表达式3* 2↑(4+2*2-6*3)-5求值过程中当扫描到6时,对象栈和算符栈为-----,其中↑

public static String execute(String s){ String s2 = ""; try{ Double。parseDouble(s); String s1 = String。valueOf(Double。parseDouble(s)); if(s1。indexOf('。') != -1){ if(s1。substring(s1。indexOf('。'),s1。length()-1)。length()==1){ if(String。valueOf(s1。charAt(s1。indexOf('。')+1))。equals("0")){ s2 = s1。substring(0,s1。indexOf('。')); }else{ s2 = s1; } } s2 = s1; } else{ s2 = s1; } return s2; }catch(Exception e){ e。printStackTrace(); // System。out。println("字符串格式错误"); } return null; }