Default garbage collector for Java 8

Question

What is the default garbage collector for Java 8?

When I check the JMX Beans, they reveal it to be the parallel collector for the new generation and the old serial c

Answer 1

Java has four types of garbage collectors(Up to version 10),but after stable release of java 11 , it would be 5 types. These are:-

1. Serial Garbage Collector- S GC
2. Parallel Garbage Collector- P GC
3. CMS Garbage Collector- CMS GC
4. G1 Garbage Collector- G1 GC
5. The Z Garbage Collector- ZGC

Default implementations of GC in java -

JVM GC

 Java 7 - P GC       
 Java 8 - P GC
 Java 9 - G1 GC
 Java 10- G1 GC
 Java 11- Z GC(I am not sure but it would be default GC of java 11)

More details for ZGC,please visit

http://openjdk.java.net/projects/zgc/

https://www.opsian.com/blog/javas-new-zgc-is-very-exciting/

Note: If you want to verify, which GC is currently being used by JVM,you can go for following command to show default GC:-

$ java -XX:+PrintCommandLineFlags -version 

If you want to set GC according to your need, you can do this by following command. Here I am going to set G1 GC as default GC.

$ java -XX:+UseG1GC -XX:+PrintCommandLineFlags -version 

For more details , please visit 

https://javapapers.com/java/types-of-java-garbage-collectors/

https://alvinalexander.com/java/java-jvm-how-show-which-garbage-collector-running