Trouble creating Java helper classes

[nims0c]

I have a set of 10 methods that will be shared across 4 classes, although with different implementations in each. I also want several subclasses of each of these 4 classes so that I can implement an additional method unique to each subclass.

 

My idea was to create an interface with the 10 shared methods. Then 4 abstract base classes that would fully implement the interface in their own unique way, along with an abstract method to be implemented in each subclass.

 

The problem is that I would like all of the methods to be called by subclass name, requiring static method declarations. But I am constrained to Java 7, so no static or default interface methods.

 

I would appreciate any help as I am new to Java and programming in general.

[Gabriel]

Depends what you want to do, but you can use the Singleton design pattern approach. 

Basically you can create 1 class lets call it "Constants" here you will create static declarations to all your Classes something like this

 

 

public static MyClass1 myclassname = new MyClass1();

public static MyClass2 xxxx2 = new MyClass2();

public static MyClass3 somethingsomething = new MyClass3();

public static MyClass4 class4 = new MyClass4();

 

 

 

 

now they're stored in your "Constants" class if you want to access any methods that these classes holds you can reference them back like this

 

 

 

Constants.class4.method22();

 

 

 

method22 is not static