为什么不出体积的值？怎么办

Question

package application;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.GridPane;
import javafx.scene.layout.HBox;

public class Main extends Application {
TextField inputR=new TextField();
TextField inputH=new TextField();
TextField inputL=new TextField();
TextField vol=new TextField();
TextField sur=new TextField();
Button calbtn1=new Button("圆锥体积");
Button calbtn2=new Button("圆锥表面积");
Button clearbtn=new Button("清空");

@Override
public void start(Stage primaryStage) {
    try {
        GridPane root = new GridPane();
        root.setPadding(new Insets(20,20,20,20));
        root.setHgap(20);
        root.setVgap(20);
        root.setStyle("-fx-background-color:lightblue");
        
        
        root.add(new Label("请输入圆锥的底面半径"), 0, 0);
        root.add(inputR, 1, 0);
        root.add(new Label("请输入圆锥的高"), 0, 1);
        root.add(inputH, 1, 1);
        root.add(new Label("请输入圆锥的母线长"), 0, 2);
        root.add(inputL, 1, 2);
        root.add(new Label("圆锥体积为"), 0, 4);
        root.add(vol, 1, 4);
        root.add(new Label("圆锥的表面积为"), 0, 3);
        root.add(sur, 1, 3);
        
        
        HBox hb=new HBox();
        hb.setSpacing(60);
        hb.getChildren().addAll(calbtn1,calbtn2,clearbtn);
        hb.setAlignment(Pos.CENTER);
        root.add(hb, 0, 5,2,1);
        
        Police wang=new Police();
        calbtn1.setOnAction(wang);
        calbtn2.setOnAction(wang);
        clearbtn.setOnAction(wang);
        
        
        
        Scene scene = new Scene(root,400,400);
        scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
        primaryStage.setScene(scene);
        primaryStage.setTitle("求圆锥的体积");
        primaryStage.setTitle("求圆锥的表面积");
        primaryStage.setResizable(false);
        
        primaryStage.show();
    } catch(Exception e) {
        e.printStackTrace();
    }
}

public static void main(String[] args) {
    launch(args);
}
class Police implements EventHandler<A

Answer 1

好家伙，你这是圆锥吗，母线肯定要比半径长。母线要是和半径相等，高不就为0了吗