Topic: multi-inheritance design

multi-inheritance design

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Posted By: zhebin_cong
Posted On: Sunday, April 24, 2005 11:32 PM

hello

in a school project,there is a "student" object that has a "score" attribute and some methods,and a "staff" object that has a "salary" attribute and special methods too,the third object is "stu_sta" which is both student and staff.it should have both "score" and "salary" attributes.

i know that java don't support multi-inheritance,it can implement multiple interfaces.but i wonder how to fulfill aforementioned scenario?

how does a child inheritant the attributes of parent INTERFACE??

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Re: multi-inheritance design

Posted By: Anonymous
Posted On: Monday, April 25, 2005 04:30 AM

I would use delegation:


public interface Mother {
    public int doOne();
}
public interface Father {
    public int doTwo();
}
public class MotherImpl implements Mother { ... }
public class FatherImpl implements Father { ... }

public class Son extends MotherImpl implements Father {

    private Father _father = new FatherImpl();

    // doOne() inherited
    
    public int doTwo() {
        return _father.doTwo();
    }
}

For attributes use their getter/setter methods.

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