课堂练习1

import java.util.Scanner;


public class Vehicle {
public static void main(String[] args) {
VehicleDemo car = new VehicleDemo();
car.setSize(32);
car.setSpeed(100);
car.speedUp();
car.speedDown();


}


}




class VehicleDemo {
private float speed, size,speedUp,speedDown;


public void move() {


}


public void setSpeed(float speed) {
this.speed=speed;
System.out.println("当前速度是："+this.speed);
}
public void setSize(float size) {
this.size=size;
System.out.println("当前大小是："+this.size);
}
public void speedUp() {
this.speed++;
System.out.println("已加速！！当前速度是："+this.speed);
}
public void speedDown() {
this.speed--;
System.out.println("已减速！！当前速度是："+this.speed);
}


}