Java Exception

0. 什么时候用catch，什么时候用throws

http://stackoverflow.com/questions/11853348/throwing-and-catching-exceptions

Throwing and Catching Exceptions

http://www.onjava.com/pub/a/onjava/2003/11/19/exceptions.html

Best Practices for Exception Handling

1. print exception

Printing Exception Message in java http://stackoverflow.com/questions/15722763/printing-exception-message-in-java

try {
 // ----
} catch (javax.script.ScriptException ex) {
 System.out.println(ex.getMessage());
}

2. print stack trace

http://stackoverflow.com/questions/2560368/what-is-the-use-of-printstacktrace-method-in-java

   catch(IOException ioe)
    {
        ioe.printStackTrace();
    }

 no error trace

for (StackTraceElement ste : Thread.currentThread().getStackTrace()) {
    System.out.println(ste);
}

http://stackoverflow.com/questions/1069066/get-current-stack-trace-in-java Get current stack trace in Java

http://stackoverflow.com/questions/1149703/stacktrace-to-string-in-java Stacktrace to string in Java