object oriented principles

hi, i'm i need help writing a payroll application using the swing components JOptionPane class. There should be 2 apllications, one to show the results of a partTimeEmployee and another to show the results of a fullTimeEmployee. The first should ask the user to input the employee name, number, pay rate and hours worked. The results should show the employee number, name and weekly pay.

The fullTimeEmployee application should ask for the user to input the employee name, number and annual salery. the results should show the employee number, name gross salery, net annual salery, monthly gross salery, and monly net salery. assume tax in 20% of annual salery and national insurance in 1%.

I have no clue on how to approach this and would love some insight. thanks dudes !!