anyone knows how to specify array size?
public String[] videoNames = {""}
the array above can accomodate only one value. i want to extend how many values this array can accomodate.
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5 Answers
You should write it like this.
String[] videoNames = new String[5]; // create videoNames array with length = 5
for(int i=0;i<videoNames.length();i++)
{
// IMPORTANT : for each videoName, instantiate as new String.
videoNames[i] = new String("");
}
Comments
if you want dynamic size then use arraylist. something like:
public ArrayList<String> myList = new ArrayList<String>();
...
myList.add("blah");
...
for(int i = 0, l = myList.size(); i < l; i++) {
// do stuff with array items
Log.d("myapp", "item: " + myList.get(i));
}
Comments
Use ArrayList if you want to add elements dynamically. Array is static in nature.
How to add elements to array list
Thanks Deepak
answered May 30, 2011 at 10:53
Sunil Kumar Sahoo
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Comments
Use as:
public String[] videoNames = new String[SIZE]; // SIZE is an integer
or use ArrayList for resizable array implementation.
EDIT: and initialize it like this:
int len = videoNames.length();
for(int idx = 0; idx < len; idx++) {
videoNames[idx] = "";
}
With ArrayList:
ArrayList<String> videoNames = new ArrayList<String>();
// and insert
videoNames.add("my video");
answered May 30, 2011 at 10:44
Prince John Wesley
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3 Comments
Kris
Hi @John, thanks for your response. But how can I use an array list and how can I initialize an array properly coz when I initialize the array to null, my code returns nullPointerException... Sorry for the noob question
Kris
Is there a way to specify unlimited array size?
Prince John Wesley
@Kris: then use
ArrayList class.If you want to use an arraylist as written in your commnet here is an arraylist
ArrayList<String> videoNames =new ArrayList<String>();
add as many as you want no need to give size
videoNames.add("yourstring");
videoNames.add("yourstring");
videoNames.add("yourstring");
videoNames.add("yourstring");
to empty the list
videoNames.clear();
to get a string use
String a=videoNames.get(2);
2 is your string index
