The problem
You are to develop a program, which can find the price for a stamp for a letter depending on the letters weight.
The table below shows the relation between letters weight and stamp price

4.25 DKK

			Letter			Stamp price
	0 g	<	weight	<=	50 g	4.50 DKK
	50 g	<	weight	<=	100 g	6.50 DKK
	100 g	<	weight	<=	250 g	12.50 DKK
	250 g	<	weight	<=	500 g	21.00 DKK
	500 g	<	weight	<=	1000 g	29.00 DKK
	1000 g	<	weight			42.00 DKK

The solution
Create a project "Stamp" and mount a folder for the files.
Create a new "Java class" and give it the name StampCalculator

Declare a method in StampCalculator using the template below:

public double getPrice(int weight) {
        .....
}

Construct the code so it returns the price relevant for the given weight - you'll need a lot of nested if-else statements!
Compile it.

Testing the calculator
Now add a new "JFrame Form" for testing the StampCalculator - give it the name StampTestForm

Place a JPanel on the form, choose AbsoluteLayout and add a label and a text-field for entering the weight value, a label for showing the output (the price of the stamp) and a button to activate the action.
Your form should look something like:

Add a reference to an object of the StampCalculator type in the form (at the bottom of the file as usual.

Now add code to the button so a click will read the value from the text-field, typecast it to numerical (use Integer.parseInt()) and activates the getPrice() method in the StampCalculator object using the value as argument. The return value from this method should be put into the output-label. Below is an example of this:

Adapting the StampCalculator
In your study-group discuss the following:

• what would be the difference if the method getPrice() was static?
• should it be static?
• what do you need to change in StampTestForm if the method was static?

Change the method getPrice() into static and do the necessary changes in StampTestForm