java - Why won't the value of my int change? -

hi i'm new java , working on code works calendar. thought had completed days seem remain 31 rather changing based on if/else statement. here code:

public int maxdaysinmonth( int year, int month ) {  boolean = (year % 4 == 0) || ((year%4==0) && (year % 100 != 0));  int days = 0; int imonth = 0;   if( imonth == 4 || imonth == 6 || imonth == 9 || imonth == 11) {     days = 30; }  else if ( imonth == 1 || imonth == 3 || imonth == 5 || imonth == 7 || imonth == 8 || imonth == 10 || imonth == 12) {     days = 31; }  if (a == true && imonth == 2) {      days = 29;  } else if (a == false && imonth == 2) {     days = 28; }  return days;  } 

any appreciated!

what's purpose of imonth? initialize 0 test if represented month.

you don't need imonth; use month in if tests.

also, leap year determination isn't quite correct. it's leap year if year number divisible 400. try

boolean = (year % 400 == 0) || ((year % 4 == 0) && (year % 100 != 0)); 

you might want more descriptive variable name, such isaleapyear.