Getter 返回旧值

Question

I recently ran into an issue with my object initialization.

I have a class (It is set up this way for persistent data storing and loading)

public class Example extends SuperExample{
    private String name = "";
    public Example(){
        super();
    }

    public String getName(){
        return name;
    }

    @Override
    protected void load(){
        name = "Example";
    }
}

public abstract class SuperExample{
    protected abstract void load();
    public SuperExample(){
        //Do stuff
        load();
    }
}

The getName() that is called after the object is initialized is returning "" and not "Example" .

Any idea what the root cause of this could be? If I were to set name in the constructor it works fine. But when it goes through the super , it errors.

Example e = new Example();
System.out.println(e.getName());

Answer 1

The initializer code: private String name = ""; runs AFTER the parent constructor. Remove the initialization and it will work correctly. But you shouldn't call overridable methods from constructors. :)

private String name;

instead of

private String name="";

Answer 2

It's because the Example class method is protected I think. It's not callable from outside the class, so you're calling the superclass method. That does nothing so the value is still "" . To check this, add a print statement to the load method and see if it's being called.