【求助】实现接口里的方法为什么创建对象得不到体现?
package bianchen;
public interface dispay {
void display();
}
class notice implements dispay{
public void display() {
System.out.println("通知内容");
}
}
class car implements dispay{
public void display(){
System.out.println("汽车油量");
}
}
class ad implements dispay{
public void display() {
System.out.println("广告消息");
}
}
class ex{
public static void main(String args[]){
notice n = new notice();
n.display();
car c = new car();
c.display();
ad a = new ad();
a.display();
}
}