class01 abstract

class01abstract.dart

void main(){
  
  // new OnlyTemplete();  // err -> only class
  
  OnlyTemplete obj1 = Obj1();
  obj1.func();
  obj1.func2();
  obj1.func3();
  // obj1.func4(); // err -> only  obj1
  
  OnlyTemplete obj2 = Obj1();
  obj2.func();
  obj2.func2();
  obj2.func3();
  // obj2.func4(); // err -> only obj1
  // obj2.func5(); // err -> only obj2
  
}

abstract class OnlyTemplete{
  
  void func();
  void func2() => print("temp");
  void func3() => print("temp temp");
}

class Obj1 extends OnlyTemplete{
  void func() => print("obj1");
  @override
  void func3() => print("temp - obj1");
  void func4() => print("only obj4");
}

class Obj2 implements OnlyTemplete{
  void func() => print("obj2");
  @override
  void func2() => print("tmep - obj2");
  @override
  void func3() => print("temp - obj2");
  void func5() => print("only obj2");
}

/// ---------------------------------------------------------------

abstract class OnlyTemplete2{
  void func6();
}

// class Obj3 extends OnlyTemplete OnlyTemplete2 {} // err -> only 1

class Obj3 extends OnlyTemplete implements OnlyTemplete2{
  
  @override
  void func() {}

  @override
  void func6() {}
  
}