Difficulties to understand radio buttons logic

I am having s开发者_运维问答ome difficulties while trying to understand the radio buttons logic.

I have two radio buttons and their name is FR.

From the database, I am retrieving a value which is "F" or "R".

I would like to do that If the value = F then the radio button which is Freeze to be checked else the other radio button to be chekced.

I tried to use

if FV_Value.equals("F") then I stopped where I do not know exactly how to deal with them.

Can you please help? and give me an example

You should print the checked attribute whenever the button's value matches the model value.

<input type="radio" name="fr" value="F" ${model.fv == 'F' ? 'checked' : ''}>
<input type="radio" name="fr" value="R" ${model.fv == 'R' ? 'checked' : ''}>