Adding Multiple Values in ArrayList at a single index

Question

I have a double ArrayList in java like this   List lt double   gt  values   new ArrayList lt double   gt  2     Now what I want to do is to add 5 values in zero index of list and 5 values in index one through looping   The zeroth index would have values  100 100 100 100 100  The index 1 would have values  50 35 25 45 65   and all of these values are stored in a double array in following order  double   values    100 50 100 35 100 25 100 45 100 65    How can i do it

User · Accepted Answer

Ahamed has a point  but if you re insisting on using lists so you can have three arraylist like this   ArrayList lt Integer gt  first   new ArrayList lt Integer gt  Arrays AsList 100 100 100 100 100    ArrayList lt Integer gt  second   new ArrayList lt Integer gt  Arrays AsList 50 35 25 45 65    ArrayList lt Integer gt  third   new ArrayList lt Integer gt      for int i   0  i  lt  first size    i            third add first get i          third add second get i        Edit  If you have those values on your list that below   List lt double   gt  values   new ArrayList lt double   gt  2     what you want to do is combine them  right  You can try something like this   I assume that both array are same sized  otherwise you need to use two for statement   ArrayList lt Double gt  yourArray   new ArrayList lt Double gt     for int i   0  i  lt  values get 0  length  i          yourArray add values get 0  i        yourArray add values get 1  i

User · Answer

Use two dimensional array instead  For instance  int values       new int 2  5   Arrays are faster  when you are not manipulating much

User · Answer

import java util    public class HelloWorld    public static void main String   args     List lt String gt  threadSafeList   new ArrayList lt String gt         threadSafeList add  A        threadSafeList add  D        threadSafeList add  F     Set lt String gt  threadSafeList1   new TreeSet lt String gt         threadSafeList1 add  B        threadSafeList1 add  C        threadSafeList1 add  E        threadSafeList1 addAll threadSafeList      List mainList   new ArrayList        mainList addAll Arrays asList threadSafeList1     Iterator lt String gt  mainList1   mainList iterator     while mainList1 hasNext      System out printf  total    s  n   mainList1 next

User · Answer

ArrayList lt ArrayList gt  arrObjList   new ArrayList lt ArrayList gt     ArrayList lt Double gt  arrObjInner1  new ArrayList lt Double gt     arrObjInner1 add 100   arrObjInner1 add 100   arrObjInner1 add 100   arrObjInner1 add 100    arrObjList add arrObjInner1     You can have as many ArrayList inside the arrObjList  I hope this will help you

User · Answer

You can pass an object which is refering to all the values at a particular index   import java util ArrayList   public class HelloWorld    public static void main String   args     ArrayList lt connect gt  a new ArrayList lt connect gt      a add new connect 100 100 100 100 100     System out println a get 0  p1    System out println a get 0  p2    System out println a get 0  p3         class connect   int p1 p2 p3 p4 p5   connect int a int b int c int d int e     this p1 a   this p2 b   this p3 c   this p4 d   this p5 e         Later to get a particular value at a specific index  you can do this   a get 0  p1   a get 0  p2   a get 0  p3                 and so on

User · Answer

create simple method to do that for you   public void addMulti String   strings List list       for  int i   0  i  lt  strings length  i              list add strings i              Then you can create  String   wrong    1   2   3   4   5   6      and add it with this method to your list

User · Answer

How about    First adding your desired result as arraylist and and convert to double array as you want    Try like this    import java util ArrayList  import java util List       public class ArrayTest                            param args                     public static void main String   args                   TODO Auto-generated method stub                 Your Prepared data               List lt double   gt  values   new ArrayList lt double   gt  2                double   element1   new double     100  100  100  100  100                double   element2   new double     50  35  25  45  65                 values add element1               values add element2                   Add the result to arraylist              List lt Double gt  temp   new ArrayList lt Double gt                 for int j 0 j lt values size    j                      for  int i   0  i  lt  values get 0  length  i                          temp add values get 0  i                        temp add values get 1  i                                                    Convert arraylist to int                Double   result   temp toArray new Double temp size                  double   finalResult   new double result length      This hold final result              for  int i   0  i  lt  result length  i                      finalResult i    result i  doubleValue                               for  int i   0  i  lt  finalResult length  i                      System out println finalResult i

[java] Adding Multiple Values in ArrayList at a single index

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