java class access modifiers

Definition of Class 　 Modifier Meaning 1 None or internal Classes can only be accessed in the current project and cannot be accessed after other projects are referenced 2 Public can access the class anywhere 3 Abstract cannot be instantiated, only for inheritance

Questions for class member modifiers Class a{ private static $p 1; public static $p 2;} As in the code above, the member variable is preceded by the private static modifier and only with the private difference where? Similarly, where is the difference between public static and public? ------Solution-------------------- Static keyword: Declaring a

();Attention:1 "override method name, return value, parameter Table. Modifiers are the same as, or more broadly than, the parent class2 "static methods can only be overridden by static methods, and there is no polymorphism,What type is a reference type and what type of method is called?3. Initialize the code blockStatic initialization of code baseFunction: Assigning a value to a static propertyClass is executed once at load time, only onceClass Loadi

permission size for four rights modifiers (public, protected, default, private) Note: Default, does not have this keyword, it thinks that defaults, that is, nothing added!Generally, the default visibility is package visibility (package visibility). This class under the same package (subclasses and unrelated classes) under different packages (subclasses) under different packages

modifier typemodifierDescriptionaccess Control modifiersdefaultDefault (that is, default, nothing): It is visible within the same package , without any modifiers. Use objects: classes, interfaces, variables, methods. Private Private : visible within the same class. working with objects: variables, methods. Note: Classes cannot be decorated (external classes) PublicPublic : visible to all

comment/* Comment content * * Note: The content of the comment will not be compiled, just explain the description block comment/**..........*/Document comment change (values that can be changed) and constants (values that cannot be changed); Array of operator statements binary, decimal, hexadecimal; conversion between binary ()Eight basic data TypesNumeric: Integer: Byte, short, int (most commonly used), long (for larger data); Floating point (decimal): Float (single precision-) write the data

common modifiers used by classes and their components in Java(1) Classification of modifiers:　　 Permission modifiers:private, default, protected,　　　　 public status modifiers:static, Final　　　　 abstraction modifier:　　　 Abstract(2) modifiers used for common classes and their composition:　　of the Modified

. If a class is final, all methods in the class are final. Expansion and Promotion: Static,final and abstract are not able to modify the construction method Class loading Concept: When the JVM uses a class for the 1th time, it first finds the corresponding.

modifying a method, this method is loaded with the load of the class and is invoked directly by the class name. The methods in many tool classes are static and are invoked directly through the class name. Method Name. Non-static member variables and Non-static methods cannot be used in static methods. Static code block A static code block (a

The member variables of a Java class typically have the following access modifiers: Public, private, protected, or default, For example, in package first, if there is a class FirstClass with four variables: public int pp; private int Xiaopp; protected int DD; int xiaod

static properties;Final -The ultimate1, modifier class-The final class, the class cannot be inherited (the purpose is that the class can not be extended, that is, cannot be changed);2, the modification method-the final method, the method can not be overridden by the quilt class