Good way to implement a child class

Question

So I have about 10-15 classes (this could grow to a much larger number in time) and they all have fairly similar variables within them:

temp
conditions
humidity
load

..And stuff like that. I'm looking to implement a parent class (abstract) to better manage this since they are all runnable.

There's a part where I call a constructor for each of them and it's... just bad.

 public ThreadHandler(NH.NHandler NSH, int threadNum){
    this.threadNum=threadNum;
    this.NSH = NSH;
}

public ThreadHandler(OPA.OpaHandler SgeSH, int threadNum){
    this.threadNum=threadNum;
    this.OpaSH = OpaSH;
}

public ThreadHandler(SGE.SgeHandler SgeSH, int threadNum){
    this.threadNum=threadNum;
    this.SgeSH = SgeSH;
}

..... and on for 15

How would I implement a parent class to simply do

public ThreadHandler(objectType name, int threadNum){
    //Do stuff
}

Thanks for any help.

Answer 1

You need to create an interface, say, IHandler with common methods and all handlers should implement this interface

public interface IHandler {
      .... declare public methods 
    } 

public NHandler implements IHandler  {
       .... implement all the methods declared in IHandler..
    }

Now you can just have the following in ThreadHandler

 public ThreadHandler(IHandler handler, int threadNum){ .... call the methods } 

Answer 2

I have another example using abstract class and extends that to ChildClass . I hope will help your problem.

ParentHandler.java

public abstract ParentHandler<T> {

    public T obj;
    public int threadNum;
    // Declare the common variable here...

    public ParentHandler(T obj, int threadNum) {
        this.threadNum = threadNum;
        this.obj = obj;
    }
}

ChildHandler.java

public class ChildHandler extends ParentHandler<NH.NHandler> {

    public ChildHandler(NH.NHandler nsh, int threadNum) {

        super(nsh, threadNum);
    }
}

Answer 3

Implement an interface, every "child" class will implement it, then you can declare an object of the interface type and create a method that returns the especific class based on something, like this.

    public Interface ITest
    {
        string temp;
        void Test(string param1, string param2);
    }

    public Class Class1 : ITest
    {
        void Test(string param1, string param2)
        {
            // DO STUFF
        }
    }

    public Class Class2 : ITest
    {
        void Test(string param1, string param2)
        {
            // DO STUFF
        }
    }

And then:

    public ITest GetClass(string type)
    {
         switch (type)
         {
             case "class1":     
                   return new Class1();
             case "class2":     
                   return new Class2();
         }  
    }

And you call it like

    ITest obj = GetClass("class1");
    obj.Test();