problem with constructor

[jinnejeevansai]

I was not understanding what is going on the output of below code is 0 0.But i was expecting it to be 45 12.Can someone explain the reason for such output.

import java.util.*;
import java.io.*;
import java.lang.*;
class person{
static int pn,py;
}
class patient extends person{
public patient()
{
pn=45;
py=12;
}
static void fun()
{
System.out.println(""+pn+py);
}
public static void main(String args[])
{
fun();
}
}

[Mator]

You first have to instantiate your patient class
The assignment is made in the constructor of the patient class is it not?

import java.util.*;
import java.io.*;
import java.lang.*;

class person{
    static int pn;
    static int py;
}

class patient extends person{
public patient(){
    person.pn = 45;
    person.py = 12;
}//end of patient constructor

static void fun(){
    System.out.println("" + person.pn + patient.py);
}//end of fun()

public static void main(String args[]){
    patient pat = new patient();
    fun();
}
}//end of patient class

You also don't need to import java.lang (always implicitly imported by the JVM)

[jinnejeevansai]

could you explain what you said

[Mator]

I have added code samples to make it clearer.