Learn Java lesson two with eclipse

First section:

• Abnormal:
  • try{ monitored code } catch (Thrown exception type, for example: Exception, IOException, etc.) {};
  • code being detected: if the system throws its own exception, it does not need to throw, if it is the exception of its own definition needs throw exception, catch can catch.
• Custom Exceptions:
  • That is, classes that can define their own exceptions, which must inherit from Java-defined exception classes, such as exception, IOException, and so on, can be defined in a derived class of their own definition.
  Java's exception class has two constructors: (these two constructors do not have to be implemented in the Class!) ）
  • Public batteryusageexception () {}//No parameters
  • Public batteryusageexception (String msg) {super (msg);} String parameter

Using Eclipse to learn Java lesson two