Learning generics

Get Started
1

I am learning generics but can´t seem to understand very well how to use them what I am trying to do is create a method that divides 2 numbers, can someone give me a short but easy to understand explanation so I can better understand it.

2

I was able to do this with strings like this:


package aa4pedtlacaelel;
public class UsoGenericos <T, U>{
    private T nombre;
    private U apellido;
    public void nombreCompleto (T nombre, U apellido){
        this.nombre = nombre;
        this.apellido = apellido;
        System.out.println("Mi nombre es: " + nombre + " " + apellido);
    }
}

However I still don´t really get why do it this way

3

So, I created a class that does divide the 2 numbers properly and was able to call it from a class within the same package successfully.


package aa4pedtlacaelel;
public class UsoGenericos {
    public double divide (double divisor, double dividendo){
      double resultado = dividendo / divisor;
      return resultado;
    }
}

and was trying to convert this to use generic types and I got this far


package aa4pedtlacaelel;
public class UsoGenericos <T, U, S>{
    private T dividendo;
    private U divisor;
    public double divide (T dividendo, U divisor){
        this.dividendo = dividendo;
        this.divisor = divisor;
        return dividendo / divisor;
    }
}

but can´t seem to get pass the return value, is it possible to do what I am trying to? or generic types are meant for something other than this

4

[code=java]
public class UsoGenericos
{
private double nombre;
private double apellido;

public double nombreCompleto(double nombre, double apellido)
{
    return nombre / apellido;
}

public static void main(String[] args) 
{
    UsoGenericos uso = new UsoGenericos();

    System.out.println(uso.nombreCompleto(5,2/1));
}

}

5

well, thank you for your reply, however my point was on using generic types