How to make a boolean variable switch between true and false every time a method is invoked?

Question

I am trying to write a method that when invoked, changes a boolean variable to true, and when invoked again, changes the same variable to false, etc.

For example: ca

Answer 1

in java when you set a value to variable, it return new value. So

private boolean getValue()
{
     return value = !value;
}