In this post, we will see how to create 2d Arraylist in java.
Best way to create 2d Arraylist is to create list of list in java.
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List<List> arraylist2D = new ArrayList<List>(); |
Let’s create a program to implement 2d Arraylist java.
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package org.arpit.java2blog; import java.util.ArrayList; import java.util.List; public class Java2DArrayListMain { public static void main(String[] args) { // Intialize the arraylist List<List> arraylist2D = new ArrayList<List>(); // Create first list List list1=new ArrayList(); list1.add("List1_Str1"); list1.add("List1_Str2"); list1.add("List1_Str3"); // Create second list List list2=new ArrayList(); list2.add("List2_Str1"); list2.add("List2_Str2"); list2.add("List2_Str3"); // Create third list List list3=new ArrayList(); list3.add("List3_Str1"); list3.add("List3_Str2"); list3.add("List3_Str3"); list3.add("List3_Str4"); // Add individual list to arraylist2D arraylist2D.add(list1); arraylist2D.add(list2); arraylist2D.add(list3); //Let's retrieve element from the arraylist2D. System.out.println("2nd element in list3 : "+arraylist2D.get(2).get(1)); System.out.println("3nd element in list1 : "+arraylist2D.get(0).get(2)); System.out.println("1st element in list2 : "+arraylist2D.get(1).get(0)); } } |
Output:
2nd element in list3 : List3_Str2
3nd element in list1 : List1_Str3
1st element in list2 : List2_Str1
3nd element in list1 : List1_Str3
1st element in list2 : List2_Str1
That’s all about 2d Arraylist java.
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