Develop Reference

using loop variables with object variables

This is what i got
Constructor:
public class Assignment08_ {
String name;
String abrv;
int atomicNumber;
double atomicMass;
int group;
int period;
public Assignment08_(String name, String abrv, int atomicNumber, double
atomicMass, int group, int period) {
this.name = name;
this.abrv = abrv;
this.atomicNumber = atomicNumber;
this.atomicMass = atomicMass;
this.group = group;
this.period = period;
}
}
And the Class:
import java.io.File;
import java.util.Scanner;
public class Assignment08 {
public static void main(String[] args) throws Exception {
Assignment08_[] elementArr = new Assignment08_[119];
reader(elementArr);
for(int i = 0; i < args.length; i++) {
action(elementArr, args[i]);
}
}
public static void reader(Assignment08_[] elements) throws Exception {
Scanner data = new Scanner(new File("/srv/datasets/elements"));
while (data.hasNext()) {
int atomicNumber = data.nextInt();
String abrv = data.next();
String name = data.next();
double atomicMass = data.nextDouble();
int period = data.nextInt();
int group = data.nextInt();
elements[atomicNumber] = new Assignment08_(name, abrv, atomicNumber,
atomicMass, group, period);
}
data.close();
}
public static void action(Assignment08_[] element, String str) {
// for testing
System.out.printf("%s%n", element[4].abrv);
for (int i = 0; i < 119; i++) {
if (str.compareTo(element[i].abrv) == 0)
System.out.println(element[i].name);
}
}
}
i input "java Assignment08_ H" (which is equal to element[0].abrv)
i get the output:
"
Be
Exception in thread "main" java.lang.NullPointerException
at Assignment08.action(Assignment08.java:33)\
at Assignment08.main(Assignment08.java:11)
"
Be = element[4].abrv
and its wierd because if i were to take away that for statement and leave only the nested if statement and change the i to a Number (like 0), it will print the name and run properly( if i input H which equals element[0].abrv), soooo i dont know what going on here, any help would be great, thx

Issue recalling method. unsure of where im going wrong

Below is my code and I have notes beside where my errors are showing. Im unsure where I am going wrong when recalling my method or if that is even the issue.
import java.util.Scanner;
public class HurlerUse
{
static Hurler[] hurlerArray;
// find lowest score (static method)
public static int findLow(Hurler[] hurlerArray)
{
for(int i = 0; i < hurlerArray.length; i++)
{
int lowest = 0;
int index = 0;
for(int j=0; j<hurlerArray.length; j++)
{
int current = hurlerArray[i].totalPoints();// issue with my method 'totalPoints'
if(current < lowest)
{
lowest = current;
index = i;
}
}
return index;
}
}
//main code
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
Hurler[] hurlerArray = new Hurler[5];
for (int i = 0; i <4; i++)
{
hurlerArray[i] = new Hurler();
System.out.println ("Enter Hurler Name:");
hurlerArray[i].setName(sc.nextLine());
hurlerArray[i].setGoalsScored(sc.nextInt());
System.out.println("Enter the hurler's goals scored");
hurlerArray[i].setPointsScored(sc.nextInt());
System.out.println("Enter the hurler's points scored");
}
for(int i=0;i< hurlerArray.length; i++)
{
hurlerArray[i] = new Hurler(MyName, MyGoalsScored, MyPointsScored);// issue with all 3 objects in the brackets but im unsure of how to fix them
}
System.out.println("The lowest scoring hurler was " + hurlerArray[findLow(hurlerArray)].getName());// error with my code here I think it is in the method
}
}//end of class
I know the nyName, myGoalsScored, myPointsScored is incorrect but can anyone explain why?
This is the class page that accompanies it
public class Hurler
{
private String name;
private int goalsScored;
private int pointsScored;
public Hurler() //constructor default
{
name ="";
goalsScored = 0;
pointsScored = 0;
}
public Hurler(String myName, int myGoalsScored, int myPointsScored) // specific constructor
{
name = myName;
goalsScored = myGoalsScored;
pointsScored = myPointsScored;
}
//get and set name
public String getMyName()
{
return name;
}
public void setName(String myName)
{
name = myName;
}
//get and set goals scored
public int getGoalsScored()
{
return goalsScored;
}
public void setGoalsScored(int myGoalsScored)
{
goalsScored = myGoalsScored;
}
// get and set points scored
public int getPointsScored()
{
return pointsScored;
}
public void setPointsScored(int myPointsScored)
{
pointsScored = myPointsScored;
}
public int totalPoints(int myGoalsScored, int myPointsScored)
{
int oneGoal = 3;
int onePoint = 1;
int totalPoints = ((goalsScored * oneGoal) + (pointsScored * onePoint));
{
return totalPoints;
}
}
}//end of class

You call totalPoints() without parameters while method totalPoints(int, int) in Hurler class expects two int parameters.
Objects MyName, MyGoalsScored, MyPointsScored are not declared at all.
You call getName() method, while in Hurler class you do not have one. There is method getMyName(), maybe you want to call that one.

Java Class - main not compiling when i read to departments

I wrote the two departments and when I try to read to the class from the chief and I have a problem compiling and I can not understand what the problem is, I'd love to help.
in main the error is on the line : 5.
Main:
public class main {
public static void main(String[]args){
Lecturer LecturerObject = new Lecturer("Dani",3,"Banana",1001);
The error is here >>Lecturer[] L1 = new Lecturer("Dani",2,"Banana",1001);
College FirstCollege = new College("Hmpson",2, L1);
}
}
First Class:
public class Lecturer {
public String nameOfLecturer = "";
public int numOfTimesPenFalls = 0;
public String favoriteIceCream = "";
public int numAuto = 1000;
//constructors, same name like class
public Lecturer(String name, int TimesPenFalls, String IceCream,
int num) {
nameOfLecturer = name;
numOfTimesPenFalls = TimesPenFalls;
favoriteIceCream = IceCream;
numAuto = num;
int maxLecturer=10;
}
//Copy constructor
public Lecturer(Lecturer other){
nameOfLecturer = other.nameOfLecturer;
numOfTimesPenFalls = other.numOfTimesPenFalls;
favoriteIceCream = other.favoriteIceCream;
numAuto = other.numAuto;
}
}
Secoand Class:
public class College {
public String CollegeName = "";
public int numOfLecturers = 0;
public Lecturer[] allLecturers;
// constructors, same name like class
public College(String name, int numLecturers, Lecturer[] dataBase) {
CollegeName = name;
numOfLecturers = numLecturers;
allLecturers = dataBase;
int maxLecturer = 10;
}
// getter, only private
public String getCollegeName() {
return CollegeName;
}
// setter, only private
public void setCollegeName(String newcollegeName) {
CollegeName = newcollegeName;
}
public boolean newLecturer(Lecturer addNewLecturer, int maxLecturer) {
if (numOfLecturers < maxLecturer || numOfLecturers == maxLecturer) {
numOfLecturers += 1;
return true;
} else {
System.out.print("Sorry, Max Lecturer!");
return false;
}
}
public void sortLecturer(Lecturer[] arrAllLecturers) {
int numOfTimesPenFalls = 0;
}
}
I'm first started with java I would be happy for a detailed explanation where is the problem, thank you very much.

This statement here
Lecturer[] L1 = new Lecturer("Dani",2,"Banana",1001); is wrong because you have defined L1 as an array but you are initializing it as a simple Object....
in some IDEs like eclipse, the compiler will complain with a message like
Type mismatch: cannot convert from Lecturer to Lecturer[]
Ergo: you need to init L1 as it is, as an array:
do this:
Lecturer[] L1 = new Lecturer[]{new Lecturer("Dani",2,"Banana",1001)};
now you have an array with one Lecturer object inside..

You are trying to assign array Lecture object to array, which can be done in following manner correctly.
Lecturer[] L1 = new Lecturer[] {new Lecturer("Dani",2,"Banana",1001)};

Java testing out a driver class

I've been having some issues with this program. I have to test out using a driver class each method, but I can't seem to understand what I should do when the parameters are strings.
I had an example for int parameters but the example never showed anything on string parameters and how to convert. Using null makes my driver class run but putting an int or string won't.
What can I do to convert this correctly, so it can display whatever I have in the no parameter constructor?
public class StudentListing
{
private String name;
private String number;
public StudentListing(String n, String num)
{
name = n;
number = num;
}
public StudentListing()
{
name = null;
number = null;
}
public String toString()
{
return("Name is " + name +
"\nNumber is " + number + "\n");
}
public void show()
{
System.out.println(toString());
}
public StudentListing Clone()
{
StudentListing clone = new StudentListing (name, number);
return clone;
}
public int compareTo(String targetKey)
{
return (name.compareTo(targetKey));
}
public void input()
{
name = JOptionPane.showInputDialog("Enter a name");
number = JOptionPane.showInputDialog("Enter a number");
}// end of StudentListing
}//end of class
public class StudentListingDriver
{
public static void main(String[] args)
{
StudentListing s1 = new StudentListing();
StudentListing s2 = new StudentListing(null,null);
System.out.println(s1);
s1.input();
StudentListing s3 = s2.clone();
s1.show();
}
}

You can have default values and make the no-args constructor call the other constructor.
Use Integer.parseInt(); to convert from a String to an Integer.
You also need to check the conversion for exceptions.
Like this:
public class StudentListing {
private String name;
private int number;
public StudentListing(String n, int num) {
name = n;
number = num;
}
public StudentListing() {
this("defaultName", 0);
}
public String toString() {
return ("Name is " + name + "\nNumber is " + number + "\n");
}
public void show() {
System.out.println(toString());
}
public StudentListing Clone() {
StudentListing clone = new StudentListing(name, number);
return clone;
}
public int compareTo(String targetKey) {
return (name.compareTo(targetKey));
}
public void input() {
name = JOptionPane.showInputDialog("Enter a name");
number = Integer
.parseInt(JOptionPane.showInputDialog("Enter a number"));
}
}
The tester:
public class StudentListingDriver {
public static void main(String[] args) {
StudentListing s1 = new StudentListing();
StudentListing s2 = new StudentListing(null, 0);
System.out.println(s1);
s1.input();
StudentListing s3 = s2.Clone();
s1.show();
}
}

Calculate total from array

Two questions:
1. How do I create a method called getTotal() that traverses through the array and counts the total of the votes for all Candidates?
2. Where and how to create the method printResults() , that should transverse through the array and creates a table with columns for Candidate name, followed by votes received, and then percentage of total votes
Candidate
public class Candidate
{
// instance variables
private int numVotes;
private String name;
/**
* Constructor for objects of class InventoryItem
*/
public Candidate(String n, int v)
{
// initialise instance variables
name = n;
numVotes = v;
}
public int votes()
{
return numVotes;
}
public void setVotes(int num)
{
numVotes = num;
}
public String getName()
{
return name;
}
public void setName(String n)
{
name = n;
}
public String toString()
{
return name + " received " + numVotes + " votes.";
}
public int getTotal(Candidate[] election)
{
}
}
TestCandidate
public class TestCandidate
{
public static void printVotes(Candidate[] election)
{
for(int i = 0; i < election.length; i++)
System.out.println(election[i]);
}
public int getTotal(Candidate[] election)
{
int total = 0;
for(Candidate candidate : election )
{
total += candidate.numVotes;
}
return total;
}
public static void main(String[] args)
{
Candidate[] election = new Candidate[5];
// create election
election[0] = new Candidate("John Smith", 5000);
election[1] = new Candidate("Mary Miller", 4000);
election[2] = new Candidate("Michael Duffy", 6000);
election[3] = new Candidate("Tim Robinson", 2500);
election[4] = new Candidate("Joe Ashtony", 1800);
System.out.println(" Results per candidate ");
System.out.println("______________________________");
System.out.println();
printVotes(election);
System.out.println("The total of votes in election: " + getTotal() );
}
}

public int getTotal(Candidate[] election)
{
int total = 0;
for( Candidate candidate : election ) {
total += candidate.votes();
}
return total;
}
This method and printResults() method in my opinion should go to some wrapper class that gathers all Candidates. For example like this:
class CandidatesList {
private Candidate[] candidates;
public CandidatesList(Candidate[] candidates) {
this.candidates = candidates;
}
public int getTotal()
{
int total = 0;
for( Candidate candidate : candidates) {
total += candidate.votes();
}
return total;
}
public String toString() {
StringBuilder builder = new StringBuilder();
int total = getTotal();
for( Candidate candidate : candidates) {
builder.append( String.format( "%20s | %5d | %.2f %%\n",
candidate.getName(), candidate.votes(), candidate.votes() / total );
}
return builder.toString();
}
}
You can use it like this:
CandidatesList list = new CandidatesList(election);
System.out.print(list);
System.out.format("Total votes: %d\n", list.getTotal());