how to access private variables from another class in java

Java learning diary 8-package, environment variables and access control, java8- Java packages, environment variables, and Access Control 1. java package

clearly. Classpath is generally set to ".; %java_home%\lib\dt.jar;%java_home%\lib\tools.jar; " Where. Represents the current directory, and%java_home% represents the path to the JAVA jdk. The main dt.jar are the various control classes in the swing package. The Tools.jar is a variety of tool classes. When the compiler encounters the import statement, it starts looking in the directory contained in the CLASSPATH. (Reference: http://www.linuxidc.co

Tag: Lin Line This instance uses ring print void logA class variable is also called a static variable, a variable that is defined within a class that all methods can access, and a class method similar to the global variable static int = 123;java is decorated with the static

1 keyword thisThe implicit parameter (Page 106,java core Technology), which represents the current class, is used internally within the class definition, distinguishing member variables and local variables with the This member variable name .2

start is called, non-final variables will disappear, and the internal class reference will be invalid! Practice: The behavior of the java compiler is as follows (the precondition is that the variable is referenced in the internal class ):If it is defined as final, the java

address is canceled.——————————————————————Member variables are divided into instance variables and class variables, and variables modified with static are class variables.Class variables:Class, when the

Interface ImplementationWhat is a data type? in Java, the data and methods are wrapped in a class, and the result is a data type that hides the specific implementation. (Encapsulation produces data types)Lenovo to the eight basic data types, all have the above characteristics.Because of the above characteristics of the data type, the creator divides the boundary of the permission within the data type, separ

) need to note:1. Overriding overrides is required for the return type, while the overloaded overload does not require a return type.Overloading can change the return type. Because the compiler can statically compile different methods by identifying the signature of the method. This is also one of the differences between overloading and rewriting in Java.2. Strictly speaking, overrides are polymorphic because they are dynamic bindings (or dynamic bind

Most of the time, a class is defined as a separate program unit. In some cases, a class is also placed within the internal definition of another class, which is called an inner class, and the class containing the inner class is al

1. Private: In the same class2. Default: Classes in the same package3. Protection: In a class subclass in the same package (inheritance)4. Public: No scopeWhen you create subclasses and override methods, you must consider the access control of the original method:As a general rule, the overriding method is that the access