1.请定义一个交通工具(Vehicle)的类,其中有:
Ø 属性:速度(speed),体积(size)等
Ø 方法:移动(move()),设置速度(setSpeed(int speed)),设置体积(setSize(int size))加速speedUp(),减速speedDown()等
在测试类Vehicle中的main()中实例化一个交通工具对象,通过方法给它初始化speed,size的值,并打印出来。另外,调用加速,减速的方法对速度进行改变。
public class Vehicle {
int speed;
int size;
Vehicle(){
speed=0;
size=0;
}
public void move(){
}
public void setSpeed(int speed){
this.speed=speed;
}
public void setSize(int size){
this.size=size;
}
public void speedUp(int i){
speed+=i;
}
public void speedDown(int j){
speed-=j;
}
public String toString(){
return "speed:"+speed+",size:"+size;
}
}
public class TestVehicle {
public static void main(String[] args) {
// TODO Auto-generated method stub
Vehicle v=new Vehicle();
v.setSpeed(4);
System.out.println(v);
v.setSize(5);
System.out.println(v);
v.speedUp(6);
System.out.println(v);
v.speedDown(7);
System.out.println(v);
}
}