构造函数并不一定都是public的,以下的代码是不是另拟感到构造函数的奇特阿?
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public class Class1//永远无法被实例化的类
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{
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//这个类没有可以被外部访问的构造函数
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private Class1()
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{
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}
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}
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public class Class2//只可以在本程序内实例化的类
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{
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internal Class2()
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{
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}
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}
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public class Class3//只可以通过自身实例化的类
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{
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private Class3()
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{
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}
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//private的构造函数可以被自身的方法调用,所以可以用Class3.CreateClass3()来创建实例
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public static Class3 CreateClass3()
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{
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return new Class3();
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}
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}
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public class Class4
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{
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//Class4不能被实例化,但又要求子类在继承时构造有参
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protected Class4(int i)
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{ }
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}
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public class Class4Sub : Class4
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{
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public Class4Sub(int i)
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: base(i)
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{
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}
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}
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public class Class5//要求子类必须显示调用父类构造函数的
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{
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public Class5(int i)
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{ }
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}
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public class Class5Sub : Class5
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{
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public Class5Sub()
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: base(0)
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{ }
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public Class5Sub(int i)
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: base(i)
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{ }
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}
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