Converting ArrayList to Array in java

Question

I have an ArrayList with values like  abcd xyz  and  mnop qrs   I want to convert it into an Array and then split it with   as delimiter and have abcd mnop in an array and xyz qrs in another array  I tried the following code   String dsf     new String al size                   for int i  0 i lt al size   i       dsf i    al get i       But it failed saying  Ljava lang String  57ba57ba

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You don t need to reinvent the wheel  here s the toArray   method   String   dsf   new String al size     al toArray dsf

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This is the right answer you want and this solution i have run my self on netbeans  ArrayList a new ArrayList    a add 1   a add 3   a add 4   a add 5   a add 8   a add 12    int b    new int  6           Integer m     new Integer a size         Very important conversion to array              m  Integer    a toArray m   for int i 0 i lt a size   i          b i  m i        System out println b i             System out println a size

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public  T   toArray T   a  - In this method we create a array with size of arraylist and pass it as argument and it will return array of element of arraylist     String   arr   new String list size           arr   list toArray arr

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What you did with the iteration is not wrong from what I can make of it based on the question  It gives you a valid array of String objects  Like mentioned in another answer it is however easier to use the toArray   method available for the ArrayList object    http   docs oracle com javase 1 5 0 docs api java util ArrayList html toArray 28 29  Just a side note  If you would iterate your dsf array properly and print each element on its own you would get valid output  Like this   for String str   dsf      System out println str       What you probably tried to do was print the complete Array object at once since that would give an object memory address like you got in your question  If you see that kind of output you need to provide a toString   method for the object you re printing

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Here is the solution for you given scenario -   List lt String gt ls   new ArrayList lt String gt         ls add  dfsa FSDfsd        ls add  dfsdaor ooiui        String   firstArray   new String ls size          firstArray  ls toArray firstArray   String   secondArray   new String ls size     for int i 0 i lt ls size   i     secondArray i  firstArray i  split      0   firstArray i  firstArray i  split      1

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This can be done using stream   List lt String gt  stringList   Arrays asList  abc bcd    mno pqr        List lt String   gt  objects   stringList stream                                           map s - gt  s split                                               collect Collectors toList       The return value would be arrays of split string   This avoids converting the arraylist to an array and performing the operation

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List lt String gt  list new ArrayList lt String gt     list add  sravan    list add  vasu    list add  raki    String names   list toArray new String list size

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We can convert ararylist to array using 3 mrthod  public Object   toArray   - it will return array of object Object   array   list toArray     public  T   toArray T   a  - In  this way we will create array and toArray Take it as argument then return it    String   arr   new String list size          arr   list toArray arr     Public get   method  Iterate ararylist and one by one add element in array    For more details for these method Visit Java Vogue

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String   values   new String arrayList size             for  int i   0  i  lt  arrayList size    i                  values i    arrayList get i  type

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import java util    public class arrayList       public static void main String   args            Scanner sc new Scanner System in           ArrayList lt String  gt  x new ArrayList lt  gt               inserting element         x add sc next             x add sc next             x add sc next             x add sc next             x add sc next                to show element          System out println x             converting arraylist to stringarray          String  a x toArray new String x size                for String s a             System out print s

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package com v4common shared beans audittrail   import java util ArrayList  import java util List   public class test1       public static void main String arg             List lt String gt  list   new ArrayList lt String gt             list add  abcd xyz            list add  mnop qrs             Object   s   list toArray            String   s1  new String list size             String   s2  new String list size              for int i 0 i lt s length i                 if s i  instanceof String                   String temp    String s i                   if temp contains                            String   tempString   temp split                           for int j 0 j lt tempString length j                              s1 i    tempString 0                           s2 i    tempString 1                                                                               System out println s1 length           System out println s2 length           System out println s1 0            System out println s1 1

User · Answer

List lt String gt  list new ArrayList lt String gt     list add  sravan    list add  vasu    list add  raki     String names   list toArray new String 0      if you see the last line  new String 0    you don t have to give the size  there are time when we don t know the length of the list  so to start with giving it as 0   the constructed array will resize

[java] Converting ArrayList to Array in java

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