You are almost there:

According to your requirements, in your constructor, you also need to pass a boolean variable; so, your constructor looks something like this:

public TFQuestion(String...

You need this:

public class DemoAges
{
private Ages ages = new Ages();

public static void main(String[] args)
{
//Declare/initialize Ages
int age = 0;

- Open a command prompt
- Type in: date
- it prompts you for new date/time
- enter new values.

You cannot compare string with number, the way you are doing it. however you can compare strings with equals() or equalsIgnoreCase() methods of String.

What is it that you try to compare, e.g. 0...

Do you ever call the calculateAre of Triangle and Rectangle? you should call calculateArea to actually calculate and assing new value to area e.g.

class TwoDShapeDriver
{
public static void...

In your calculateArea don't use a local instance, and set your class variable "area" to the newly calculated value like:

area = getHight() * getWidth...

In your caculateArea() you should use the getter method of your TwoDShape class to obtain the hight and width and not directly since they are private to TwoDShape. You can do something like this:
...

Or for 2nd one, add the following right after your for() loop:

for (j=0;j <triangleSize;j++ ) {
for(k=triangleSize-1;k>j;k--){
System.out.print('*');
}
...