Java: Direct constructor in abstract class

Question

I'm trying to set up an abstract class with 6 variables, and a constructor inside that class, that would populate these fields for every new created object.

What I have now is

public abstract class AbstractUser {

    private String username;
    private String password;
    private String fullName;
    private String email;
    private char sex;
    private Date birthday;

    public AbstractUser(String username, String password, String fullName, String email, char sex, Date birthday){
        this.username = username;
        this.password = password;
        this.fullName = fullName;
        this.email = email;
        this.sex = sex;
        this.birthday = birthday;
    }
}

But I am getting the error "The type AbstractUser is already defined".

I would like that it populates the fields with data set from another concrete class, like

AbstractUser User1 = new AbstractUser("John", "john567", "John Evans", "john@msn.com", "m", 123456789);

Is that even possible with an abstract class?

Answer 1

You can't initialize an abstract class. You need to extend your abstract class.

Answer 2

我们可以在Abstract类中使用构造函数，但是我们不能创建抽象类的对象。