Adding to an ArrayList Java

Question

I am a beginner to java  and need some help   I am trying to convert an Abstract Data type Foo which is an associated list to an Arraylist of the strings B  How do you loop through the list and add each string to the array   I may be over thinking it  but I am lost now   Thanks for the help in advance

User · Answer

Well  you have to iterate through your abstract type Foo and that depends on the methods available on that object  You don t have to loop through the ArrayList because this object grows automatically in Java   Don t confuse it with an array in other programming languages   Recommended reading  Lists in the Java Tutorial

User · Answer

You should be able to do something like   ArrayList lt String gt  list   new ArrayList lt String gt     for  String s   foo         list add s

User · Answer

Instantiate a new ArrayList   List lt String gt  myList   new ArrayList lt String gt       Iterate over your data structure  with a for loop  for instance  more details on your code would help   and for each element  yourElement    myList add yourElement

User · Answer

If you re using Java 9  there s an easy way with less number of lines without needing to initialize or add method   List lt String gt  list   List of  first    second    third

User · Answer

If you have an arraylist of String called  foo   you can easily append  add  it to another ArrayList   list   using the following method   ArrayList lt String gt  list   new ArrayList lt String gt     list addAll foo     that way you don t even need to loop through anything

User · Answer

Array list can be implemented by the following code     Arraylist lt String gt  list   new ArrayList lt String gt     list add value1   list add value2   list add value3   list add value4

User · Answer

thanks for the help  I ve solved my problem       Here is the code if anyone else needs it  D  import java util     public class HelloWorld     public static void main String   Args     Map lt Integer List lt Integer gt  gt  map   new HashMap lt Integer List lt Integer gt  gt     List lt Integer gt  list   new ArrayList lt Integer gt     list add 1   list add 9   list add 11   map put 1 list                int First   list get 1       int Second   list get 2        if  First  lt  Second             System out println  One or more of your items have been restocked  The current stock is      First            Random rn   new Random    int answer   rn nextInt 99    1   System out println  You are buying     answer     New stock     First   First   answer  list set 1  First   System out println  There are now     First     in stock

[java] Adding to an ArrayList Java

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