106 lines
4.0 KiB
Java
106 lines
4.0 KiB
Java
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import javafx.application.Application;
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import javafx.event.ActionEvent;
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import javafx.geometry.Insets;
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import javafx.geometry.Pos;
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import javafx.scene.Scene;
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import javafx.scene.control.Button;
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import javafx.scene.control.TextField;
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import javafx.scene.layout.FlowPane;
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import javafx.scene.text.Text;
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import javafx.stage.Stage;
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import java.text.DecimalFormat;
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public class GPACalculator extends Application {
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FlowPane flowPane = new FlowPane();
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Text textPointsForCourse = new Text("Welcome to my GPA Calculator!");
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Text textCumulativeGPA = new Text("Enter your 1ˢᵗ grade and credit hrs.");
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TextField textFieldCLG = new TextField("");
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TextField textFieldCCH = new TextField("");
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Text textCLG = new Text("Course letter grade:");
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Text textCCH = new Text("Course Credit hours:");
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Button buttonAddGPA = new Button("Add to GPA");
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Button buttonClearGPA = new Button("Clear GPA");
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double GPA;
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double totalCreditHours;
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double totalGradePoints;
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public static void main(String[] args) {
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launch(args);
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}
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@Override
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public void start(Stage primaryStage) {
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primaryStage.setTitle("GPA Calculator");
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flowPane.setPadding(new Insets(10, 10, 10, 10));
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flowPane.setHgap(10);
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flowPane.setVgap(10);
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flowPane.setAlignment(Pos.CENTER);
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buttonAddGPA.setOnAction(this::AddGPA);
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buttonClearGPA.setOnAction(this::ClearGPA);
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textFieldCCH.setPrefWidth(50);
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textFieldCCH.setOnAction(this::AddGPA);
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textFieldCLG.setPrefWidth(50);
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textFieldCLG.setOnAction(actionEvent -> textFieldCCH.requestFocus());
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flowPane.getChildren().addAll(
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textCLG, textFieldCLG,
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textCCH, textFieldCCH,
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buttonAddGPA, buttonClearGPA,
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textPointsForCourse,
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textCumulativeGPA);
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primaryStage.setScene(new Scene(flowPane, 210, 190));
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primaryStage.setResizable(false);
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primaryStage.show();
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}
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private void ClearGPA(ActionEvent actionEvent) {
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textCumulativeGPA.setText("Enter your 1ˢᵗ grade and credit hrs.");
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textPointsForCourse.setText("Totals have been reset");
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textFieldCCH.setText("");
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textFieldCLG.setText("");
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totalCreditHours = 0;
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totalGradePoints= 0;
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GPA = 0;
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}
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private void AddGPA(ActionEvent actionEvent) {
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double creditHours = Double.parseDouble(textFieldCCH.getText());
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double gradePoints = 0;
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String letterGrade = textFieldCLG.getText();
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switch (letterGrade.toUpperCase()) {
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case "A+":
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gradePoints = 4.3*creditHours; break;
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case "A":
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gradePoints = 4.0*creditHours; break;
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case "A-":
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gradePoints = 3.7*creditHours; break;
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case "B+":
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gradePoints = 3.3*creditHours; break;
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case "B":
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gradePoints = 3.0*creditHours; break;
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case "B-":
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gradePoints = 2.7*creditHours; break;
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case "C+":
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gradePoints = 2.3*creditHours; break;
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case "C":
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gradePoints = 2.0*creditHours; break;
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case "D":
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gradePoints = 1.0*creditHours; break;
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case "F":
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case "WF":
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gradePoints = 0.0; break;
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default:
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textPointsForCourse.setText("Invalid Grade - GPA not changed");
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break;
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}
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DecimalFormat df = new DecimalFormat("#.0");
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textPointsForCourse.setText("Points for this course: " + df.format(gradePoints));
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totalCreditHours = totalCreditHours + Double.parseDouble(textFieldCCH.getText());
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totalGradePoints = totalGradePoints + gradePoints;
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GPA = totalGradePoints/totalCreditHours;
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textCumulativeGPA.setText("Your cumulative GPA is: " + df.format(GPA));
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}
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}
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