Creating New Arrays

Question

My goal is simple. I'd like to be able to take user input from 4 edittext fields, with ids of et1-4, and put them into an array named aSummary1[] = {et1, et2, et3, et4};. The four fields are different data types, two being words, one numbers, and one a password. This will all be displayed in a ListView. This part I can do. The part I can't figure out is if I want to add a new row in the ListView, I'd like to create a new string array, let's say aSummary2[] with different values, but the same parameters: {word, word, number, password};, then aSummary3[] and so on and so forth.

How would one go about doing this? Or if there is a better way, how would I assign variables and strings to list entries with no limit. For instance, with list entry x comes variables w y and z assigned to x, but with variable a comes b c and e, and with q comes r s and t.

Why Array? Why not object of a class?

nhahtdh
– nhahtdh

2012-09-02 12:14:31 +00:00
Commented Sep 2, 2012 at 12:14 — nhahtdh
– nhahtdh, Commented Sep 2, 2012 at 12:14

Kumar Vivek Mitra · Accepted Answer · 2012-09-02 13:04:58Z

I think you need a growing array..... Better go with Collections, its more flexible, and unlike arrays, you don't initialize it at the time of its declaration.

First Consider making a Pojo

public class Summary {

    private String str1;
    private String str2;
    private int number;
    private String password;



    public Summary(String str1, String str2, int number, String password) {

        this.str1 = str1;
        this.str2 = str2;
        this.number = number;
        this.password = password;
    }

    public String getStr1() {
        return str1;
    }

    public String getStr2() {
        return str2;
    }

    public int getNumber() {
        return number;
    }

    public String getPassword() {
        return password;
    }


}



 }

Now consider another class from where you initialize this class object and store then in an ArrayList.

public class Test{

public static ArrayList<Summary> arList = new ArrayList<Summary>();
private Summary sObj;

   public void fillMe(String p1, String p2, int p3, String p4){


           arList.add(new sObj(p1, p2, p3, p4));
    }
}

Egor · Accepted Answer · 2012-09-02 12:35:44Z

1

As was mentioned in the comments, the better solution will be to create a class containing all required fields, for example:

public class Summary {
    private String field1;
    private String field2;
    private String field3;
    private String field4;
}

And then store objects of this class inside an ArrayList:

ArrayList<Summary> summaries = new ArrayList<Summary>();

When you need to create another object of this type, just call:

Summary summary = new Summary();
// initialize fields
summaries.add(summary);

Hope this helps.

answered Sep 2, 2012 at 12:35

Egor

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4 Comments

Adam Over a year ago

When I want to call a specific variable from a specific location, eg. aSummary1[0] or aSummary14[3], how would I do that?

Egor Over a year ago

@Adam, Just call summaries.get(position)

Adam Over a year ago

The position would increase by 4 every time. The password would be at summaries.get(3) for the first password, but the second would be summaries.get(7). The twelfth password would be at summaries.get(47).

Egor Over a year ago

@Adam, You're not right. Password should be just a field of a Summary object, means to get first password you should get first item of summaries and retrieve its password.

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