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定义一个交通工具(Vehicle)的类，定义私有属性： 速度(speed)、方向（direction),定义方法：设置速度setSpeed(int
speed))、改变速度changeSpeed(int speed),设置方向setDirection(int
direction),改变速度changeDirection(int direction)。最后在测试类 Vehicle 中的
main()中实例化一个交通工具对象direction:
1:North
2:South
3:East
4:West
输入：一行两个数
第一个数表示调用哪个方法（1：setSpeed 2:changeSpeed 3:setDirection 4:changeDirection)
第二个数表示输入的值
输出：方法名和私有属性的值
初始化速度为0，方向为North
例
输入：
1 1
输出：
setSpeed
speed = 1 direction = North
输入用例：
1 1
输出用例：
setSpeed
speed = 1 direction = North
输入用例：
2 1
输出用例：
changeSpeed
speed = 1 direction = North
输入用例：
3 2
输出用例：
setDirection
speed = 0 direction = South
以下为源码：
import java.util.Scanner;
public class Main{
public static void main(String[] args) {
Scanner sc=new Scanner(System.in);
Vehicle vehicle=new Vehicle();
int n=sc.nextInt();
int m=sc.nextInt();
switch (n){
case 1: System.out.println("setSpeed");
vehicle.setSpeed(m);
System.out.print("speed = "+vehicle.getSpeed()+" direction = North");
break;
case 2: System.out.println("changeSpeed");
vehicle.setSpeed(m);
System.out.print("speed = "+vehicle.getSpeed()+" direction = North");break;
case 3:System.out.println("setDirection");
vehicle.setDirection(m);
System.out.print("speed = 0"+" direction = "+vehicle.str);
break;
case 4:System.out.println("changeDirection");
vehicle.setDirection(m);
System.out.print("speed = 0"+" direction = "+vehicle.str);
break;
}
}
}
class Vehicle{
private int speed=0;
private int direction;
String str;
public void setSpeed(int speed){
this.speed=speed;
}
public int getSpeed(){
return speed;
}
public void setDirection(int direction){
switch (direction){
case 1:str="North";break;
case 2:str="South";break;
case 3:str="East";break;
case 4:str="West";break;
}
}
public void changeSpeed(int speed){
this.speed=speed;
}
public void changeDirection(int direction){
switch (direction){
case 1:str="North";break;
case 2:str="South";break;
case 3:str="East";break;
case 4:str="West";break;
}
}
}