A brief description of runtime anomaly runtimeexception and check anomaly checked Exception

Original connection
1. Check abnormalities such as ioexception,sql anomalies, run-time anomalies such as nullpointerexception;
2. Checked exception must be captured and processed, or thrown; Runtime exception occurs when the JVM throws an exception layer up, and if the program is multiple threads, it is thrown (thread.run) by throw () and ends the process , if it is single-threaded, it is thrown (throw) by Main () and exits the program, the run-time exception can not be caught, and the log processing can be captured;