How to handle exeception throw from a method from anohter? {Continues...}

Question

in class A, i have a caller method P1 that called methods P2, P3 of the same class.
P2 throw two exeptions and P3 throw another exception
P1 is called by anohte method of another class. However, in P1, how should i handle the exception returned by P2, and P3?