I got a Basic String Array
String[] array = {
"AAA",
"BBB",
"CCC"
};
Now I want to add a new Item to it
array[array.length + 1] = "DDD"
After I run my application it crashs.
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3The array length is fixed after creation. If you need to dynamically add elements try using a list. docs.oracle.com/javase/tutorial/java/nutsandbolts/arrays.htmlMike– Mike2014-08-22 12:43:55 +00:00Commented Aug 22, 2014 at 12:43
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3 Answers
An array is a container object that holds a fixed number of values of a single type. The length of an array is established when the array is created. After creation, its length is fixed.
If you want to change the size dynamically then you should use an ArrayList
or you could also use a HashMap
Comments
array[array.length + 1] = "DDD"
here assume array.length is 3 in your case its 3 cause you initialsed in such way so its 3 so when your trying to insert value in it you cant insert value in index which not in its bound so your upper limit index is its length-1 (cause index starts from 0)
because your trying to acess index which is out of bounds you will get ArrayIndexOutOfBounds exception thats why your getting crashes in your app hope it clears your issue
answered Aug 22, 2014 at 12:48
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You can use a ArrayList instead.
Just write
List<String> array = new ArrayList<String>();
array.add("AAA");
array.add("BBB");
array.add("CCC");
array.add("DDD");
