java两道题目——类的继承和多态机制

//vehicle类，public class Vehicle {
private float speed;
private String kind;
private String color;
public float getSpeed() {
return speed;
}
public void setSpeed(float speed) {
this.speed = speed;
}
public String getKind() {
return kind;
}
public void setKind(String kind) {
this.kind = kind;
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}

}//汽车类；public class Car extends Vehicle {
private int passenger; public int getPassenger() {
return passenger;
} public void setPassenger(int passenger) {
this.passenger = passenger;
} @Override
public String toString() {//现实所有的属性
return "speed="+this.getSpeed()+" kind="+this.getKind()+" color="+this.getColor()+" passenger="+this.getPassenger();
}

public static void main(String[] args){//测试
Car car=new Car();
car.setSpeed(60.5f);
car.setKind("汽车");
car.setColor("blue");
car.setPassenger(5);
System.out.println(car.toString());
}

}下面个题马上发上来，等下！