Adding more variables to an array of objects in java

Question

I've made a bit of a mess on a project of mine. I have to create an array of objects. I have made an array but it only has 1 field 'myMonths' referring to the length of time of the project. In my main method:

case 1:

    int n = 1;    //int n = number of projects
    Scanner sc = new Scanner(System.in);

    //myMonths = new int[amount];

    System.out.println("** Only projects with a duration between 2 and 12 months can be included **");
    System.out.println("What was the duration of your projects in months?");

    for(int i=0; i<1; i++){
        int a = sc.nextInt();

        //display error message
        if((a < 2) || (a > 12)){
            System.out.println(" Please enter an amount between 2 and 12 months. ");
        }

        //add to the array
        else{
            myMonths[index++] = a;
        }
    }

    calc.setMyMonths(myMonths); //creating the object
    break;

In my class on separate file:

public class MenuTestClass{

private int myMonths[];
private double average; //store average value of numbers
private boolean averageCanBeCalculated;
private int max; // store max number from array. to be calculated

public MenuTestClass(){
    myMonths = new int[5];
    }

 public MenuTestClass(int[] myMonths){
   this.myMonths = myMonths;
   }
 public void setMyMonths(int[] values){ //declare setter method
   myMonths = values;
   }

I should have added in two more fields, both strings. Is there a way I can add more fields/attributes to this array and have them viewable at the same time under 1 index? For example at [0] projectName, projectManager, myMonths ie(string, string, integer). Any advice would be great, I am getting really confused with OOP. Thanks in advance!

Thanks for editing the code! :)

Aleo111
– Aleo111

2022-04-09 15:23:50 +00:00
Commented Apr 9, 2022 at 15:23 — Aleo111
– Aleo111, Commented Apr 9, 2022 at 15:23

Johan Nordlinder · Accepted Answer · 2022-04-09 15:36:01Z

1

Yes, create a class containing your three properties:

class MyContainer {
    
    public MyContainer(int durationMonths, String projectName, String projectManager) {
        this.durationMonths = durationMonths;
        this.projectName = projectName;
        this.projetManager = projectManager;
    }

    public int durationMonths;
    public String projectName;
    public String projectManager;
}

Then create an array of this class with:

MyContainer[] myArray = new MyContainer[numberOfProjects];

Add items to the array like this:

myArray[0] = new MyContainer(3, "super project", "awesome manager");

edited Apr 9, 2022 at 15:36

answered Apr 9, 2022 at 15:21

Johan Nordlinder

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5 Comments

Hovercraft Full Of Eels Over a year ago

Syntax error. It should be: MyContainer[] myContainers = new MyContainer[];

Aleo111 Over a year ago

Thanks so much for the answer! Sorry I'm really confused with this stuff. Do I need to get rid of my array called myMonths[ ]?

Johan Nordlinder Over a year ago

Updated the example code, I'm writing this on mobile so I messed up with the array name as Hovercraft pointed out. Aleo111 you should replace it with the array of the objects that will hold your values.

Aleo111 Over a year ago

I'm just wondering if I'm declaring my array too many times. I've declared it in my main method as well as in my class file, am I doing this incorrectly? int myMonths[] = new int[amountOfProjects]; int index = 0; int num; while(choice !=6){ //while option 6 is not chosen keep showing the menu switch (choice){

Aleo111 Over a year ago

in the message above you can see how I've declared it in my main method, just before I go into switch statements

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