Java Note--static

1.static modifier variables

 Public class MyClass {    staticint i = 4;}

Where the static modifier variable, which indicates that the variable i belongs to the MyClass class, all objects share a variable, it is recommended to use the class name to access the static variable (1. The static design structure is emphasized; 2. Provides an opportunity for compiler optimizations);

Do not use private to modify the static variable, otherwise it cannot be accessed with the class name.

2.static Modification Method

 Public class incrementable {    staticvoid  increment () {        myclass.c+ +;    }}

The static modifier method and the modifier variable are the same, and the static method can only access static member variables and methods of this class, and cannot access non-static variables and methods;

The main function is defined as static to provide a portal for the program.

3.stack Modified Class

Static can only decorate inner classes

 Public class MyClass {    staticclass  sclass {        publicvoid  Hello () {                    }    }}

Sometimes it is possible to write the main function to an inner class (static Class) without having to write a main method for each file.

4.static Block

 Public class MyClass {    static  {        = 1;    }     Static int A;}

Static blocks are executed only once when the class is loaded, and are typically used to initialize both statically variable and static methods.

Java Note--static