处理异常的一个类:
package com.mingrisoft; import android.util.Log; import java.math.BigDecimal; import java.util.ArrayList; /** * Created by animator on 2020/1/14. */ public class IsSecondNumZero { public static boolean isAvailable(String str){ ArrayList<Integer> divlist=new ArrayList<Integer>();//储存除号索引 ArrayList<Integer> alllist=new ArrayList<Integer>();//储存所有运算符索引 for(int i=0;i<str.length();i++) { if(str.charAt(i)=='/') { divlist.add(i); alllist.add(i); } else if(str.charAt(i)=='+'||str.charAt(i)=='-'||str.charAt(i)=='*'||str.charAt(i)=='=') { alllist.add(i); } } Log.v("divsize",divlist.size()+""); Log.v("allsize",alllist.size()+""); for(int i=0;i<divlist.size();i++){ String string=str.substring(divlist.get(i)+1,alllist.get(alllist.indexOf(divlist.get(i)) + 1)); BigDecimal num = new BigDecimal(string); if(num.compareTo(new BigDecimal("0"))==0) return true; } return false; } }