What does the JVM do when a runtime error occurs? How do you catch a runtime error?

Suppose methodY (double d) causes an exception in the following try- catch block: public void methodQ4 () throws Exception { try { } methodY (0.5); catch (Exception ex) { } System.out.println(ex); throw ex; finally { } System.out.println("Finally block executed"); System.out.println("Program continue"); }