demo1
class Person {
public void run(){
System.out.println("run.....");
}
}
class Superman extends Person {
public void fly(){
System.out.println("超音速飞....");
}
public void fire(){
System.out.println("喷火");
}
}
public class HelloWorld {
public static void main(String args[]){
Person per = new Person();
System.out.println(per instanceof Person);// true
System.out.println(per instanceof Superman);// false
}
}
demo2 向上转型
class Person {
public void run(){
System.out.println("run.....");
}
}
class Superman extends Person {
public void fly(){
System.out.println("超音速飞....");
}
public void fire(){
System.out.println("喷火");
}
}
public class HelloWorld {
public static void main(String args[]){
Person per = new Superman();// 向上转型
System.out.println(per instanceof Person);// true
System.out.println(per instanceof Superman);// true
}
}