我的主要方法无法在Java的不同包中看到所有公共方法

Question

My main method in a package by itself can only see some of the methods in the other package even though they are all public. This is an example of my code.

    package stuff.code;
    public class AObject
    {
        public AObject();
        public AObject(String str);
        public int getLength();
        public int getHeight();
    }

    package stuff.code;
    public class BObject extends AObject
    {
        public BObject();
        public BObject(String str);
    }

    package stuff.test;
    import stuff.code.AObject;
    import stuff.code.BObject;
    public class tester
    {
        AObject a = new AObject(); //no red underline
        AObject aa = new AObject("some string"); //no red underline
        BObject b = new BObject(); //no red underline
        BObject bb = new BObject("some string"); //tells me there is no such constructor
        b.getLength(); //tells me I need a getLine method in BObject too
    }

I've looked into setAccessible(boolean flag) method but I didn't understand most of it and it was still undefined after I imported java.lang.reflect.AccessibleObject.

This is not my actual code. I wanted this to be vague so that an answer would be more useful to many other people that run into this problem. My methods are all concrete with a body but the body isn't the issue. It runs fine when everything is in the same package but the tester class must be in a different package.

Answer 1

In the second call of BObject constructor, you're passing an argument whereas in it's declaration in the class, it doesn't take any argument. Check that.