Summary of JVM interview focus (II) -- garbage collector (GC) and memory allocation strategy

1. How to judge that the object has died ？ It can be used as “GC Root” What are the of the object ？ How can we judge the true death ？

2. Brief description strong 、 soft 、 weak 、 Virtual reference ？

3. There are several garbage collection algorithms ？ This paper briefly introduces the generational collection theory and three hypotheses of generational collection ？

4. Mark — Characteristics and process of clearing algorithm ？ shortcoming ？

5. Mark — Characteristics and process of replication algorithm ？ Defects and improvements ？

6. Mark — Sorting out the characteristics and process of the algorithm ？ The difference between clearing algorithm and sorting algorithm ？CMS When to use the collation algorithm ？

7. What are the garbage collectors ？

8. sketch serial The collector ？ What is single threaded work ？

9. sketch PerNew The collector ？ The difference between concurrency and parallelism ？

10. sketch Perallel Scavenge The collector ？ God horse is a high throughput ？

11. sketch Serial Old The collector ？Parallel Old The collector ？

12. sketch CMS The collector , pros and cons ？

13. say something Garbage first The collector ？ What is thought ？ The process ？

14.G1 And CMS Comparison .

15. Memory allocation and recycling strategy . When does the subject enter the old age ？

16.Minor GC,Major GC,Full GC.

17. Dynamic object age determination .