Java Inheritance and composition

Whether to use a combination or a succession, one of the clearest ways to judge it is to ask yourself if you need a new class to move up the base class. If you have to move up, inheritance is a must, and if not, you should consider whether you need to inherit.

Excerpt from <<java programming Ideas >>

Package com.zhyao.extend;

public class Animal {

private String name;

Public Animal (String name) {

THIS.name = name;

}

public void Play (Animal Animal) {

System.out.println (Animal.name);

}

}

Package com.zhyao.extend;

public class Dog extends Animal {

Public Dog (String name) {

Super (name);

}

}

Package com.zhyao.extend;

public class Testmain {

/**

* @param args

*/

public static void Main (string[] args) {

Animal Animal = new Dog ("Small yellow");

Animal.play (animal);

}

}

Java Inheritance and composition