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1) How to construct a class① "Construct Method", also known as "constructor", when an object is created, its construction method is automatically called. The constructor method is the same as the class name, with no return value.② if the class does not have a constructor defined, theJava compiler automatically gives it a "default constructor" without parameters a

passwordformat.hashed:Oldpwd = _encryptionservice.createpasswordhash (Request. OldPassword, customer. PasswordSalt, _customersettings.hashedpasswordformat);BreakDefaultOldpwd = Request. OldPassword;Break}BOOL Oldpasswordisvalid = Oldpwd = = Customer. Password;if (!oldpasswordisvalid)Result. Adderror (_localizationservice.getresource ("Account.ChangePassword.Errors.OldPasswordDoesntMatch"));if (oldpasswordisvalid)Requestisvalid = true;}ElseRequestisvalid = true;At this point request

1 @Test2 Public voidtest_exception () {3 Try {4 Throw NewEXCEPTIONB ("A");5}Catch(Exceptiona e) {6System.out.println ("Exceptiona");//true7}Catch(Exception e) {8System.out.println ("Exception");//false9}/*catch (Exceptiona e) {Ten System.out.println ("Exceptiona");//Compilation Error One }*/ A}　　Class Exception_a inherits exception, class Exception_b inherits Exception_a, what is