Note: Lecture 6 Java threads and Java applets

[thinking before class] 1. What is a thread? What is the difference between it and a process? What is the applicable direction? 2. How are Java threads implemented? 3. How are Java threads scheduled? 4. What are the characteristics of multithreading in Java? How are the principles of synchronization and mutual exclusion implemented? 5. What is a java applet and what is the difference between it and application ？ 　　6. How to create a java applet? 　　7. What is the life cycle and main method of applet? 　　8. What is the purpose and usage of applet? 6.1 thread introduction