Question

我正在创建一个BMI理想体重计算器，提示用户在文本框中输入数据或信息，例如他们的姓名，身高，体重（体重可以是公制，也就是公斤或英制），高度可以是米或英尺。我也使用一个单选按钮，两个不同的单位来区分性别（男性或女性），因为男性和女性有不同的BMI。我应该参考的信息和公式在下面的照片中，但我的问题是到目前为止，当我编码时，我只是测试男性单选按钮，因为我完成了它，没有输出到我的jLabel aka lblOutput ... 以下是我想要的简要说明： 1）提示用户点击性别（radiobutton） 2）然后需要用户填写信息 3）假设输出BMI并告诉人们它是否正常，体重不足等。这是代码（到目前为止我所拥有的）：

    String name = txt1.getText();
    double Metric = Double.parseDouble(txt2.getText());
    double Imperial = Double.parseDouble(txt2.getText());

    double metres = Double.parseDouble(txt3.getText());

    double inches = Double.parseDouble(txt4.getText());
    double kgs = Double.parseDouble(txt5.getText());
    double pounds = Double.parseDouble(txt5.getText());
    double weight;
    double weight2;
    int m = 1;
    int i =2;
    int me =3;
    int in=4;

    if (rdbMale.isSelected()) {
    if (Metric==m) {
      //inches = System.null(); //need to learn how to make it null or dissapear if user inputs for metric instead of imperial
    weight = metres/Math.pow(kgs, 2);
    lblOutput.setText("Your name is " + name + " and your ideal weight in kgs is " + String.format("%.2f", weight));
    }
    } else if (Imperial==i) {
    weight2 = inches/Math.pow(pounds, 2)*703;
    lblOutput.setText("Your name is " + name + " and your ideal weight in pounds is " + String.format("%.2f", weight2));
    }              

   // some codes are unneccessary like the int me, or the int in i used them so i can distinguish between which one the user wants to chose from either 3 for metres or 4 for inches, pls ignore that
   //I basically just want this to work and I don't know how to get it to work

创建BMI理想体重计算器（遇到一些错误）

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