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MySql Use Cases Polymorphism

In Java, polymorphism methods implemented with method overloading, methods with the same name and same number and type of arguments .

A variable can also be polymorphic , ie change its form or class of object reference during the execution of a program. The polymorphism of a variable in Java is limited so that a variable reference to an object can only specialize, just as in real life.

Example polymorphism method sings and the variable foo

class Person {

private String name;

protected String cancion;

public void canta(){System.out.println("la la la");}

} //End Persona

class Ladron extends Persona {

Private int earnings;

sings public void () {System.out.println ("I have not been");}

robs public void (int n) {earnings = earnings + n;}

} / / End Ladron

Judge class extends Person {

Public void sing () {System.out.println (" I am the law");}

} / / End Judge

Poli5 {public class

/ / example of polymorphism sings message

public static void main (String args [])

{

fulanito Person = new Person ();

= new little thief Thief Thief ();

Judge Judge juececito = new ();

fulanito.canta () ; / / sing a person

fulanito = Little thief;

fulanito.canta (); / / sing a thief

fulanito.roba (100);

/ / error compilation: foo is a Person. Solution?

foo = juececito;

fulanito.canta (); / / sing a judge

}

} / / End Poli5

Restriction polymorphism Java syntax: change to subclasses or specialization.

static type Verification: compile time.