Question

The Tasks 1. The class Boat should be extended/modified to include the following: i. A static variable that is a count of the total number of Boat objects created. It should increase when each new boat is created (that is, in the both Boat constructors). ii. A static method called print Total which outputs the total number of boats created. For example, Total number of boats made = 2 iii. A sequence number of each boat should be stored (an instance variable) and returned with the other boat information as part of the Boat class's toString method. The sequence number is the value of the static count defined above (total number of boats) at the time the boat is created, For example, the boat below was created when the static count had a value of 2 (Sequence # = 2) Boat Harmony Blue, Class = International 505, #Crew = 1, Registration # = KA 6567, Sequence # = 2 2. Add statements to the main method to do the following: i. Invoke the print Total method at the start and end of the main method 3. Run the application. The following output should be produced: Starting Boat Application Total Number of Boats made = 0 Boat unknown, class = unknown, #Crew = 0, Registration # = KA -1, Sequence # = 1 Boat Harmony Blue, class = International 505, #Crew = 0, Registration # = KA 6467, Sequence # = 2 Boat Australia II, class=unknown, #Crew = 2, Registration # = KA -1, Sequence # = 1 Boat Harmony Blue, Class = International 505, #Crew = 1, Registration # = KA 6467, Sequence # = 2 Australia II Harmony Blue Total Number of Boats made = 2

GIVEN CODES

*****Boat.java*****

import java.util.HashSet;
import java.util.Set;

public class Boat {
    private String name; //private instance variable name of type String
    private String boatClass; //private instance variable boatClass of type String
    private int regNum; //private instance variable regNum of type int
    private Set<String> crew = new HashSet<String>();

    public void setName(String name) {
        this.name = name;
    }
    public void setBoastClass(String boatClass) {
        this.boatClass = boatClass;
    }
    public void setRegNum(int regNum) {
        this.regNum = regNum;
    }
    public String getName() {
        return name;
    }
    public String getBoatClass() {
        return boatClass;
    }
    public int getRegNum() {
        return regNum;
    }
    public Set<String> getCrew() {
        return crew;
    }
    public void addCrew(String crewName) {
        crew.add(crewName);
    }
    //Constructor for initializing the instance variables
    public Boat() {
        name = "unknown"; //initialize name to unknown
        boatClass = "unknown"; //initialize boatClass to unknown
        regNum = -1; //initialize regNum to -1
    }
    @Override
    public String toString() { //toString method for returning the boat object as String with no formal parameters
        return "Boat " + name + ", Class = " + boatClass + ", #Crew = " + crew.size() + ", Registration # = KA " + regNum; //concatenate the name class and regNum to return the String
    }

}

*******BoatMaker.java******

public class BoatMaker {
    public static void main(String[] args) {
        System.out.println("Starting boat application"); //print the message
        Boat myBoat = new Boat(); //defines a variable myBoat of type Boat initialized to a new Boat object
        System.out.println(myBoat); //print the value of myBoat which calls the toString method of Boat Class
        myBoat.setRegNum(6467);
        myBoat.setBoastClass("International 505");
        myBoat.setName("Harmony Blue");
        System.out.println(myBoat);

        Boat myBoat1 = new Boat();
        myBoat1.setName("Australia II");
        myBoat1.addCrew("Anne");
        myBoat1.addCrew("Bob");

        Boat myBoat2 = new Boat();
        myBoat2.setRegNum(6467);
        myBoat2.setBoastClass("International 505");
        myBoat2.setName("Harmony Blue");
        myBoat2.addCrew("Martha");

        System.out.println(myBoat1);
        System.out.println(myBoat2);

        System.out.println(myBoat1.getName());
        System.out.println(myBoat2.getName());

    }
}

Hi there, I need some help here, the task is add some codes to given code above,

I need to make output as bottom of the picture (nothing change with given code). Please add some explanation as well.

It's java and thank you very much.

Answer 1

BoatMaker.java Code:-

//(BoatMaker.java)
public class BoatMaker.java{
public static void main(String[] args) {
System.out.println("Starting boat application"); // print the message
Boat.printTotal();
Boat myBoat = new Boat(); // defines a variable myBoat of type Boat initialized to a new Boat object
System.out.println(myBoat); // print the value of myBoat which calls the toString method of Boat Class
myBoat.setRegNum(6467);
myBoat.setseqNum(2);
myBoat.setBoatClass("International 505");
myBoat.setName("Harmony Blue");
System.out.println(myBoat);
  
//creating object myBoat1.
Boat myBoat1 = new Boat();
//changing name of myBoat1 to Australia II.
myBoat1.setName("Australia II");
//Adding Anne and Bob to myBoat1.
myBoat1.addCrew("Anne");
myBoat1.addCrew("Bob");
  
//creating object myBoat2.
Boat myBoat2 = new Boat();
myBoat2.setRegNum(6467);
myBoat2.setseqNum(2);
myBoat2.setBoatClass("International 505");
myBoat2.setName("Harmony Blue");
//adding Martha to myBoat2.
myBoat2.addCrew("Martha");
  
//printing the value of myBoat1 and myBoat2.
System.out.println(myBoat1);
System.out.println(myBoat2);
  
//printing the names of myBoat1 and myBoat2.
System.out.println(myBoat1.getName());
System.out.println(myBoat2.getName());
Boat.printTotal();
}
}

Boat.java Code:-

//(Boat.java)

import java.util.HashSet;
import java.util.Set;

public class Boat {
private String name;// private instance variable name of type String
private String boatClass; // private instance variable boatClass of type String
private int regNum,seqNum; // private instance variable regNum of type int
//class variable to store number of objects created
private static int count=0;
// adding instance variable crew to store name of crew.
// using set as HashSet to store name by calculating the hash value
// of the name.
private Set<String> crew = new HashSet<String>();

//mutators or setters to set name,BoatClass and RegNum.
public void setName(String name) {
this.name = name;
}

public void setBoatClass(String boatClass) {
this.boatClass = boatClass;

}

public void setRegNum(int regNum) {
this.regNum = regNum;
count=count + 1;
}

public void setseqNum(int seqNum) {
this.seqNum = seqNum;
}
  
//Accessors or getters to get name,BoatClass and RegNum.
public String getName() {
return name;
}

public String getBoatClass() {
return boatClass;
}

public int getRegNum() {
return regNum;

}
public int getseqNum() {
return seqNum;

}

// return the Set crew.
public Set<String> getCrew() {
return crew;
}

// method to add crew name to Set crew.
public void addCrew(String crewName) {
crew.add(crewName);
}

// Constructor for initializing the instance variables
public Boat() {
seqNum = 1;
name = "unknown"; // initialize name to unknown
boatClass = "unknown"; // initialize boatClass to unknown
regNum = -1; // initialize regNum to -1


}

// modified the toString to include the crew tha display the size of set crew
// i.e. number of crew members.
@Override
public String toString() {

// toString method for returning the boat object asString with no formal
// parameters
return "Boat " + name + ", Class = " + boatClass + ", #Crew = " + crew.size() + ", Registration # = KA "
+ regNum + ", Sequence # = "+seqNum; // concatenate the name class
}
public static void printTotal()
{
System.out.println("Total number of boats made = "+count);
}
}

Output Screenshot:-

input Starting boat application Total number of boats made = 0 Boat unknown, class = unknown, #Crew = 0, Registration # = KA -1, Sequence # = 1 Boat Harmony Blue, Class = International 505, #Crew = 0, Registration # = KA 6467, Sequence # = 2 Boat Australia II, Class = unknown, #Crew = 2, Registration # = KA -1, Sequence # = 1, Boat Harmony Blue, Class = International 505, #Crew = 1, Registration # = KA 6467, Sequence # = 2 Australia II Harmony Blue Total number of boats made = 2 ...Program finished with exit code o Press ENTER to exit console. I

Note: Could you please consider my effort on this work and give up vote. Thank you :)