java测试题（四）--答案

Calendar cal=Calendar.getInstance(); cal.add(Calendar.DAY_OF_YEAR,10); String strDate=cal.get(Calendar.YEAR)+”年“ +(cal.get(Calendar.MONTH)+1)+”月“ +cal.get(Calendar.DATE)+”日“;

System.out.println(“10天后的日期为：“+strDate); } }

3、请定义一个交通工具(Vehicle)的类��其中有: 属性�ㄋ俣�(speed)��体积(size)等等 方法�ㄒ贫�(move())��设置速度(setSpeed(int speed))�Ъ铀賡peedUp(),减速speedDown()等等. 最后在测试类Vehicle中的main()中实例化一个交通工具对象�Р⑼ü�方法给它初始化speed,size的值�Р⑶彝ü�打印出来。另外�У饔眉铀侏Ъ跛俚姆椒ǘ运俣冉�行改变。

参考代码： public class Vehicle {

private int speed; private String size; public void move()

{

System.out.println(\}

public void setSpeed(int speed) { }

public void speedUp() { }

public void speedDown() {

Vehicle v=new Vehicle(); }

public static void main(String[] dsa) {

Vehicle v=new Vehicle(); v.speed=100; v.size=\v.setSpeed(20); Vehicle v=new Vehicle(); v.setSpeed(1000);

System.out.println(\

System.out.println(\initial speed is\my size is

\ }

v.speedUp(); v.speedDown(); }