java 比较版本号 - 数字版本比较

Posted 2021-05-07

public static int compareDigit(String a,String b){
	    int i = 0 , j= 0 ;
	    while(i < a.length() && j < b.length()){
	        if(a.charAt(i)=='.' && b.charAt(j)=='.') {
	        	i++;j++;continue;
	        }
	        else if(a.charAt(i)=='.')
	            return 1;
	        else if(b.charAt(j)=='.')
	            return -1;
	        else{
	            int a_ = Integer.valueOf(a.charAt(i));
	            int b_ = Integer.valueOf(b.charAt(j));
	            if(a_>b_) return 1;
	            else if(a_ < b_) return -1;
	            else {
	            	i++;j++;
	            }
	        }
	    }
	    if(i==a.length()) return -1;
	    else return 1;
	}