Java-从内部线程通知外部线程

Question

我对多线程非常陌生。我目前正在处理一个项目，该项目需要启动一个线程，完成后通知启动它的线程并继续执行。我尝试使用一个布尔变量，并指示系统打印出一些字符串来指示操作的阶段。查找下方的代码

public class BankDatabaseSQL {
private Connection connection;
private ResultSet resultSet;
private static final String URL = "jdbc:mysql://localhost/banktesting";
private static final String USERNAME = "root";
Account account;
public final Object monitor = new Object();
private PreparedStatement setBalance;
private PreparedStatement getAccount;
int numberOfRows;
/** code omitted **/
/**
   method in question
*/
public synchronized boolean authenticatePrint(){
    try{
        MainForm mainForm = new MainForm();
        do{
        ExecutorService threadExecutor = Executors.newCachedThreadPool();
        mainForm.accNo = account.getAccountNumber();
        threadExecutor.execute(mainForm);
        wait(); 
        }while(mainForm.verified = false); // while the verified variable of the mainForm object is set to false,
                                           // the thread should keep waiting. The process has not gotten into this
                                           // if statement. 
        if(mainForm.verified = true){
            System.out.println("time to notify");
            notify();
        }

应该进行通知的第二种方法如下所示

public class MainForm extends JFrame implements Runnable
{
 public void run() {
        new MainForm();
}
public synchronized void onVerify() {
    VerificationForm form = new VerificationForm(this);
    form.setVisible(true);
            System.out.println("nTime to onVerify");
            if(form.verificationStatus = true){
                verified = true; // variable for the mainForm object to aid in notifying the thread
                System.out.println("nVerified = true has been set!");
            }
    }
}

Answer 1

尝试在主线程中调用join()，如下所示：

mainThread.join（）

它将等待其他线程完成，然后主线程继续执行。

但是尝试使用其他多线程技术，如CountDownLatch、Barrier或Cyclic。