Difference between system.gc() and runtime.gc()

Question

What is the difference between System.gc() and Runtime.gc()?

Answer 1

System.gc():

1: It is a class method(static method).

2: Non-Native method.(Code which doesn't directly interacts with Hardware and System Resources).

3: System.gc(), Internally calls Runtime.getRuntime().gc().

Runtime.gc():

1: Instance method.

2: Native method(A programming language which directly interacts with Hardware and System Resources.).