Generic constructors and methods in non-generic class

It is possible for constructors / methods to be generic, even if their class is not.

---

// Generic programming

// Generic constructors in non generic class

class Gen

{

     double x;

     <T1 extends Number>Gen(T1 v)

     {

          x = v.doubleValue();

     }

     public void fnDisplay()

     {

          System.out.println(“x = “+x);

     }

}

class GenPgm5

{

     public static void main(String as[])

     {

          Gen g1 = new Gen(5);

          g1.fnDisplay();

          Gen g2 = new Gen(4.5);

          g2.fnDisplay();

     }

}

---

// Generic programming

// Generic methods in non generic class

class Gen

{

     public <T1 extends Number> void fnSum(T1 x, T1 y)

     {

          double sum = x.doubleValue() + y.doubleValue();

          System.out.println(“Sum = “+sum);

     }

}

class GenPgm6

{

     public static void main(String as[])

     {

          Gen g1 = new Gen();

          g1.fnSum(5,6);

          Gen g2 = new Gen();

          g2.fnSum(4.5, 5.2);

     }

}