java等级计算javafx

Question

在我的课程中有两门课，一门是学生财产课，另一门是主课问题是我得到了我想要的布局，但单击按钮并不能得到所需的结果

这是第一类students。我在这篇文章的底部贴了一张输出图片，请查收

package task2;

 public class Student {
// student propeties
private final String name;
private final double id;
private final double quiz;
private final double a1;
private final double a2;
private final double exam;
private final double result;
private final String grade;

//parameterized constructor of the student
public Student(String name, double id, double quiz, double a1, double   

a2, double exam, double result, String grade) {    
    this.name = name;
    this.id = id;
    this.quiz = quiz;
    this.a1 = a1;
    this.a2 = a2;
    this.exam = exam;
    this.result = result;
    this.grade = grade;
}

/*
* getter and setter metod for all the properties
* of students
*/ 

 public String getName() {
    return name;
}
public void setName(String studentName) {
    studentName = this.name;
}

public double getId() {
    return id;
}
public void setId(double studentId) {
    studentId = this.id;
}

public double getQuiz() {
    return quiz;
}
public void setQuiz(double quizMarks) {
    quizMarks = this.quiz;
}

public double getA1() {
    return a1;
}

public void setA1(double assignmentOneMarks) {
    assignmentOneMarks = this.a1;
}

public double getA2() {
    return a2;
}
public void setA2(double assignmentTwoMarks) {
    assignmentTwoMarks = this.a2;
}

public double getExam() {
    return exam;
}
public void setExam(double exam) {
    exam = this.exam;
}

public double getResult(){
    return result;
}

public void setResult(double result){
    result = this.result;
}

public String getGrade(){
    return grade;
}

public void setGrade(String grade){
    grade = this.grade;
  }

}

第二个是Task2，它包含main方法，其中所有计算部分都在进行：

package task2;

import java.util.ArrayList;
import java.util.List;
import javafx.scene.control.TextField;
import javafx.application.Application;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.event.ActionEvent;
import javafx.geometry.Insets;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TableColumn;
import javafx.scene.control.TableView;
import javafx.scene.control.cell.PropertyValueFactory;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.scene.text.Text;
import javafx.stage.Stage;

public class Task2 extends Application {

//Create table view
private final TableView<Student> table = new TableView<>();
//Collection to display data in table
private final ObservableList<Student> data =  

FXCollections.observableArrayList();

@Override
public void start(Stage primaryStage) {
    // border pane layout
    BorderPane borderPane = new BorderPane();

    //creating label student name 
    Text studentNameLabel = new Text("Student Name");
    // student inout field
    TextField studentName = new TextField();

    //creating student id label 
    Text studentIdLabel = new Text("Student ID");
    //id input field
    TextField studentId = new TextField();

    //creating label quiz marks
    Text quizMarksLabel = new Text("Quiz Marks");
    //quiz mark input field
    TextField quizMarks = new TextField();

    //creating label assignment1 marks
    Text assignmentOneMarksLabel = new Text("1st Assignment Marks");
    //assignment one mark input field
    TextField assignmentOneMarks = new TextField();

    //creating label assignment2 marks
    Text assignmentTwoMarksLabel = new Text("2nd Assignment Marks");
    //assignment two mark input field
    TextField assignmentTwoMarks = new TextField();

    //creating label assignment2 marks
    Text examMarksLabel = new Text("Main Exam Marks");
    //input for exammarks label
    TextField examMarks = new TextField();

    //Gridpane layout
    GridPane gridPane = new GridPane();

    //gridPane.setMinSize(600, 400); 
    gridPane.setPadding(new Insets(20, 20, 20, 20));
    //set vertical and horizontal gap for gridpane
    gridPane.setVgap(07);
    gridPane.setHgap(70);

    //adding labels in the grid 
    gridPane.add(studentIdLabel, 0, 0);
    gridPane.add(studentNameLabel, 0, 1);
    gridPane.add(quizMarksLabel, 0, 2);
    gridPane.add(assignmentOneMarksLabel, 0, 3);
    gridPane.add(assignmentTwoMarksLabel, 0, 4);
    gridPane.add(examMarksLabel, 0, 5);

    //adding text fields in the grid
    gridPane.add(studentId, 1, 0);
    gridPane.add(studentName, 1, 1);
    gridPane.add(quizMarks, 1, 2);
    gridPane.add(assignmentOneMarks, 1, 3);
    gridPane.add(assignmentTwoMarks, 1, 4);
    gridPane.add(examMarks, 1, 5);

    table.setEditable(true);
    borderPane.setTop(gridPane);
    Scene scene = new Scene(borderPane);

    //assigning data in the cell of table
    TableColumn name = new TableColumn("Name");
    name.setCellValueFactory(new PropertyValueFactory<>("name"));

    TableColumn id = new TableColumn("Id");
    id.setCellValueFactory(new PropertyValueFactory<>("id"));

    TableColumn quiz = new TableColumn("Quiz");
    quiz.setCellValueFactory(new PropertyValueFactory<>("quiz"));

    TableColumn a1 = new TableColumn("A1");
    a1.setCellValueFactory(new PropertyValueFactory<>("a1"));

    TableColumn a2 = new TableColumn("A2");
    a2.setCellValueFactory(new PropertyValueFactory<>("a2"));

    TableColumn exam = new TableColumn("Exam");
    exam.setCellValueFactory(new PropertyValueFactory<>("exam"));

    TableColumn result = new TableColumn("Results");
    //calculating the result of the student..
    result.setCellValueFactory(new PropertyValueFactory<>("result"));

    TableColumn Grade = new TableColumn("Grade");

    Grade.setCellValueFactory(new PropertyValueFactory<Student, String> 

   ("grade"));

    table.setItems(data);
    //adding all the data in the cell of the table
    table.getColumns().addAll(name, id, quiz, a1, a2, exam, result,  

     Grade);

    //creating horizontal box for the display of lower fields
    HBox box = new HBox();
    box.setPadding(new Insets(10, 10, 10, 10));
    Label label = new Label("Average marks :");
    box.getChildren().add(label);
    TextField averageMarksLabel = new TextField();
    averageMarksLabel.setEditable(false);
    box.getChildren().add(averageMarksLabel);
    Button btnAverageMarks = new Button("Average Marks");

    box.getChildren().add(btnAverageMarks);
    Button btnAddNewStudent = new Button("Add new student");
    btnAddNewStudent.setDisable(false);
    box.getChildren().add(btnAddNewStudent);
    Button btnStudentMarks = new Button("Student Marks");
    box.getChildren().add(btnStudentMarks);

    borderPane.setCenter(table);
    borderPane.setBottom(box);

    // Setting title to the Stage   
    primaryStage.setTitle("Grade Processing - Programming in Java 2");

    btnStudentMarks.setOnAction((ActionEvent e) -> {
        double resultsMarks = (Double.parseDouble(quizMarks.getText()) 

             * (double) 0.05)
                + (Double.parseDouble(assignmentOneMarks.getText()) * 

      (double) 0.20)
                + (Double.parseDouble(assignmentTwoMarks.getText()) * 

        (double) 0.25)
                + (Double.parseDouble(examMarks.getText()) * (double) 

           0.5);

        //checking the conditon for the grade of the student.
        String grade = "";
        if (resultsMarks >= 85 && resultsMarks < 100) {
            grade = "HD";
        } else if (resultsMarks >= 75 && resultsMarks < 85) {
            grade = "DI";
        } else if (resultsMarks >= 65 && resultsMarks < 75) {
            grade = "CR";
        } else if (resultsMarks >= 50 && resultsMarks < 65) {
            grade = "PS";
        } else if (resultsMarks > 50) {
            grade = "Fail";
        }
        data.add(new Student(
                studentName.getText(),
                Integer.parseInt(studentId.getText()),
                Double.parseDouble(quizMarks.getText()),
                Double.parseDouble(assignmentOneMarks.getText()),
                Double.parseDouble(assignmentTwoMarks.getText()),
                Double.parseDouble(examMarks.getText()),
                resultsMarks,
                "HD"
        ));
        //clearing the text field
        studentName.clear();
        studentId.clear();
        quizMarks.clear();
        assignmentOneMarks.clear();
        assignmentTwoMarks.clear();
        examMarks.clear();
    });

    btnStudentMarks.setOnAction((event) -> {
        table.getItems().size();
        List<String> data = new ArrayList<>();
        double total_res = 0;
        for (Student item : table.getItems()) {
            total_res += item.getResult();
        }
        double avg_marks = total_res / table.getItems().size();

        averageMarksLabel.setText(Double.toString(avg_marks));

    });

    // Adding scene to the stage 
    primaryStage.setScene(scene);
    primaryStage.setResizable(false);
    //Displaying the contents of the stage 
    primaryStage.show();
    //button event for the new studnet addition bitton

}
/**
 * @param args the command line arguments
 */

}

---

输出

output

Answer 1

请检查此链接以了解tableview示例：

here

有些事情你忘了做：

• 当用户按AddnewStudent将一个新的学生对象放入板条箱并添加到要显示在表中的可观察列表（数据）时的操作

  btnAddNewStudent.setOnAction((event) -> {
  new Student (name.getText() , id.getText() , etc )
  // some code to do ..
  });