随笔分类 - Java 学习
摘要：设置Classpath的目的，在于告诉Java执行环境，在哪些目录下可以找到您所要执行的Java程序所需要的类或者包。 Java执行环境本身就是一个平台，执行于这个平台上的程序是已编译完成的Java程序(后面会介绍到Java程序编译完成之后，会以.class文件存在)。如果将Java执行环境比喻为操
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摘要：If the case of a compile-time constant, the compiler is allowed to "fold" the constant value into any calculations in which it's used; that is, the ca
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摘要：Inheritance doesn't just copy the interface of the base class. When you create an object of the derived class, it contains within it a subobject of th
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摘要：You can create a main() for each one of your classes; this technique of putting a main() in each class allows easy testing for each class. Even if you
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摘要：Access control is often referred to as implementation hiding. Wrapping data and methods within classes in combination with implemetation hiding is oft
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摘要：If you created a new package and inherit from a class in another package, the only members you have access to are the public members of the original p
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摘要：The private keyword means that no one can access the member except the class that contains that member, inside methods of that class.
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摘要：Note that compiled code is often placed in a different directory than source code, but the path to the compiled code must still be found by the JVM us
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摘要：静态主方法只能访问静态变量， 如果要访问动态变量，必须将变量实例化。 在JAVA程序中，除了主静态方法以及类方法之外，其他在该类下定义的实例变量、实例方法，在主类方法中调用时必须要将其实例化，就是要加上对象的引用。 Ordinarily, when you create a class you ar
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