Copying values from Superclass to Subclass

Question

I have below super class.

SuperOne.java

public class SuperOne{

  private String id;
  private String name;

  //public setter and getter methods


}

SubOne.java

public class SubOne extends SuperOne{

 //To Do : SubOne has no extra fields.

}

I have below method:

public SubOne getData(String id){

      SuperOne data = someDao.getData(String id)

      // Now we have result in data . Now i need to convert data into SubOne and return.

  }

SuperOne.java has no constructor and is provided by third party which i cannot modify.But i can modify SubOne as it is my own. Please suggest me the best way to convert SuperOne into SubOne.

Answer 1

You can use SubOne as a wrapper instead as a child.

class SubOne {

    private SuperOne superOne;

    public SubOne(SuperOne) {
        this.superOne = superOne;
    }

    public String getId() {
        return this.superOne.getId();
    }

    public String getName() {
        return this.superOne.getName();
    }

    public String setId(String id) {
        return this.superOne.setId(id);
    }

    public String setName(String name) {
        return this.superOne.setName(name);
    }

    ///////////////

    public SubOne getData(String id){
        SuperOne data = someDao.getData(String id)
        return new SubOne(data);  
    }

Addendum

If you insist on inherit SuperOne you can do it like this.

class SubOne extends SuperOne {

    public SubOne(SuperOne superOne) {
        super.setId(superOne.getId());
        super.setName(superOne.getName());
    }