关于抽象类的课外练习 - 黑马程序员技术交流社区

package demo.demo;
import demo.demo.Car;
import demo.demo.CarDemo;
import demo.demo.NoValueException;
import demo.demo.NoYouException;
import demo.demo.SWC;
/**
* 一个复习抽象类的好题与大家一起练习：
需求：1.先描述汽车的抽象类，该类有汽车品牌、汽车用油型号、汽车当前油量等几个属性，
同时定义一个加油普通函数和一个开车的抽象方法
2.定义一个商务小车类继承汽车抽象类，
商务小车类有汽车颜色、汽车价格等新属性（其他熟悉可自己添加一两个）。
同时在该类中重写加油、开车两个方法。要求在加油函数中增加汽车当前油量，在开车方法中减少汽车当前油量，并实时打印出当前油量。
* 油箱可装200升
*/
abstract class Car {
private String pingPai,xingHao;
public String getPingPai() {
return pingPai;
}
public void setPingPai(String pingPai) {
this.pingPai = pingPai;
}
public String getXingHao() {
return xingHao;
}
public void setXingHao(String xingHao) {
this.xingHao = xingHao;
}
public int getYouLiang() {
return youLiang;
}
public void setYouLiang(int youLiang) {
this.youLiang = youLiang;
}
private int youLiang;
public void jiaYou(int num){
youLiang+=num;
}
public abstract void run(int gongLi,int yiPaoGongLi)throws NoYouException;
public Car(){
}
public Car(String pingPai,String xingHao){
this.setPingPai(pingPai);
this.setXingHao(xingHao);
this.setYouLiang(100);
}
}
class SWC extends Car{
private String color;
private int pay,runGongli;
public SWC(String pingPai,String xingHao,String color,int pay){
super(pingPai,xingHao);
this.setColor(color);
this.setPay(pay);
}
public SWC(){
}
public String getColor() {
return color;
}
public void setColor(String color) {
this.color = color;
}
public int getPay() {
return pay;
}
public void setPay(int pay) {
this.pay = pay;
}
public void jiaYou(int num){
this.setYouLiang(this.getYouLiang()+num);
System.out.println("已加油"+num+"升");
}
public void run(int gongLi,int yiPaoGongLi)throws NoYouException{
for(int i=0;i<gongLi;i++){
if(this.getYouLiang()<8){
throw new NoYouException("车油量不足，已跑公里"+yiPaoGongLi);
}
//没跑一公里耗费8升油
this.setYouLiang(this.getYouLiang()-8);
runGongli++;
yiPaoGongLi++;
}
System.out.print(this.getPay()+"商务车："+this.getColor()+this.getPingPai()+this.getXingHao()
+"已跑"+runGongli+"公里"+"还剩"+this.getYouLiang()+"升油");
}
}
class NoYouException extends Exception{
public NoYouException(){
super("车油量不足");
}
public NoYouException(String message){
super(message);
}
}
class NoValueException extends RuntimeException{
public NoValueException(){
super("已跑距离大于为跑距离");
}
}
public class CarDemo{
SWC car=null;
public static void main(String[] args) {
new CarDemo().run(30,0);
}
public void run(int gongLi,int yiPaoGongLi){
if(yiPaoGongLi>gongLi){
throw new NoValueException();
}
if(car==null){
car=new SWC("兰博基尼","LF23","黑色",1000000);
}
car.jiaYou(100);
try {
car.run(gongLi, yiPaoGongLi);
} catch (NoYouException e) {
String str=e.getMessage();
str=str.substring(str.indexOf("里")+1, str.length());
yiPaoGongLi=Integer.parseInt(str);
// System.out.println(yiPaoGongLi);
gongLi-=yiPaoGongLi;
yiPaoGongLi=0;
run(gongLi,yiPaoGongLi);
}
}
}

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