请用javafx设计一个财务收支业务的程序，构建存钱、取钱两个线程。 存钱线程启动后，每隔1秒钟，随机往账户中存入[0,20]块钱。 每次存钱程序输出：in+空格+存入金额+空格+账户余额 当金额超过100时，唤醒取钱线程， 取钱线程被唤醒后，随机在账户中提取[50-100]块钱。 每次取钱程序输出：out+空格+支取金额+空格+账户余额

以下是一个使用 JavaFX 实现的财务收支业务程序：

import java.util.Random;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.concurrent.Task;
import javafx.scene.Scene;
import javafx.scene.control.Label;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

public class FinancialTransaction extends Application {

    private static final Random RANDOM = new Random();
    private static int balance = 0;

    @Override
    public void start(Stage stage) {
        Label balanceLabel = new Label("Balance: " + balance);
        StackPane root = new StackPane(balanceLabel);
        Scene scene = new Scene(root, 200, 100);
        stage.setScene(scene);
        stage.show();

        Thread depositThread = new Thread(new Task<Void>() {
            @Override
            protected Void call() throws Exception {
                while (true) {
                    int amount = RANDOM.nextInt(21);
                    synchronized (this) {
                        balance += amount;
                        Platform.runLater(() -> balanceLabel.setText("in " + amount + " " + balance));
                        if (balance > 100) {
                            notify();
                        }
                    }
                    Thread.sleep(1000);
                }
            }
        });

        Thread withdrawThread = new Thread(new Task<Void>() {
            @Override
            protected Void call() throws Exception {
                while (true) {
                    synchronized (depositThread) {
                        while (balance <= 100) {
                            depositThread.wait();
                        }
                        int amount = RANDOM.nextInt(51) + 50;
                        synchronized (this) {
                            balance -= amount;
                            Platform.runLater(() -> balanceLabel.setText("out " + amount + " " + balance));
                        }
                    }
                    Thread.sleep(1000);
                }
            }
        });

        depositThread.start();
        withdrawThread.start();
    }

    public static void main(String[] args) {
        launch();
    }

}

该程序使用 JavaFX 构建 UI，显示账户余额。存钱线程和取钱线程分别实现了 Runnable 接口，使用 synchronized 和 wait/notify 保证线程安全。存钱线程每隔1秒钟随机往账户中存入一定金额，当账户余额超过100时，唤醒取钱线程。取钱线程被唤醒后，随机在账户中提取一定金额。每次存钱和取钱操作后，程序会更新 UI 上的账户余额信息。