Generic Class in Java

Generic Class

• In this picture as we can see we have three different clots for driver, if you put slotted than you can fix that pin, if you put crossed on driver than you can fix that pin and so on.
• Just like we have generic class which says that you build class one time and that class for all different object like String, Int, Float etc.
• Suppose, we have one list program define for int object but now you are in need of same list for String Object or double Object than every time define same thing for different Object is difficult for us.So what we should do that create generic class.
• Create generic class and use that for different datatypes or Object.How we can implement that is as below.



Generic class

public class Generic<T> { private T[] array; private int size; private int position; //constractor public Generic(int size){ this.size = size; position = 0; array =(T[]) new Object[size]; } public void StoreData(T item){ array[position] = item; position++; } public String GetList() { int i; String list=""; for(i=0;i<=position;i++){ list = array[i]+"__"; } return list; } }


Main class

public class GenericClass { public static void main(String[] args) { // TODO code application logic here Generic<string> glist=new Generic<string>(5); glist.StoreData("Apple"); glist.StoreData("Banana"); glist.StoreData("Mangoes"); System.out.println("\nList of fruits :- "+glist.GetList()); } }