Jen Baby Java basic Notes inheritance related questions

Inheritance question:
1, create the object must be called the construction method inside the class do you know? Yes
2, the class inside can have multiple construction methods do you know? Yes
3. If there is more than one construction method inside the class, you'll call that. Do you know?
4, what is a subclass do you know?
5, the implementation of the subclass of the construction method must be called before the parent class is not a parameter construction method do you know?
6, how to call the parent class through the subclass of the construction method of a parameter?
Student S1 = new Student (2, "Zhang San");
Student s2 = new Student (2, "Zhang San");
if (S1==S2) {
System.out.println ("is an object");
}

Jen Baby Java basic Notes inheritance related questions