Dart uptodate

Constructor.dart

@@ -0,0 +1,34 @@
+void main() {
+  //static method calling from class itself
+  Student.getResults();
+
+  //named constructor with marksdetails as name
+  Student s = new Student(name: "Atish", roll: 2);
+
+  Student std = new Student.classname([1, 2, 3, 4]);
+  std.showclass();
+}
+
+class Student {
+  //properties
+  late int roll;
+  late String name;
+  late int classid;
+  late bool isMale;
+  List<int> marks = [];
+
+  //constructor
+  Student({this.roll = 1, this.name = "ram"});
+
+  Student.classname(this.marks);
+
+  //methods which denotes the behaviours of the class objects.
+  static void getResults() {
+    print("i am static method");
+  }
+
+  void showclass() {
+    print("This is marks: ${this.marks}");
+    print("This is name: $name and roll.no: $roll");
+  }
+}

calculator.dart

@@ -14,7 +14,7 @@ void main() {
     cal.sub(a: firstNum, b: secondNum);
     cal.mult(a: firstNum, b: secondNum);
     cal.div(a: firstNum, b: secondNum);
-  } on FormatException catch (number) {
+  } on FormatException {
     print("Invlaid number format in input field");
   } catch (error) {
     print(error);