)
   	    {
   	   	    if(tempstr.toString().charAt(0)=='.')
   	   	    {
   	   	    	tempstr.deleteCharAt(0);
   	   	    }
   	    }
   	   
   	    if(tempstr.toString().length()==2)
   	    {
   	   	     if(tempstr.toString().charAt(0)=='0' && tempstr.toString().charAt(1)!='.')
   	   	     {
   	   	    	 tempstr.deleteCharAt(0);
   	   	     }
   	    }
   	   
   	    int sum=0;
   	    int len=tempstr.length();
   	    for(int i=0;i<len;i++)
   	    {
   	   	     if(tempstr.charAt(i)=='.')
   	   	     {
   	   	    	 sum++;
   	   	     }
   	    }
   	    if(sum>1)
   	    {
   	   	     tempstr.deleteCharAt(len-1);
   	    }
	}
	
	void appendinput(String str)
	{
		inputstr.append(str);
	}
	
	void savefirnum()
	{
		firnum=inputstr.toString();
   	    inputstr.delete(0,inputstr.length());
	}
	
	void addsymbol(String str)
	{
		symbol=str;
   	    symflag=true;
	}
	
	void displaynum(String str)
	{
		tefimini.setText(str);
		tefimain.setText(str);
	}
	
	double calculate(String first,String second,String symbol)
	{
		if(symbol.equals("+"))
   	    tempanswer=Double.parseDouble(first)+Double.parseDouble(second);
   	    
   	    if(symbol.equals("-"))	
   	    tempanswer=Double.parseDouble(first)-Double.parseDouble(second);
   	    
   	    if(symbol.equals("*"))	  
   	    tempanswer=Double.parseDouble(first)*Double.parseDouble(second);
   	    
   	    if(symbol.equals("/"))
   	    tempanswer=Double.parseDouble(first)/Double.parseDouble(second);
   	    
   	    return tempanswer;
	}
	
	double square(String str)
	{
		double x=Double.parseDouble(str);
   	    tempanswer=x*x;
   	    return tempanswer;
	}
	
	double sqrt(String str)
	{
		double x=Double.parseDouble(str);
   	    tempanswer=Math.pow(x,0.5);
   	    return tempanswer;
	}
	
	double rec(String str)
	{
		double x=Double.parseDouble(str);
   	    tempanswer=1/x;
   	    return tempanswer;
	}
	
	double sin(String str)
	{
		if(angflag)//?D??ê?è?μ?ê?·????è