One of my method returns String[] array in a loop. While loop contiues, I want to add these String[] arrays to another String[] array. I want something like this given below. It gives ype mismatch: cannot convert from String[] to String error.
String[] searchResultList = new String[25];
int count = 0;
for (...) {
String[] resultList = getArray(parameter);
searchResultList[count] = resultList;
count++;
}
Well you've tried setting an element of a string array to be another string array. You can't do that.
Either you need to make your searchResultList an array of string arrays (String[][]) or you need to copy all the strings within resultList into searchResultList.
Whichever way you choose, you should probably consider using a List<String> instead of arrays... that way you don't need to hard code some arbitrary upper limit to the array size, as a list can grow.
Your problem is that you're trying to store a String[] - i.e. a String array, a number of Strings - in an array that stores String - i.e. just single Strings. You can put one bag inside another bag directly, you need to take the things out of the bag first.
So what you need to do is:
resultList array one by one to the searchResultList arraysearchResultList array to hold all the new valuesOr, a much better solution you could just use a List since they grow automatically and allow you to add multiple items at once:
List<String> searchResultList = new ArrayList<String>();
for (...) {
String[] resultList = getArray(parameter);
searchResultList.addAll(Arrays.asList(resultList));
}
Your searchResultList variable stores String elements but you try and add a String[] to it, so this is normal.
Why don't you make searchResultList an ArrayList<String>, and also getArray() return such an ArrayList as well? This way, all you'd have to do is searchResultList.add(getArray(parameter));
.toArray() operation, don't you?
U should use ArrayUtils.addAll(..) to add all elements from one array to another.
You say you have a requirement to use String[] rather than List. But nothing should stop you from using List internally in your method and returning an array, e.g.
List<String> searchResult = new ArrayList<String>();
for (?) {
String[] resultList = getArray(parameter);
searchResult.addAll(Arrays.asList(resultList));
}
return searchResult.toArray(new String[searchResult.size()]);
String[] resultList = getArray(parameter);
searchResultList[count] = resultList;
Here, resultList is array.. But searchResultList[count] is String.. So you r getting "cannot convert from String[] to String error." better u can use
String[] resultList = getArray(parameter);
searchResultList[count] = resultList[count];
.. use this.Now you can get with statement
Add String[] array to another String[] array
public static String[] addAll(String[] array1, String... array2) {
if (array1 == null) {
return array2;
} else if (array2 == null) {
return array1;
} else {
String[] joinedArray = new String[array1.length + array2.length];
System.arraycopy(array1, 0, joinedArray, 0, array1.length);
System.arraycopy(array2, 0, joinedArray, array1.length, array2.length);
return joinedArray;
}
}
In order to add an existing array of string to another array I use :
private ArrayList<String> concatArray(ArrayList<String> TabEvenHis) {
ArrayList<String> TabFin = new ArrayList<String>();
String sEven;
for (int i = 0; i < TabEvenHis.size(); i++) {
sEven = TabEvenHis.get(i);
TabFin.add(sEven);
}
return TabFin;
}
Call :
MyArrayExisting=concatArray(ArrayToAdd);
