import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.Stage;
import javafx.collections.*;
import java.util.*;
import javafx.beans.property.*;
public class JavaFxTest7 extends Application {

    private static class Student {

        private int id;

        private int mark;

        public Student(int id, int mark) {
            this.id = id;
            this.mark = mark;
        }

        public int getId() {
            return id;
        }

        public int getMark() {
            return mark;
        }
    }

    private TableView<Student> table = new TableView<>(FXCollections.observableList(
            List.of(new Student(1, 3), new Student(2, 4), new Student(3, 5))));

    public static void main(String[] args) {
        launch(args);
    }

    @Override
    public void start(Stage primaryStage) {
        var idColumn = new TableColumn<Student, Integer>();
        idColumn.setCellValueFactory((data) -> new ReadOnlyObjectWrapper<>(data.getValue().getId()));
        var markColumn = new TableColumn<Student, Integer>();
        markColumn.setCellValueFactory((data) -> new ReadOnlyObjectWrapper<>(data.getValue().getMark()));
        //markColumn.setMaxWidth(200);//this code works
        //markColumn.setMinWidth(200);//this code works
        markColumn.setStyle("-fx-min-width: 200; -fx-max-width: 200;");//this code doesn't work
        table.getColumns().addAll(idColumn, markColumn);

        VBox root = new VBox(table);
        var scene = new Scene(root, 400, 300);
        primaryStage.setScene(scene);
        primaryStage.show();

    }

}