我想问问这几个方法怎么写啊,没有思路了,应该用到哪方面的知识,谢谢啦
3条回答 默认 最新
- 陈脩 2022-06-10 21:46关注
这里主要考察Java继承,子类和父类是is-a, Car和Bus都是交通工具
public class VehicleTest { public static void main(String[] args) { Car bmw = new Car(); bmw.setBrand("宝马"); bmw.setType("750"); System.out.println(bmw.info() + " : " + bmw.calRent(1)); Bus bus=new Bus(); bus.setBrand("大众"); bus.setSeatNum(8); System.out.println(bus.info()+" : "+bus.calRent(3)); } public static class Vehicle { private String no; private String brand; public String getNo() { return no; } public void setNo(String no) { this.no = no; } public String getBrand() { return brand; } public void setBrand(String brand) { this.brand = brand; } } public static class Car extends Vehicle { private static Map<String, Integer> rentMap = new HashMap<>(); static { rentMap.put("宝马750", 700); rentMap.put("大众polo", 400); rentMap.put("大众golf", 00); } private String type; public String info() { String str = getBrand() + getType(); return str; } public int calRent(int days) { return rentMap.getOrDefault(info(), 0) * days; } public String getType() { return type; } public void setType(String type) { this.type = type; } } public static class Bus extends Vehicle { private static Map<String, Integer> rentMap = new HashMap<>(); static { rentMap.put("<=20座", 800); rentMap.put(">20", 1200); } private int seatNum; private String info() { String info = seatNum <= 20 ? "<=20座" : ">20"; return info; } public int calRent(int days) { return rentMap.getOrDefault(info(), 0) * days; } public int getSeatNum() { return seatNum; } public void setSeatNum(int seatNum) { this.seatNum = seatNum; } } }
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