J002.关于static变量

J002.关于static变量

//:StaticTest.java
class StaticClass
{
    static int i = 1;
    int j = 2;
}

class StaticTest
{

    public static void main(String[] args) 
    {
        StaticClass st1 = new StaticClass();
        StaticClass st2 = new StaticClass();

        st1.i ++ ;
        st1.j ++ ;

        System.out.println("st1.i = " + st1.i + "   st1.j = " + st1.j);
        System.out.println("st2.i = " + st2.i + "   st2.j = " + st2.j);

    }
}
/*
Output:
    st1.i = 2  st1.j = 3
    st2.i = 2  st2.j = 2
*///:~

所以，static变量只占用一个存储空间，即为“class data”,”meaning that the data and method exist only for the class as a whole,and not for any particular objects of class”(Thinking in Java)