二次作业1

package test;

public class vehicle {
    int speed;
    int size;
 public int getSpeed() {
  return speed;
 }
 public void setSpeed(int speed) {
  this.speed = speed;
 }
 public int getSize() {
  return size;
 }
 public void setSize(int size) {
  this.size = size;
 }
 public void SpeedUp(){
  this.speed++;
 }
 public void SpeedDown(){
  this.speed--;
 }
 public static void main(String[] args) {
  // TODO Auto-generated method stub
    vehicle aa=new vehicle();
    aa.setSize(50);
    System.out.println("体积为："+aa.getSize());
    aa.setSpeed(60);
    System.out.println("速度为："+aa.getSpeed());
    aa.SpeedUp();
    System.out.println("调用加速后为："+aa.getSpeed());
    aa.SpeedDown();
    System.out.println("调用减速后为："+aa.getSpeed());
 }

}