Inheritance of a Variable

[Ravi Pydi]

Iam an amateur to JAVA Programming. Iam working on a task where i should be reading a TEXT file as input and do some validations on the data.
Approach:
I have created a class(Validation.java). I have used DataInputStream to read the data. And the data is stored onto a String variable (say allData) using the readLine() method.
I have declared the varible as an instance variable in the super class.
public allData;
Then i have instantiated the class and the input stream.
Validation val = new Validation();
val.allData = instr.readLine();
//Note:Assuming the input stream is declaread and instantiated.
System.out.println(val.allData);
Iam getting the output that was desired. Now i have done some validations on the data and everything is working fine.
Now i want to use the same variable "allData" in another class.
I have created a subclass and EXTENDED the super class where "allData" variable exists. I have put both the classes into the same PACKAGE.
When i instantiated the subclass (ValidationSub) and printed the "allData" value iam getting null as output. But i want to get the output similar to the output i got in my superclass.
Note: i havent declared any variable in my subclass since it is already declared in the superclass.
How do i get the data assigned to my variable in superclass into my subclass?
I will be glad if anybody could suggest on this.
Thanking you,
Ravi Pydi

[Anthony Villanueva]

Hi friend here's a sample test case:

class Test36
{   
public static void main(String [] args)
{
Data data = new Data();
data.setValue(42);
SubClass sub = new SubClass();
sub.setData(data);
//test
sub.showValue(); 
}
}
class SuperClass
{
private Data myData;
void setData(Data d)
{
myData = d;
}
void showValue()
{
System.out.println("Data is: " + myData.getValue());
}

}
class SubClass extends SuperClass
{
}
class Data
{
private int value;
void setValue(int i)
{
value = i;
}
int getValue()
{
return value;
}
}

How are you doing it?