计算器的程序

计算器importjava.awt.*;importjava.awt.event.*;publicclassCountersextendsFrame{Panelpanel;TextFieldtf;Buttonb[],add,sub,mul,div,cle,equ,dot,two,sqr,tsex;BooleanisDot,operated,equaled;doublestoredNumber;charlastOperator;publicCounters(){isDot=false;operated=false;equaled=false;storedNumber=0;