[Đa luồn - Multithreading]Phần 1: Khởi tạo một thread

- Có hai cách tạo một thread mới là:
1. Extends class Thread:

2. Hiện thực interface Runnable:

Kết quả:

Hai thread khi sleep.

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Hai thread khi không sleep: (bỏ dòng Thread.sleep(100); trong phương thức run)
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