Java exception Mechanism

Java exception Mechanism

1. What is an exception?

Exception: an event that interrupts the normal instruction stream (the issue caused by the program at runtime is irrelevant to the compilation)

2. Exception Classification

These classes are provided by JDK.

Exception is divided into two categories:

Uncheck exception (such as RuntimeException)

Check exception

Thriwable can be divided into two types:

Error)

3. How to Use the try... catch... finally structure

Try {

Code with exceptions

}

Catch (Exception e ){

E. printStackTrace ();

}

Finally {// Execute

System. out. print (1 );

}

Summary:

1. programmers can't do anything about Error. They can only handle Exception.

2. Handling exceptions is related to the robustness of the system.

3. Use try... catch... finally to handle code that may encounter exceptions.