[JAVA] class inherits the parent class operation on the static variables

Why 80% of the code can not do farming architect? >>>  

There are some fuzzy operations exist on static variables when inherited, made a simple test:

class Test
{
	private String mName;

	public Test(String name) {
		setName(name);
	}

	public void setName(String name) {
		mName = name;
	}

	public String getName() {
		System.out.println(mName);
		return mName;
	}
}

class A {
	protected static String TAG = "A";
	protected static Test mTest;

	public A() {
		
	}

	public Test getTest() {
		return mTest;
	}
}

class B extends A
{
	protected static String TAG = "B";

	public B() {
		mTest = new Test(TAG);
	}
}

class C extends A
{
	protected static String TAG = "C";

	public C() {
		mTest = new Test(TAG);
	}
}

public class Demo
{
	public static void main(String[] args) {
		B b = new B();
		C c = new C();
		b.getTest().getName(); // print C
		c.getTest().getName(); // print C
    }
}

If there is a static variable in JAVA inherited superclass, subclasses, or operating with a static variable address, and therefore the operation is to subclass cover each other.

If the child class overrides the parent class methods and static variables are the exclusive sub-category, and the operation of other subclasses will not cover each other.

Reproduced in: https: //my.oschina.net/zhouz/blog/213133