package Pane;

import javafx.application.Application;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.TextField;
import javafx.scene.control.Label;
import javafx.scene.layout.GridPane;
 
 
public class javaFXBMI extends Application{
    private TextField tfHeight = new TextField();
    private TextField tfWeight = new TextField();
    private TextField tfBMI = new TextField();
    private TextField tfStatus = new TextField();
    private Button btCalculate = new Button("计算BMI");
    public void start(Stage primaryStage){
        GridPane bmiPane = new GridPane();  
        bmiPane.add(new Label("体重(公斤) "),0,0);
        bmiPane.add(tfWeight,1,0);
        bmiPane.add(new Label("身高(米)   "),0,1);
        bmiPane.add(tfHeight,1,1);
        bmiPane.add(new Label("BMI        "),0,2);
        bmiPane.add(tfBMI,1,2); 
        bmiPane.add(new Label("体重状况   "),0,3);
        bmiPane.add(tfStatus,1,3);
        bmiPane.add(btCalculate,1,4);
                     
        tfBMI.setEditable(false);       
        tfStatus.setEditable(false);        
         
        btCalculate.setOnAction(e->{
            double weight = Double.parseDouble(tfWeight.getText());
            double height = Double.parseDouble(tfHeight.getText());
 
                         double bmi = weight/(height * height);                          
            tfBMI.setText(bmi + "");
 
                         if ((bmi >= 18.5)&&(bmi < 25))   
                            tfStatus.setText("Normal");
                         else
                            tfStatus.setText("Abnormal");   
        });     
         
        Scene scene = new Scene(bmiPane,250,120);
        primaryStage.setScene(scene);
        primaryStage.setTitle("BMI计算");
        primaryStage.show();
    }
    public static void main(String[] args){
        Application.launch(args);
      }    
}