class Base{
????int
x = 1;
????static
int
y = 2;
????String name(){
????????return
"mother";
????}
????static String staticname(){
????????return
"static mother";
????}
}
class Subclass extends Base{
????int
x = 4;
????int
y = 5;
????String name(){
????????return
"baby";
????}
????static String staticname(){
????????return
"static baby";
????}
}
public
class Test02{
????public
static
void main(String[] args){
????????Subclass s = new Subclass();
????????System.out.println(s.x+" "+s.y+" "+s.name()+" "+s.staticname());
????????Base s1 = s;
????????System.out.println(s1.x+" "+s1.y+" "+s1.name()+" "+s1.staticname());
????}
}
?
/*
结果：
?
4 5 baby static baby
1 2 baby static mother
结论：
?
父类的实例方法被子类的同名实例方法覆盖
父类的静态方法被子类的同名静态方法隐藏
父类的实例变量和类变量可以被子类的实例变量和类变量隐藏
?
就"Base s1 = s"来说:把s赋值给s1时，s（子类）的方法name已经把父类的name方法覆盖了，却没有覆盖static name，而是隐藏了它。
赋值给s1后，s1的name方法已经变成了"baby",而staticname方法只是被隐藏而没有被覆盖，现在有还原成了"static mother"
*/