static methods and static code blocks

Precautions:

1. Static code blocks cannot write this or object, because static blocks of code are executed before the object is initialized;

2. Static code blocks are executed before code blocks are constructed;

3. Static code blocks are used to initialize classes and execute only once;

4. Static methods can only access static members;

Execution order: Static code block, construction code block--construction method

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static methods and static code blocks