How to find out the class of the object

KnowType.java

class Shape {}
class Circle extends Shape {}
class Square extends Shape {}

class KnowType {
   public static void main(String []args) {
      
      Shape s = new Shape();
      Circle c = new Circle();
      Square sq = new Square();
      
      System.out.println(s.getClass());
      System.out.println(c.getClass());
      System.out.println(sq.getClass());
   }
}

KnowType2.java

class Shape {}
class Circle extends Shape {}
class Square extends Shape {}

class ShapeTest {
	
   public static void main(String []args) {
      Circle obj1 = new Circle();
      Square obj2 = new Square();
		
      if (obj1 instanceof Circle) {
	System.out.println("It's a circle");
      }
      else if(obj1 instanceof Shape) {
	System.out.println("It's a square");
      }	
   }
}