java.lang.reflect.InvocationTargetExceptionという例外が出る

簡単なATMのシステムを作ろうとしています。

Exception in Application start method
java.lang.reflect.InvocationTargetException
以下略
caused by: java.lang.RuntimeException: Exception in Application start method
以下略
Caused by: java.lang.NumberFormatException: For input string: "金額を入力："
以下略

コンパイルし、実行すると上のように表示されます。どのように対処すればよいか教えていただきたいです。

import java.net.Socket;
import java.io.InputStream;
import java.io.DataInputStream;
import java.io.OutputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.net.UnknownHostException;

import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.Stage;
import javafx.geometry.Pos;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import java.util.*;

public class ATMClient extends Application {
  public static void main(String args[]) {
    launch();
  }

  public void start(Stage stage) {
    List<String> list = getParameters().getRaw();
    final int PORT = 5432;
    int money, deposit, withdraw, bal;

    stage.setTitle("ATM");
    HBox subPane = new HBox(10);
    subPane.setAlignment(Pos.CENTER);
    VBox root = new VBox(10);

    TextField tf = new TextField("金額を入力：");
    tf.setPrefSize(400,30);
    TextArea ta = new TextArea();
    ta.setPrefSize(400,300);

    Button b1 = new Button("入金");
    Button b2 = new Button("出金");
    b1.setPrefSize(50,30);
    b2.setPrefSize(50,30);
    subPane.getChildren().addAll(b1,b2);
    root.getChildren().addAll(tf,ta,subPane);

    Scene scene = new Scene(root);
    stage.setScene(scene);
    stage.show();

    money = Integer.parseInt(tf.getText());
    deposit = money;
    withdraw = money;

    b1.setOnAction(new EventHandler<ActionEvent>() {
      public void handle(ActionEvent event) {
        ta.appendText("入金：" + deposit + "円\n");
        tf.setText("");
      }
    });

    b2.setOnAction(new EventHandler<ActionEvent>() {
      public void handle(ActionEvent event) {
        ta.appendText("出金：" + withdraw + "円\n");
        tf.setText("");
      }
    });
    try(Socket s = new Socket(list.get(0),PORT);
        OutputStream out = s.getOutputStream();
        DataOutputStream dos = new DataOutputStream(out);
        InputStream in = s.getInputStream();
        DataInputStream dis = new DataInputStream(in)) {

      dos.writeInt(deposit);
      dos.writeInt(withdraw);
      bal = dis.readInt();
      if (bal < 0) {
        ta.appendText("残高不足：" + (-bal) + "円\n");
      }
    } catch (UnknownHostException e) {
      System.err.println("HOST'" + list.get(0) + "'is unknown");
    } catch (IOException e) {
      e.printStackTrace();
    }
  }
}