Adding integers to an int array

Question

I am trying to add integers into an int array  but Eclipse says      cannot invoke add int  on the array type int     Which is completely illogical to me  I also tried  addElement   and addInt    however they don t work either   public static void main String   args        int   num   new int args length       for  String s   args           int neki   Integer parseInt s           num add neki

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org apache commons lang ArrayUtils can do this  num    int     ArrayUtils add num  12          builds new array with 12 appended

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An array doesn t have an add method  You assign a value to an element of the array with num i  value    public static void main String   args        int   num   new int args length       for  int i 0  i  lt  num length  i           int neki   Integer parseInt args i          num i  neki

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Arrays are different than ArrayLists  on which you could call add   You ll need an index first   Declare i before the for loop   Then you can use an array access expression to assign the element to the array     num i    s  i

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you have an array of int which is a primitive type  primitive type doesn t have the method add  You should look for Collections

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You cannot use the add method on an array in Java    To add things to the array do it like this  public static void main String   args    int   num   new int args length   for  int i   0  i  lt  args length  i         int neki   Integer parseInt s       num i    neki       If you really want to use an add   method  then consider using an ArrayList lt Integer gt  instead  This has several advantages - for instance it isn t restricted to a maximum size set upon creation  You can keep adding elements indefinitely  However it isn t quite as fast as an array  so if you really want performance stick with the array  Also it requires you to use Integer object instead of primitive int types  which can cause problems    ArrayList Example  public static void main String   args        ArrayList lt Integer gt  num   new ArrayList lt Integer gt         for  String s   args           Integer neki   new Integer Integer parseInt s            num add s

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An array has a fixed length  You cannot  add  to it  You define at the start how long it will be   int   num   new int 5     This creates an array of integers which has 5  buckets   Each bucket contains 1 integer  To begin with these will all be 0   num 0    1  num 1    2    The two lines above set the first and second values of the array to 1 and 2  Now your array looks like this    1 2 0 0 0    As you can see you set values in it  you don t add them to the end   If you want to be able to create a list of numbers which you add to  you should use ArrayList

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To add an element to an array you need to use the format   array index    element    Where array is the array you declared  index is the position where the element will be stored  and element is the item you want to store in the array   In your code  you d want to do something like this   int   num   new int args length   for  int i   0  i  lt  args length  i          int neki   Integer parseInt args i        num i    neki      The add   method is available for Collections like List and Set  You could use it if you were using an ArrayList  see the documentation   for example   List lt Integer gt  num   new ArrayList lt  gt     for  String s   args        int neki   Integer parseInt s       num add neki

[java] Adding integers to an int array

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