import?java.awt.*;
import?java.applet.*;

public?class?Calculator?extends?applet{
????TextField?tfAnswer;?//顯示輸入和結(jié)果的文本域
??	Button?bPointbEqualbPlusbMinusbClearbMultibDivision;?//運(yùn)算符按鈕
	Button[]?b=new?Button[10];??//數(shù)字按鈕
??
??	String?currentOppreOp;?//當(dāng)前操作和上一步操作
	String?foreTextbackText;?//當(dāng)前輸入和上一次輸入
??	boolean?isFloat?=?false;?//運(yùn)算類型標(biāo)志
??
??	public?void?init（）?{
	??	Panel?panel1=new?Panel（）;??//實(shí)例化面板
		Panel?panel2=new?Panel（）;
		Panel?panel3=new?Panel（）;
		
	????currentOp?=?new?String（““）;?//實(shí)例化各組件
	????preOp?=?new?String（““）;
	????foreText?=?new?String（““）;
	????backText?=?new?String（““）;
	????tfAnswer?=?new?TextField（8）;
	????setBackground（Color.lightGray）;?//設(shè)置applet背景色
	????setForeground（Color.blue）;???//設(shè)置applet前景色??	????
	????
		for（int?i=9;i>=0;i--）

?屬性????????????大小?????日期????時(shí)間???名稱
-----------?---------??----------?-----??----
?????文件??????217182??2004-05-22?17:11??44-1.bmp
?????文件????????3582??2004-05-20?23:10??Calculator.class
?????文件?????????148??2004-05-22?17:10??Calculator.html
?????文件????????5001??2004-05-22?17:09??Calculator.java