creating string arrays through for loop, in java

Question

I have a long Array, and for every long value i m using this query to fetch a string Array from sqlite database.

long[] mylong= {1,3,5,6,7};
Dbadapter finaldb = new Dbadapter(this);
for(int i=0; i<mylong.length; i++) {
        finaldb.open();
        String[] string_array = finaldb.getArray(mylong[i]);
        finaldb.close();

now, i want to store these different string arrays with some name so that i can use them after. but i don't know how to achieve this. If any one can guide me in the right direction?

Answer 1

You can have ArrayList<String[]> to store arrays and add those array to list and use get method to retrieve the array or you can use Map<key,value> to manage the key value based structure for retrieval of array.

FOR EXAMPLE

String str[]=new String[10];
str[0]="abc";
//and other values
List<String[]> list=new ArrayList<String[]>();
list.add(str);
//OR
Map<Long,String[]> map=new HashMap<Long,String[]>();
map.put(myLong[0],str);

Answer 2

Create a class that contains a long variable and a String array. Use this object collection to store the result.

See code snippet below

Class Result{
private long key;
private String[] value;


public Result(long key, String[] value){
this.key = key;
this value = value;
}

//getter setter goes here
}

modified code below

long[] mylong= {1,3,5,6,7};
List<Result> result = new ArrayList<Result>();
Dbadapter finaldb = new Dbadapter(this);
for(int i=0; i<mylong.length; i++) {
        finaldb.open();
        String[] string_array = finaldb.getArray(mylong[i]);
        result.add(new Result(mylong[i]),string_array ));
        finaldb.close();

You can use the List for further operations

Answer 3

I'm not sure if I really understand what you want to do, but it seems like you want to store the String[] db results in a Map using a String name.

Below I give an example how to do that. You can easily put this in a loop if you understand the concept. Hopefully this makes sense. I tried to match what you might actually be using.

String[] names = {"one", "two", "three", "four"};
String[] string_array = {"1.0", "2.1", "7.9"};
Map<String,String[]> storage = new HashMap<String,String[]>();

storage.put(names[0], string_array);