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黑墨水鱼
2022-04-24 13:24:47 +08:00
parent 4a4c378b87
commit e20c82d559
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assignment5/Question3/Car.java Normal file
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/*
* Author: CHEN Yongyuan (Walter) 1930006025 from OOP(1007)
* Date: 2022-04-24
* Description: Car class
*/
public class Car extends Vehicle {
/**
* Car can not fly.
*
* @return false
*/
@Override
public boolean canFly() {
return false;
}
/**
* Constructor.
*
* @param speedLimit The speed limit of the car.
* @param speed the speed of the car.
* @thorws BadSpeedSetting if speedLimit or speed is negative. Or if the speed
* is greater than the speed limit.
*/
public Car(int speedLimit, int speed) throws BadSpeedSetting {
super(speedLimit, speed);
}
/**
* Constructor. Default speed limit is 120.
*
* @param speed the speed of the car.
* @thorws BadSpeedSetting if speed is negative. Or if the speed is greater than
* the speed limit 120.
*/
public Car(int speed) throws BadSpeedSetting {
this(120, speed);
}
/**
* Test.
*/
public static void testCar() {
try {
Car c1;
try {
c1 = new Car(-1, -1);
} catch (BadSpeedSetting e) {
System.out.println(e.getMessage().equals("Speed cannot be negative!"));
}
try {
c1 = new Car(120, -1);
} catch (BadSpeedSetting e) {
System.out.println(e.getMessage().equals("Speed cannot be negative!"));
}
try {
c1 = new Car(120, 121);
} catch (BadSpeedSetting e) {
System.out.println(e.getMessage().equals("Speed cannot be greater than speed limit!"));
}
c1 = new Car(120, 100);
System.out.println(c1.getSpeed() == 100);
System.out.println(c1.canFly() == false);
System.out.println(c1.accelerate(10) == 110);
System.out.println(c1.canFly() == false);
System.out.println(c1.accelerate(10) == 120);
System.out.println(c1.canFly() == false);
try {
c1.accelerate(10);
} catch (ExceedSpeedLimit e) {
System.out.println(e.getMessage().equals(
"Current speed is 120. Accelerate 10 will exceed the speed limit!"));
}
System.out.println(c1.accelerate(-20) == 100);
System.out.println(c1.canFly() == false);
System.out.println(c1.accelerate(-20) == 80);
System.out.println(c1.canFly() == false);
System.out.println(c1.accelerate(-20) == 60);
System.out.println(c1.canFly() == false);
System.out.println(c1.accelerate(-20) == 40);
System.out.println(c1.canFly() == false);
System.out.println(c1.accelerate(-20) == 20);
System.out.println(c1.canFly() == false);
System.out.println(c1.accelerate(-20) == 0);
System.out.println(c1.canFly() == false);
try {
c1.accelerate(-20);
} catch (NotEnoughSpeed e) {
System.out.println(e.getMessage()
.equals("Current speed is 0, not enough speed to decelerate!"));
}
Car c2 = new Car(100);
System.out.println(c2.getSpeed() == 100);
System.out.println(c2.canFly() == false);
System.out.println(c2.accelerate(10) == 110);
System.out.println(c2.canFly() == false);
System.out.println(c2.accelerate(10) == 120);
System.out.println(c2.canFly() == false);
try {
c2.accelerate(10);
} catch (ExceedSpeedLimit e) {
System.out.println(e.getMessage().equals(
"Current speed is 120. Accelerate 10 will exceed the speed limit!"));
}
System.out.println(c2.accelerate(-20) == 100);
System.out.println(c2.canFly() == false);
System.out.println(c2.accelerate(-20) == 80);
System.out.println(c2.canFly() == false);
System.out.println(c2.accelerate(-20) == 60);
System.out.println(c2.canFly() == false);
System.out.println(c2.accelerate(-20) == 40);
System.out.println(c2.canFly() == false);
System.out.println(c2.accelerate(-20) == 20);
System.out.println(c2.canFly() == false);
System.out.println(c2.accelerate(-20) == 0);
System.out.println(c2.canFly() == false);
try {
c2.accelerate(-20);
} catch (NotEnoughSpeed e) {
System.out.println(e.getMessage()
.equals("Current speed is 0, not enough speed to decelerate!"));
}
} catch (Exception e) {
System.out.println("Error uncatched exception: " + e.getMessage());
}
}
}