checking validity of the date

//using bluej

class Valid_Date

{

public static void main(int dd,int mm,int yy)

{

int k=0,e=0;

int m[]={30,28,31,30,31,30,31,31,30,31,30,31};

k=(yy%400==0)?yy%100==0?1:0:yy%4==0?1:0;

m[k]=m[k]+k;

if(mm<1 || mm>12)

{

e=1;

System.out.println(mm+"is invalid month");

}

if(dd<0 || dd>m[mm-1])

{

e=1;

System.out.println(dd+" is invalid date");

}

if(yy<1)

{

e=1;

System.out.println(yy+" is invalid year");

}

if(e==0)

System.out.println(dd+"-"+mm+"-"+yy+" is valid date");

}

}