java写的计算器

public class Cal { //新建计算器的框架和面版 private Frame f; private Panel pNorth, pCenter, pSouth, pWest, pEast; //定义计算器的按钮名称 private String nameCenter[] = { "1", "2", "3", "4", "5", "6", "7", "8", "9" }; private String nameWest[] = { "+", "-", "*", "/" }; private String nameEast[] = { "CE", "C", ".", "=" }; private String nameSouth[] = { "0" }; private Button btnCenter[] = new Button[nameCenter.length]; private Button btnEast[] = new Button[nameEast.length]; private Button btnWest[] = new Button[nameWest.length]; private Button btnSouth[] = new Button[nameSouth.length];