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

Question

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

Answer 1

Both are same System.gc() is effectively equivalent to Runtime.gc()

System.gc() internally calls Runtime.gc().

The only difference is :

System.gc() is a class (static) method where as Runtime.gc() is an instance method. So, System.gc() is more convenient.

System.gc()

public final class System extends Object{

    public static void gc(){
        .
        .
         Runtime.getRuntime().gc();
    
    }
    .
    .

}

Runtime.gc()

public class Runtime extends Object{

    public void gc(){

        // ...

    }
    .
    .
    .

}