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;
int z = 6;
String name(){
return "baby";
}
static String staticname(){
return "static baby";
}
}
public class Test02{
public static void main(String[] args){
Subclass s = new Subclass();
if(s instanceof Subclass){
System.out.println(s.x+" "+s.y+" "+s.name()+" "+s.staticname());
}
Base s1 = s;
if(s1 instanceof Subclass){
System.out.println(s1.x+" "+s1.y+" "+s1.name()+" "+s1.staticname());
}
Base s2 = new Base();
if(s2 instanceof Subclass){
System.out.println(s2.x+" "+s2.y+" "+s2.name()+" "+s2.staticname());
}
}
}
/*
结果：
4 5 baby static baby
1 2 baby static mother
结论：
instanceof 用来判定对象A是否为类B的对象，或者A,B之间是否存在继承关系
如果A,B之间是不否存在继承关系，则编译不过
*/