How to store String output to an array in Java [duplicate]

To store the data you can do several things:

• Use a String Array, if you know the number of items.
• Use a String ArrayList, if you dont know the number of items.

If you are using the array, the declare the String array,

String arr[]=new String[numberOfItems];

and then every time you are iterating the loop write:

arr[position++]=c.getString(position);

Now if you are using Array List then Declare the Array List:

ArrayList<String> list=new ArrayList<String>();

and then every time you iterate through the loop:

list.add(c.getString(position));

After this to get the elements you can write a foreach loop.

for(String ele: list){
   Toast.makeText(context,ele,Toast.LENGTH_SORT).show();
}

Use ArrayList. They are dynamic i.e. needs no initial length. Use the ArrayList.add() method to add elements to the ArrayList and use ArrayList.toArray() to get an array if you need one. More information from the official docs here.

Create one global variable like,

ArrayList<String> list = new ArrayList<String>();

Inside your loop, you can add this code,

list.add(c.getString(0));

later you can convert it into array using list.toArray() method.

If you want to store the String value by character wise then use toCharArray() method.

You can use below code:

List<String> globalList = new ArrayList<String>();
private void showList() {

DataBaseHelper db = new DataBaseHelper(this);
    db.open();
c = db.retriveall();
if (c.moveToFirst()) {
    do {
        Toast.makeText(MainActivity.this,
                "_id: " + c.getString(0) + "\n",
                Toast.LENGTH_LONG).show();
        globalList.add(c.getString(0)) ;
    } while (c.moveToNext());
}

String [] a = globalList.toArray(new String[globalList.size()]);

}