如何查看JVM默認的垃圾回收器 java -XX:+PrintCommandLineFlags -version

java -XX:+PrintCommandLineFlags -version

終端環境下，切換到當前程序目錄，輸入上面的參數，回車，輸出如下

-XX:InitialHeapSize=132730432 -XX:MaxHeapSize=2123686912 -XX:+PrintCommandLineFlags -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:-UseLargePagesIndividualAllocat
ion -XX:+UseParallelGC
java version "1.8.0_131"
Java(TM) SE Runtime Environment (build 1.8.0_131-b11)
Java HotSpot(TM) 64-Bit Server VM (build 25.131-b11, mixed mode)