private static int stringToInt(String nums){
if(null == nums || nums.length()<2){
if(nums.length()==1 && (nums.codePointAt(0)>=48 && nums.codePointAt(0)<=57)){
return Integer.parseInt(nums);
}
return 0;
}
char start = nums.charAt(0);
Integer startNum = nums.codePointAt(0);
if(start=='+' || start == '-' || (startNum >= 48 && startNum <= 57)){
int before = 1;
int index = 0;
if(start == '-' || start == '+'){
if (nums.length()<2){
return 0;
}
if(start == '-'){
before = -1;
}
index = 1;
}
return before*processNums(nums,index);
}
return 0;
}
private static int processNums(String nums,int start){
double result = 0;
for (int i = start; i < nums.length(); i++) {
if(!(nums.codePointAt(i)>=48 && nums.codePointAt(i)<=57)){
return 0;
}
int now = Integer.parseInt(nums.substring(i,i+1));
result = 10 * result +now;
}
return (int)result;
}
考虑多种异常情况，最总转化成一个处理正数的方法中
