Question: 3. [20 pts.] Explain the Observer design pattern and describe its character. Please write a fragment of program to implement Observer design pattern with your

3. [20 pts.] Explain the Observer design pattern and describe its character. Please write a fragment of program to implement Observer design pattern with your favorite programming language

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[20 pts.] Explain the Observer design pattern and describe its character. Please write a fragment of program to implement Observer design pattern with your favorite programming language

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