Multithreading, synchronization methods and realize the difference between Error and Exception with contact

Multithreading, synchronization implementation?

1. There are two ways to achieve thread:
   • Thread class inheritance
   • Implement Runnable
2. There are two ways to achieve synchronization
   • One is a method of synchronization: synchronizing method is to add the method returns back type synchronized, for example: public void synchronized methodName () {...}
   • One is to use sync block: sync block is written directly: the synchronized (written here in a subject in need synchronization) {...}

Error and exception differences and relations

• Restoration of error that is not impossible, but a serious problem under very difficult circumstances. For example, out of memory, network failure. We can not count on the program can handle the situation.
• exception that a design or implementation issues. In other words, it means that if run properly, would not have happened. Program can capture these exceptions, and processing.