What sort of errors might you encounter when trying to open a text file to read formatted data from in Java

Write the definition of a class counter containing: an instance variable named counter of type int. an instance variable named counterid of type int. a static int variable ncounters which is initialized to zero. a constructor that takes an int argument and assigns its value to counter. it also adds one to the static variable ncounters and assigns the result to the instance variable counterid. a method named increment. it does not take parameters or return a value; it just adds one to the instance variable counter. a method named decrement that also doesn't take parameters or return a value; it just subtracts one from the counter. a method named getvalue. it returns the value of the instance variable counter. a method named getcounterid: it returns the value of the instance variable counterid.