java - Creating clock format from int -

i have been searching, seems convoluted. accustomed splicing in python, java noob.

i input 4 digits long, , have restrict digits can displayed clock later. using military time. trying convert string sub string of wanted , convert int, getting in-convertible types error.

    string digits = integer.tostring(clockval);      if (integer.parseint(digits.charat(0) > 1 ) { // cuz 1st dig can 1 or 0 

any appreciated. ps cannot change input int, either.

say have 4 digit int has 24 hour time between 0000 , 2359

public static boolean isvalid(int time) {      int mins = time % 100;      return mins < 60 && hrs >= 0 && hrs < 2400; } 

say between 0001 , 2400

public static boolean isvalid(int time) {      int mins = time % 100;      return mins < 60 && time >= 1 && time <= 2400; }