Java Program To Create Multiple Class

class firstClass {
    
   firstClass() {
      System.out.println("Constructor of first class.");
   }
   
   void firstClassMethod() {
      System.out.println("Method of first class.");
   }
   
   public static void main(String[] args) {
      firstClass firstClassObject = new firstClass();
      secondClass secondClassObject = new secondClass();
      firstClassObject.firstClassMethod();
      secondClassObject.secondClassMethod();
   }
   
}

class secondClass {
   secondClass() {
      System.out.println("Constructor of second class.");
   }
   void secondClassMethod() {
      System.out.println("Method of second class.");
   }
}

Constructor of first class.
Constructor of second class.
Method of first class.
Method of second class.