Get a class of an object : InputStreamReader « File « Java Tutorial

1. Java Tutorial
2. File
3. InputStreamReader

import java.util.ArrayList;
import java.util.List;

public class Main {
  public static void main(String[] args) {
    Person p = new Person("A");
    Animal a = new Animal("B");
    Thing t = new Thing("C");
    String text = "hello";
    Integer number = 1000;

    List<Object> list = new ArrayList<Object>();
    list.add(p);
    list.add(a);
    list.add(t);
    list.add(text);
    list.add(number);

    for (int i = 0; i < list.size(); i++) {
      Object o = list.get(i);
      if (o instanceof Person) {
        System.out.println("My name is " + ((Person) o).getName());
      } else if (o instanceof Animal) {
        System.out.println("I live in " + ((Animal) o).getHabitat());
      } else if (o instanceof Thing) {
        System.out.println("My color is " + ((Thing) o).getColor());
      } else if (o instanceof String) {
        System.out.println("My text is " + o.toString());
      } else if (o instanceof Integer) {
        System.out.println("My value is " + ((Integer) o));
      }
    }
  }
}

class Person {
  private String name;

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

  public String getName() {
    return name;
  }
}

class Animal {
  private String habitat;

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

  public String getHabitat() {
    return habitat;
  }
}

class Thing {
  private String color;

  public Thing(String color) {
    this.color = color;
  }

  public String getColor() {
    return color;
  }
}