/Create a New Java Project . //Design a Ship class that has the following member
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Question
/Create a New Java Project
. //Design a Ship class that has the following members: //A field for the name of the ship (a string). //A field for the year that the ship was built (a string). //A constructor and appropriate accessors and mutators. //A toString method that displays the ship's name and the year it was built.
Design a CruiseShip class that extends the Ship class. The CruiseShip class should have the following members: A field for the maximum number of passengers (an int). A constructor and appropriate accessors and mutators. A toString method that overrides the toString method in the base class. The CruiseShip class's toString method should display only the ship's name and the maximum number of passengers.
Design a CargoShip class that extends the Ship class. The CargoShip class should have the following members: A field for the cargo capacity in tonnage (an int). A constructor and appropriate accessors and mutators. A toString method that overrides the toString method in the base class. The CargoShip class's toString method should display only the ship's name and the ship's cargo capacity.
Demonstrate the classes in a program that has a Ship array. Assign various Ship, CruiseShip, and CargoShip objects to the array elements. The program should then step through the array, calling each object's toString method.
Explanation / Answer
/*Ship.java*/
public class Ship {
String ship;
int year;
//construtor for name and year
public Ship(String ship,int year)
{
this.ship=ship;
this.year=year;
}
//get methods
public String getShipName()
{
return ship;
}
public int getYear()
{
return year;
}
//Override toString method
public String toString()
{
return "Ship Name :"+getShipName()+
" Built Year :"+getYear();
}
}
/*CruiseShip.java*/
public class CruiseShip extends Ship{
int maxPassengers;
//construtor for name and number of passengers
public CruiseShip(String ship,
int year,int maxPassengers)
{
super(ship,year);
this.maxPassengers=maxPassengers;
}
//return maximum passengers
public int getMaxPassengers()
{
return maxPassengers;
}
//Overiride the toString
public String toString()
{
return " Ship Name :"+getShipName()+
" Maximum Number of passengers :"+
getMaxPassengers();
}
}
/*CargoShip.java*/
public class CargoShip extends Ship{
int noOfTonns;
// construtor for name and year ,number of tonns
public CargoShip(String name,int year,int noOfTonns)
{
super(name,year);
this.noOfTonns=noOfTonns;
}
//return number of tonns
public int getNoOfTonns()
{
return noOfTonns;
}
public String toString()
{
return " Ship name :"+getShipName()+
" Ship Capacity :"+getNoOfTonns();
}
}
/*ShipDemo*/
public class ShipDemo {
public static void main(String[] args) {
//create an array of type ship of size
Ship[] ships=new Ship[3];
//initialize constructors
ships[0]=new Ship("Sea-Hawk",2002);
ships[1]=new CruiseShip("Titanic",2002,1336);
ships[2]=new CargoShip("Sharp-Teeth",2002,100);
//print toString methods
for(int i=0;i<ships.length;i++)
System.out.println(ships[i].toString());
}
}
Compile and run the program:
javac ShipDemo.java
java ShipDemo
Output:
Ship Name :Sea-Hawk
Built Year :2002
Ship Name :Titanic
Maximum Number of passengers :1336
Ship name :Sharp-Teeth
Ship Capacity :100
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