對於我正在制作的 GUI，我不確定如何在 Javafx 中讓不同類中給出的這些值相互連接

Question

這是 Javafx，我正在制作一個包含多個類的 GUI。

代碼：

import javafx.application.Application;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;
import javafx.stage.Stage;

public class AutoLoanCalculator extends Application{

    public static void main(String[] args) {
          launch(args);
       }
    
    
    public void start(Stage primaryStage) {
        
        
        PaymentSection section1 = new PaymentSection();
        LoanTermSection section2 = new LoanTermSection();
        FinancingSection section3 = new FinancingSection();
        OptionsSection section4 = new OptionsSection();
        
        Button calc = new Button("Calculate");
        Button reset = new Button("Reset");
        Button exit = new Button("Exit");
        
        GridPane comboGrid = new GridPane();
        comboGrid.add(section1, 0, 0);
        comboGrid.add(section2, 1, 0);
        comboGrid.add(section3, 0, 1);
        comboGrid.add(section4, 1, 1);
        comboGrid.add(calc, 0,2);
        comboGrid.add(reset, 1,2);
        comboGrid.add(exit, 2,2);
        
        HBox combo = new HBox();
        combo.getChildren().add(comboGrid);
        
        calc.setOnAction(event ->{
            
            Double basePrice = Double.parseDouble(section3.getPriceNum());
            Double downPayment = Double.parseDouble(section3.getDownPayNum());
            Double taxRate = Double.parseDouble(section3.getTaxNum()) / 100;
            Double optionPrice = section4.getCost();
            Double interestRate = section2.getRate() / 100;
            int loanTermMonths = section2.getMonth();
            
            //calculates the values of rate and total sales tax
            double rate = interestRate/12;
            double salesTaxAmt = (basePrice - downPayment + optionPrice) * taxRate;
            
            Double totalLoanAmt = basePrice - downPayment + optionPrice + salesTaxAmt;
            Double monthPayment = totalLoanAmt * (rate * Math.pow(1 + rate, loanTermMonths)) / (Math.pow(1 + rate, loanTermMonths) - 1);
            Double totalPayment = monthPayment * loanTermMonths + downPayment;
            
            //section1.setLoanNum(String.format("%.2f", totalLoanAmt));
            
            System.out.println(basePrice);
            System.out.println(downPayment);
            System.out.println(taxRate);

        });
        
        reset.setOnAction(event ->{
            section1.reset();
            section2.reset();
            section3.reset();
            section4.reset();
        });
        
        exit.setOnAction(event ->{
            primaryStage.close();
        });
        
        Scene scene = new Scene(combo);
        primaryStage.setTitle("Auto Loan Calculator");
        primaryStage.setScene(scene);
        primaryStage.show();
    }
}

//我稱這個部分為1

import javafx.scene.control.Label;

import javafx.scene.layout.GridPane;

public class PaymentSection extends GridPane{

    private Label payInfo;
    private Label loanAmount;
    private Label monthlyPayment;
    private Label totalPayment;
    private Label loanNum;
    private Label monthNum;
    private Label totalNum;
    private String loanInt;
    private String monthInt;
    private String totalInt;
    
    public PaymentSection () {
        payInfo = new Label("Payment Information");
        loanAmount = new Label("Total Loan Amount: $ ");
        monthlyPayment = new Label("Monthly Payment: $ ");
        totalPayment = new Label("Total Payment: $ ");
        
        loanNum = new Label();
        monthNum = new Label();
        totalNum = new Label();
        
        
        
        loanNum.setText("0.0");
        monthNum.setText("0.0");
        totalNum.setText("0.0");
    
        
        add(payInfo,0,0);
        add(loanAmount,0,1);
        add(monthlyPayment,0,2);
        add(totalPayment,0,3);
        add(loanNum,1,1);
        add(monthNum,1,2);
        add(totalNum,1,3);
        setStyle("-fx-padding: 10;" +
                "-fx-border-style: solid inside;" + 
                "-fx-border-width: 2;" +
                "-fx-border-color: black;");
        }
    

    public String setLoanNum(String string) {
        return loanInt;
    }
    
    public void reset() {
        loanNum.setText("0.0");
        monthNum.setText("0.0");
        totalNum.setText("0.0");
    }
    
}

//我稱這個部分為 3

import javafx.scene.control.Label;
import javafx.scene.control.TextField;
import javafx.scene.layout.GridPane;

public class FinancingSection extends GridPane{

    private Label finance;
    private Label price;
    private Label tax;
    private Label downPay;
    private TextField priceNum;
    private TextField taxNum;
    private TextField downPayNum;
    private String priceInt;
    private String downPayInt;
    private String taxInt;
    

    public FinancingSection() {
        
        LoanTermSection term = new LoanTermSection();
        term.getRate();
        
        finance = new Label("Fianancing Information");
        price = new Label("Base Price: $ ");
        downPay = new Label("Down Payment: $ ");
        tax = new Label("Sales Tax: % ");
        
        priceNum = new TextField("0.0");
        downPayNum = new TextField("0.0");
        taxNum = new TextField("7.0");
        
        priceInt = priceNum.getText();
        downPayInt = downPayNum.getText();
        taxInt = taxNum.getText();
        
        add(finance,0,0);
        add(price,0,1);
        add(downPay,0,2);
        add(tax,0,3);
        add(priceNum,1,1);
        add(downPayNum,1,2);
        add(taxNum,1,3);
        setStyle("-fx-padding: 10;" +
                "-fx-border-style: solid inside;" + 
                "-fx-border-width: 2;" +
                "-fx-border-color: black;");
        
        
    }
    
    public String getPriceNum() {
        return priceInt;
    }
    public void setPriceNum(String newPriceNum) {
        priceInt = newPriceNum;
    }
    
    public String getDownPayNum() {
        return downPayInt;
    }
    public void setDownPayNum(String newDownPay) {
        downPayInt = newDownPay;
    }
    
    public String getTaxNum() {
        return taxInt;
    }
    public void setTaxNum(String newTax) {
        taxInt = newTax;
    }
    
    public void reset() {
        priceNum.setText("0.0");
        downPayNum.setText("0.0");
        taxNum.setText("7.0");
    }
    
}

問題是我無法設置 basePrice、downPayment 和 taxRate - 我無法從第 3 節代碼中設置的值中獲取它們：我想使用 setter 和 getter 但它似乎不起作用而且我是不知道為什么或如何解決它。- 也許這與我將它們設置為的價值觀有關 - 真的不確定。 至於第 1 節，我無法打印它——我假設這與第 3 節是同一個問題。所以主要是我只需要幫助獲取第 3 節的值。 提前致謝！

Answer 1

您需要在檢索值時對文本字段調用getText() 。 所以，例如，

public class FinancingSection extends GridPane{

    // ...

    public String getPriceNum() {
        return priceNum.getText();
    }

    // ...
}

您可能可以刪除priceInt變量等，並且您可能應該刪除FinancingSection中未使用的設置方法。

您在PaymentSection中使用的設置方法應更新其相應的標簽，例如

public class PaymentSection extends GridPane{

    // ...

    public void setLoanNum(String string) {
        loanNum.setText(string) ;
    }

    // ...

}