java场景生成器bmi计算器

Question

所以我一直在研究一个javaFX和Scene Builder项目来创建一个BMI计算器，而且似乎已经陷入了困境。关于我应该做什么的任何提示/建议？

其中一个要求是拥有两个交互式类以及控制器，fxml页面和应用程序启动器。第一类用于将英寸转换为cm，将lbs转换为kg，然后在第二类中使用它来计算bmi值和状态。

public class BMIInput {

private double heightIN;
private double heightCM;
private double weightKG;
private double weightLBS;
public double height;
public double weight;

public BMIInput() {
}

public double getHeight() {
    if (heightIN == 0) {
        height = heightCM;
    } else if (heightCM == 0) {
        height = (heightIN * 2.54);
    }
    return height;
}

public double getWeight() {
    if (weightLBS == 0) {
        weight = weightKG;
    } else if (weightKG == 0) {
        weight = (weightLBS / 2.205);
    }
    return weight;
}

public double setHeightIN(double height) {
    return this.heightIN = height;
}

public double setHeightCM(double height) {
    return this.heightCM = height;
}

public double setWeightKG(double weight) {
    return this.weightKG = weight;
}

public double setWeightLBS(double weight) {
    return this.weightLBS = weight;
}

}

二等：

public class BMICalculator {

BMIInput height;
BMIInput weight;
double bmiValue;

public double getBmiValue() {
    return bmiValue;
}

public void setBmiValue(double bmiValue) {
    this.bmiValue = bmiValue;
}

public double calculateBMI() {
    double heightDouble = Double.parseDouble(height.toString());
    double weightDouble = Double.parseDouble(weight.toString());

    bmiValue = (weightDouble / (heightDouble / 100.0) * (heightDouble / 100));

    return bmiValue;
}    

public String calculateStatus() {
    String value = "";
    if (bmiValue <= 18.5) {
        value = "Underweight";
    } else if (18.6 <= bmiValue && bmiValue <= 24.9) {
        value = "Normal weight";
    } else if (25 <= bmiValue && bmiValue <= 29.9) {
        value = "Overweight";
    } else {
        value = "Obesity";
    }
    return value;
}

和控制器：

import javafx.fxml.FXML; import javafx.scene.control.Button; import javafx.scene.control.TextField; public class AppController {

@FXML private TextField CMheightInput;
@FXML private TextField INheightInput;
@FXML private TextField KGweightInput;
@FXML private TextField LBSweightInput;
@FXML private Button buttonCalculate;
@FXML private TextField bmiValueOutput;
@FXML private TextField bmiStatusOutput;



BMICalculator calc = new BMICalculator();
BMIInput input = new BMIInput();

@FXML public void calculateBMI() {
    try {
        input.setHeightCM(Double.parseDouble(CMheightInput.getText()));
        input.setHeightIN(Double.parseDouble(INheightInput.getText()));
        input.setWeightKG(Double.parseDouble(KGweightInput.getText()));
        input.setWeightLBS(Double.parseDouble(LBSweightInput.getText()));

        bmiValueOutput.setText("" + calc.calculateBMI());

        bmiStatusOutput.setText("" + calc.calculateStatus());
    }
    catch (Exception e) {
        System.out.println("Something went wrong, try again.");
    }
}

如果有人有任何指示我会非常感激！ XX

Answer 1

您可能没有引用变量的实例...程序启动的Main方法在哪里？您必须在Java文件中加载FXMLController及其资源。尝试查看YouTube视频，了解如何在SceneBuilder中使用简单的JavaFX程序。其中一个我喜欢的是：How to use SceneBuilder