how to write a code for matlab designer in matlab

main.m
classdef MyFirstApp < matlab.apps.AppBase
    % Properties that correspond to app components
    properties (Access = public)
        UIFigure matlab.ui.Figure
        Button matlab.ui.control.Button
        Label matlab.ui.control.Label
    end

    % Callbacks that handle component events
    methods (Access = private)
        % Button pushed function
        function ButtonPushed(app, event)
            app.Label.Text = 'Hello, World!';
        end
    end

    % App initialization and construction
    methods (Access = private)
        % Create UIFigure and components
        function createComponents(app)
            % Create UIFigure
            app.UIFigure = uifigure;
            app.UIFigure.Position = [100 100 300 200];
            app.UIFigure.Name = 'My First App';

            % Create Button
            app.Button = uibutton(app.UIFigure, 'push');
            app.Button.Position = [100 100 100 22];
            app.Button.Text = 'Click Me!';
            app.Button.ButtonPushedFcn = createCallbackFcn(app, @ButtonPushed);
            
            % Create Label
            app.Label = uilabel(app.UIFigure);
            app.Label.Position = [100 150 100 22];
            app.Label.Text = 'Hello,';
        end
    end

    % App creation and deletion
    methods (Access = public)
        % Construct app
        function app = MyFirstApp
            % Create and configure components
            createComponents(app);

            % Register the app with App Designer
            registerApp(app, app.UIFigure);
            
            % Run the startup function
            runStartupFcn(app, @runStartupCode);
        end

        % Code that executes before app deletion
        function delete(app)

            % Delete UIFigure when app is deleted
            delete(app.UIFigure);
        end
    end
    
    methods (Access = private)
        % Startup code
        function runStartupCode(app)
            % Add any necessary startup code here
        end
    end
end
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