Why.java

package com.why;

public class Why {

    public static void main(String[] args) {
        Gen<A> gen = new Gen<>();
        gen.m(new A()); //eeeeeeeeee A
    }
}

class A {}

class B extends A {}

class C extends A {}

class Gen<E> {
    Test test = new Test();

    public void m(E e) {
        test.test(e);
    }
}

class Test {

    public <E extends A> void test(E e) {
        System.out.println("XXXXXXXXXX " + e.getClass().getSimpleName());
    }

    public <E> void test(E e) {
        System.out.println("eeeeeeeeee " + e.getClass().getSimpleName());
    }
    
}