InstanceOfPatternMatchingExample.java

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package com.example.demo;

/**
 *
 * @author hantsy
 */
public class InstanceOfPatternMatchingExample {
    public static final void main(String args[]) {
        instanceOfBefore14();
        instanceOf14();     
    }
    
    static void instanceOfBefore14() {
        System.out.println("Before Java 14:");
        Animal animal = new Cat();
        if(animal instanceof Cat){
            Cat cat = (Cat) animal;
            System.out.println("it is a cat:" +cat.name());
        }
    }
    
     static void instanceOf14() {
        System.out.println("In Java 14 or later:");
        Animal animal = new Cat();
        if(animal instanceof Cat cat){
            System.out.println("it is a cat:" +cat.name());
        }
    }
    
}

class Animal{
}
class Cat extends Animal{

    public String name() {
        return "Ketty";
    }
    
    @Override
    public String toString() {
        return "Cat{" + '}';
    }

}
class Dog extends Animal{
    
    public String name() {
        return "Kael";
    }

    @Override
    public String toString() {
        return "Dog{" + '}';
    }  
}