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ldy
2026-03-01 23:18:55 -05:00
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91
PastAssignments/Assignment5/Assignment5_2230026071/Question4/src/AirCraft.java Normal file
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public class AirCraft extends Vehicle{
//private instance
private int altitude;
//constructor
public AirCraft(int speedLimit, int speed, int altitude) throws BadSpeedSetting, BadAltitudeSetting {
super(speedLimit, speed);
if(altitude > 0)
this.altitude = altitude;
else
throw new BadAltitudeSetting();
}
//methods
public int getAltitude() {return this.altitude;}
@Override
public boolean canFly() {return true;}
//test
public static void testAirCraft() {
// test case for constructors
try {
// Exception
AirCraft a1 = new AirCraft(70,80,1000);
} catch (BadSpeedSetting e) {
System.out.println(e.getMessage().equals("Speed cannot be greater than speed limit!"));
} catch (BadAltitudeSetting e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
}
try {
// exception
AirCraft a2 = new AirCraft(70,-10,1000);
} catch (BadSpeedSetting e) {
System.out.println(e.getMessage().equals("Speed cannot be negative!"));
} catch (BadAltitudeSetting e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
}
try {
// exception
AirCraft a3 = new AirCraft(700,200,-10);
} catch (BadSpeedSetting e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
} catch (BadAltitudeSetting e)
{ System.out.println(e.getMessage().equals("Altitude cannot be negative!"));
}
// Test case for accelerate, canFly, getSpeed and getAltitude methods
try {
AirCraft a4 = new AirCraft(700,200,100);
// test the getAltitude method
System.out.println(a4.getAltitude()==100);
// test the canFly method
System.out.println(a4.canFly() == true);
a4.accelerate(100);
System.out.println(a4.getSpeed() == 300);
// test the accelerate with positive amount
a4.accelerate(-200);
System.out.println(a4.getSpeed() == 100);
// test the accelerate with negative amount
// exception
a4.accelerate(650);
} catch(BadSpeedSetting e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
} catch (BadAltitudeSetting e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
} catch (ExceedSpeedLimit e) {
System.out.println(e.getMessage().equals("Current speed is 100. Accelerate 650 will exceed the speed limit!"));
} catch (NotEnoughSpeed e) {
}
catch (TrainSpeedChange e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
}
try {
AirCraft a5 = new AirCraft(700,200,100);
// exception
a5.accelerate(-300);
} catch(BadSpeedSetting e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
} catch (BadAltitudeSetting e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
} catch (ExceedSpeedLimit e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
} catch (NotEnoughSpeed e) {
System.out.println(e.getMessage().equals("Current speed is "+ 200 + ", not enough speed to decelerate!"));
}
catch (TrainSpeedChange e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
}
}
}

6
PastAssignments/Assignment5/Assignment5_2230026071/Question4/src/BadAltitudeSetting.java Normal file
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public class BadAltitudeSetting extends Exception {
public BadAltitudeSetting() {
super("Altitude cannot be negative!");
}
}

6
PastAssignments/Assignment5/Assignment5_2230026071/Question4/src/BadSpeedSetting.java Normal file
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public class BadSpeedSetting extends Exception {
public BadSpeedSetting(String msg) {
super(msg);
}
}

69
PastAssignments/Assignment5/Assignment5_2230026071/Question4/src/Car.java Normal file
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public class Car extends Vehicle{
//constructors
public Car(int speedLimit, int speed) throws BadSpeedSetting {
super(speedLimit, speed);
}
public Car(int speed) throws BadSpeedSetting {
super(120, speed);
}
//method
@Override
public boolean canFly() {return false;}
//test
public static void testCar() {
// test case for constructors
try {
// exception
Car c1 = new Car(70,80);
} catch (BadSpeedSetting e) {
System.out.println(e.getMessage().equals("Speed cannot be greater than speed limit!"));
}
try {
// exception
Car c2 = new Car(70,-10);
} catch (BadSpeedSetting e) {
System.out.println(e.getMessage().equals("Speed cannot be negative!"));
}
// test case for accelerate, canFly and getSpeed methods
try {
Car c3 = new Car(100,80);
// test the canFly method
System.out.println(c3.canFly() == false);
c3.accelerate(10);
System.out.println(c3.getSpeed() == 90);
// test the accelerate with positive amount
c3.accelerate(-20);
System.out.println(c3.getSpeed() == 70);
// test the accelerate with negative amount
c3.accelerate(35); // exception
} catch(BadSpeedSetting e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
} catch (ExceedSpeedLimit e) {
System.out.println(e.getMessage().equals("Current speed is 70. Accelerate 35 will exceed the speed limit!"));
} catch (NotEnoughSpeed e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
}
catch (TrainSpeedChange e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
}
try {
Car c4 = new Car(100,80);
// exception
c4.accelerate(-90);
} catch(BadSpeedSetting e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
} catch (ExceedSpeedLimit e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
} catch (NotEnoughSpeed e) {
System.out.println(e.getMessage().equals("Current speed is "+ 80 + ", not enough speed to decelerate!"));
}
catch (TrainSpeedChange e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
}
}
}

6
PastAssignments/Assignment5/Assignment5_2230026071/Question4/src/ExceedSpeedLimit.java Normal file
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public class ExceedSpeedLimit extends Exception {
public ExceedSpeedLimit(int speed, int amount) {
super("Current speed is "+ speed +". Accelerate "+ amount +" will exceed the speed limit!");
}
}

4
PastAssignments/Assignment5/Assignment5_2230026071/Question4/src/Movable.java Normal file
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public interface Movable {
public int accelerate(int amount) throws Exception;
}

6
PastAssignments/Assignment5/Assignment5_2230026071/Question4/src/NotEnoughSpeed.java Normal file
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public class NotEnoughSpeed extends Exception {
public NotEnoughSpeed(int speed) {
super("Current speed is "+ speed + ", not enough speed to decelerate!");
}
}

11
PastAssignments/Assignment5/Assignment5_2230026071/Question4/src/Start.java Normal file
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public class Start {
public static void main(String[] args) {
Vehicle.testVehicle();
Car.testCar();
AirCraft.testAirCraft();
Train.testTrain();
}
}

50
PastAssignments/Assignment5/Assignment5_2230026071/Question4/src/Train.java Normal file
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public class Train extends Vehicle{
//constructor
public Train(int speedLimit, int speed) throws BadSpeedSetting {
super(speedLimit, speed);
}
//method
@Override
public int accelerate(int amount) throws TrainSpeedChange {
//if called accelerate() in Train
throw new TrainSpeedChange();
}
@Override
public boolean canFly() {return false;}
//test
public static void testTrain() {
// test case for constructors
try {
// exception
Train t1 = new Train(350,400);
} catch (BadSpeedSetting e) {
System.out.println(e.getMessage().equals("Speed cannot be greater than speed limit!"));
}
try {
// exception
Train t2 = new Train(350,-100);
} catch (BadSpeedSetting e) {
System.out.println(e.getMessage().equals("Speed cannot be negative!"));
}
// test case for accelerate, canFly and getSpeed methods
try {
Train t3 = new Train(350,300);
// test the canFly method
System.out.println(t3.canFly() == false);
// test the getSpeed
System.out.println(t3.getSpeed() == 300);
// exception
t3.accelerate(50);
} catch(BadSpeedSetting e) {
System.out.println("BUG! THIS MUST NEVER HAPPEN!");
} catch (TrainSpeedChange e) {
System.out.println(e.getMessage().equals("Do not try to accelerate or decelerate the train!"));
}
}
}

6
PastAssignments/Assignment5/Assignment5_2230026071/Question4/src/TrainSpeedChange.java Normal file
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public class TrainSpeedChange extends Exception {
public TrainSpeedChange() {
super("Do not try to accelerate or decelerate the train!");
}
}

42
PastAssignments/Assignment5/Assignment5_2230026071/Question4/src/Vehicle.java Normal file
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public abstract class Vehicle implements Movable{
//instance variables
private int speedLimit;
private int speed;
//constructor
public Vehicle(int speedLimit, int speed) throws BadSpeedSetting{
if(speedLimit >= 0 && speed >= 0) {
if(speed <= speedLimit) {
this.speedLimit = speedLimit;
this.speed = speed;
}
else throw new BadSpeedSetting("Speed cannot be greater than speed limit!");
}
else throw new BadSpeedSetting("Speed cannot be negative!");
}
//methods
public int accelerate(int amount) throws ExceedSpeedLimit, NotEnoughSpeed, TrainSpeedChange {
int tmp = this.speed + amount;
if(tmp >= 0 && tmp <= this.speedLimit) {
this.speed = tmp;
return this.speed;
}
else {
if(tmp < 0)
throw new NotEnoughSpeed(speed);
else
throw new ExceedSpeedLimit(speed, amount);
}
}
public int getSpeed() {return this.speed;}
public abstract boolean canFly();
//test
public static void testVehicle() {
//The Vehicle class is abstract. We cannot create objects from this class. Therefore we cannot test anything.
}
}