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import java.util.ArrayList;
public class Vehicle {
public void run(){
System.out.print("Vruum");
}
public void stop(){
System.out.print("stop!");
}
}
class Car extends Vehicle{
public void run(){
System.out.print("Car vruum");
}
public static void main (String... args){
ArrayList<Vehicle> cars = new ArrayList<Car>();
cars.run();
}
}
import java.util.ArrayList;
public class Vehicle {
public void run(){
System.out.print("Vruum");
}
public void stop(){
System.out.print("stop!");
}
}
class Car extends Vehicle{
public void run(){
System.out.print("Car vruum");
}
public static void main (String... args){
//还有,这句话不报错吗?我的jdk1.5
ArrayList<Vehicle> cars = new ArrayList<Car>();
//cars.run(); //这句话出错把,应该改为
cars.add(new Car());
cars.get(0).run();
}
}