How to make the main() thread wait?

Question

I would like to know how to make the main() thread wait for another thread?If I use wait() method in main() method it says "non-static method wait() cannot be referenced from a static context",since main()
is static.

Answer 1

Here is an example how you may wait for a Thread in the main -
but be careful, this is no real OO:
public class WaitMain {
// this is the thread class - you may also create
// a runnable - I use a inner class to
// keep my example simple
     public static class ThreadWait extends Thread{
          public void doSomething(){
               synchronized(syncObject){
                    System.out.println("Do Something");
                    syncObject.notify();
          public void run(){
               // sleep 10 seconds - this is
               // a placeholder to do something in the thread
               try{
                    sleep(10000);
                    doSomething();
                    sleep(10000);
               catch(InterruptedException exc){
// this is the object we wait for -
// it is just a synchronizer, nothing else
     private static Object syncObject = new Object();
     public static void main(String[] args) {
          System.out.println("This will start a thread and wait for \"doSomething\"");
          ThreadWait t= new ThreadWait();
          t.start();
          synchronized(syncObject){
               try{
// this will wait for the notify
                    syncObject.wait();
                    System.out.println("The doSomething is now over!");
               catch(InterruptedException exc){
          // do your stuff