Cara mudah Program Operator

Malem guys kali ini saya mau kasih cara mudah gimana cara buat program java Operator, berikut source codenya.

dibawah ini inputnya;


package projectpbo1;
public class Operator {
  public int a,b;
boolean c,d,e;
double f,g;
public void testOperator()
{
a=19;
b=2;
c=true;
d=false;
e=!c;
g=0.2; if
(a%2==1)
b=a++;
else
b=++a;
f=(c&&!d||e)? a/g : a/(g+1);
System.out.println("a : "+a);
System.out.println("b : "+b);
System.out.println("e : "+e);
System.out.println("f : "+f);
}
public static void main(String args[])
{
Operator oper= new Operator();
oper.testOperator();
System.out.println(oper.checkMonth(9, 2014));
}
public int checkMonth(int month,int year)
{
int day=0;
if (month<8)
if(month%2==1)
day=31; else
if(month==2)
day = (year%4==0)? 29: 28;
else
day=30;
else
if(month%2==1)
day=30; else
day=31;
return day;
}
}

maka nanti akan muncul output sbb;