instanceof

Java

by techbard 2016. 7. 13. 19:02

# Animal.java

public class Animal {

private String name;

public Animal(String name) {
this.name = name;
}

public String getName() {
return name;
}

public String say() {
return "unknown";
}
}

# Dog.java

public class Dog extends Animal {

public Dog(String name) {
super(name);
}

@Override
public String say() {
return "waf! waf!";
}
}

# Main.java

public class Main {

public static void main(String[] args) {

Animal dog = new Dog("fido");
showAnimalType(dog);
}

private static void showAnimalType(Animal a) {

Class theClass = a.getClass();
String className = theClass.getSimpleName();
Class parentClass = theClass.getSuperclass();
String parentClassName = parentClass.getSimpleName();

System.out.println("Class name is " + className);
System.out.println("Parent class name is " + parentClassName);

if (a instanceof Animal) {
System.out.println("It's an Animal");
}

if (a instanceof Dog) {
System.out.println("It's a Dog");
}

System.out.println("This animal says: " + a.say());
}
}