$1.$Write the complete Clock class on your NetBeans $($reference: slide number $32)\mathrm{.}2.$Write the TestClock class $($reference: slide $33),$ find the error on the last lines, and correct it$\mathrm{.}3.$Implement the tick$()$ method in the Clock class$\mathrm{.}4.$Add a test for the tick$()$ method in the TestClock class.