简易停车场-版本1

代码

car

package com.ebaotech.demo;

public class Car {
    
    
    public Car() {
    
    
    }

}

Voucher

package com.ebaotech.demo;

public class Voucher {
    
    
    public Voucher() {
    
    
    }
}

ParkingLot

package com.ebaotech.demo;

import org.junit.jupiter.api.Test;

import java.util.HashMap;

public class ParkingLot {
    
    
    private final int CAPACITY = 1;

    //初始化map
    HashMap<Voucher,Car> hashMap=new HashMap<>(CAPACITY);

    //存车
    public Voucher saveCar(Car car) throws MyException {
    
    
        Voucher voucher=new Voucher();
        if(hashMap.size()<CAPACITY) {
    
    
            hashMap.put(voucher, car);
        }else {
    
    
            throw new MyException("存取车位失败");
        }
        return voucher;
    }

    //取车
    public Car pickUpCar(Voucher voucher) throws MyException {
    
    
        Car car=hashMap.get(voucher);
        if(car!=null) {
    
    
            hashMap.remove(voucher);
        }else {
    
    
            throw  new MyException("凭证失效");
        }
        return car;
    }
}

MyException

package com.ebaotech.demo;

public class MyException extends Exception{
    
    
    public MyException() {
    
    
        super();
    }
    public MyException(String str) {
    
    
        super(str);
    }
}

Mytest

package com.ebaotech.demo;

import org.junit.Assert;
import org.junit.Before;
import org.junit.Test;
import org.junit.jupiter.api.function.Executable;

import static org.junit.jupiter.api.Assertions.assertThrows;

public class Mytest {
    
    
   private ParkingLot parkingLot;
   private Car car;
   private Car car1;
   private Voucher voucher;
   private Voucher voucher1;
    @Before
    public void init() throws MyException {
    
    
        parkingLot = new ParkingLot();
        car = new Car();
        car1 =new Car();
        voucher =new Voucher();
        voucher1 = parkingLot.saveCar(car);

    }
    //不能存
    @Test
    public void  showCanSave()  {
    
    
        assertThrows(MyException.class, new Executable() {
    
    
            @Override
            public void execute() throws Throwable {
    
    
                parkingLot.saveCar(car);
                parkingLot.saveCar(car1);
            }
        });

    }
    //能存能取
    @Test
    public void showCanNotSave() throws MyException {
    
    

        Assert.assertEquals(car,parkingLot.pickUpCar(voucher1));

    }

    // 不能取
    @Test
    public void ShowCanPickUp() throws MyException {
    
    
        Assert.assertEquals(car,parkingLot.pickUpCar(voucher));
    }
}