Quick start to static class variables

Name of class variable ： Static variables / Class variables / Class properties

Class attribute concept ： It is an independent space belonging to class （ This space is created when the class is loaded ）, Every object created by this class can operate on it （ share ）.

Class variable definition and access ：

Definition grammar ：

//static  It's a modifier , You can modify properties and methods 
public static int totalNum = 0;

Access Syntax ( There are two ways to access )：

1, Directly access... By class name

2, Access... By object name

class Test {
// Class name . Class variables 
// explain ： Class variables are created as the class loads , So you can access... Even if you don't create an object instance .
    public static void main（System[] args）{
        // Access... By class name 
        System.out.println(A.name);
        A a = new A();
        // Access... By object name 
        System.out.println(a.name);
    }
}

class A {
    // Class variables 
    String static name = " Xiao Ping ";
}

matters needing attention ：

  Access to class variables , The relevant access rights must be observed .