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Calling Another Constructor if the first statement of a constructor has the form this(...), then the constructor calls another ... 阅读全文
posted @ 2017-06-28 15:42
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Calling Another Constructor if _the first statement of a constructor_ has the form , then the constructor calls another constructor of the same class. 阅读全文
posted @ 2017-06-28 15:42
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If a class supplies at least one constructor but does not supply a no argument constructor, it is illegal to construct objects without supplying argum 阅读全文
posted @ 2017-06-28 13:39
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If a class supplies at least one constructor but does not supply a no-argument constructor, it is illegal to construct objects w... 阅读全文
posted @ 2017-06-28 13:39
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Instead, object references are passed by value! A method cannot modify a parameter of a primitive type.A method can change the ... 阅读全文
posted @ 2017-06-28 12:21
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Instead, object references are passed by value ! A method cannot modify a parameter of a primitive type. A method can change the state of an object pa 阅读全文
posted @ 2017-06-28 12:21
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Every class can have a main method. That is a handy trick for unit testing of classes. For example, you can add a main method to the Employee class: _ 阅读全文
posted @ 2017-06-28 11:15
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Every class can have a main method. That is a handy trick for unit testing of classes. For example, you can add a main method to... 阅读全文
posted @ 2017-06-28 11:15
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The main Method You can call static methods without having any objects. For example, you never construct any objects of the Mat... 阅读全文
posted @ 2017-06-28 11:01
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The main Method You can call static methods without having any objects. For example, you never construct any objects of the Math class to call Math.po 阅读全文
posted @ 2017-06-28 11:01
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The static factory method pattern is a way to encapsulate object creation. Without a factory method, you would simply call the class's constructor dir 阅读全文
posted @ 2017-06-28 10:57
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The static factory method pattern is a way to encapsulate object creation. Without a factory method, you would simply call the c... 阅读全文
posted @ 2017-06-28 10:57
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If you define a field as static, then there is only one such field per class. In contrast, each object has its own copy of al... 阅读全文
posted @ 2017-06-28 10:44
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If you define a field as static , then there is only one such field per class. In contrast, each object has its own copy of all instance fields. For e 阅读全文
posted @ 2017-06-28 10:44
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` a`, append Add the user to the supplementary group(s). Use only with the G option. , groups GROUP1[,GROUP2,...[,GROUPN]]] A list of supplementary gr 阅读全文
posted @ 2017-06-28 10:37
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-a, --append Add the user to the supplementary group(s). Use only with the -G option. -G, --groups GROUP1[,GROUP2,...[,G... 阅读全文
posted @ 2017-06-28 10:37
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