Question

Sort an ArrayList<String[]> by name in Java

The ArrayList<String[]> is inserted as follows

Apple	NY	A1
Carrots	SF	C2
Banana	SEA	B3

Sort the first column so

Apple	NY	A1
Banana	SEA	B3
Carrots	SF	C2

Answer 1

/******* ArrayListStringArrayDemo.java ******/

import java.util.ArrayList;

public class ArrayListStringArrayDemo {

   public static void main(String[] args) {

       // Creating ArrayList Which holds String Arrays
       ArrayList<String[]> arl = new ArrayList<String[]>();
       String s1[] = { "Apple", "Carrots", "Banana" };

       String s2[] = { "NY", "SF", "SEA" };
      
       // Adding arrays to the ArrayList
       arl.add(s1);
       arl.add(s2);

       String temp;
      
       // Displaying the arrays in the arraylist
       System.out.println("_______ Before Sorting ______");
       for (int i = 0; i < arl.get(0).length; i++) {
           System.out.printf("%-30s%s\n", arl.get(0)[i], arl.get(1)[i]);
       }

       // This Logic will Sort the ArrayList of Arrays of elements in Ascending
       // order
       for (int h = 0; h < arl.size(); h++) {

           for (int i = 0; i < arl.get(h).length; i++) {
               for (int j = i + 1; j < arl.get(h).length; j++) {
                   if (arl.get(h)[i].compareTo(arl.get(h)[j]) > 0) {
                       temp = arl.get(h)[i];
                       arl.get(h)[i] = arl.get(h)[j];
                       arl.get(h)[j] = temp;
                   }
               }
           }
       }

       // Displaying the arrays in the arraylist
       System.out.println("_______ After Sorting ______");
       for (int i = 0; i < arl.get(0).length; i++) {
           System.out.printf("%-30s%s\n", arl.get(0)[i], arl.get(1)[i]);
       }

   }

}

/****************************************************/

/****************************************************/

Output:

/****************************************************/