Interview: How to ensure that a thread runs after another?

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This would be the simplest, dumbest approach:

final Thread t1 = new Thread(new T1()); // assume T1 is a Runnable
t1.start();
t1.join();
final Thread t2 = new Thread(new T2());
t2.start();
t2.join();
final Thread t3 = new Thread(new T3());
t3.start();
t3.join();

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