Wait until child threads completed : Java

Question

Problem description : -

Step 1: Take input FILE_NAME from user at main thread.

Step 2: Perform 10 operations on

Answer 1

You can do:

Thread t = new Thread() {
    public void run() {
        System.out.println("text");
        // other complex code
    }
 };
 t.start();
 t.join();

This way you will wait until the thread finishes and just then continue. You can join multiple threads:

for (Thread thread : threads) {
  thread.join();
}