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7. Composition(组合) Composition: construct new object with existing objects. It is the relationship of "has-a". Ways of inclusion: Fully By reference 示 阅读全文
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5. Constructor(构造函数) If a class has a constructor, the compiler automatically calls that constructor at the point an object is created, before client 阅读全文
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4. 成员变量 4.1 Fields, parameters, local variables All three kinds of variable are able to store a value that is appropriate to their defined type. 4.1.1 阅读全文