How To Sort An ArrayList In Java

This is one of the famous interview questions for freshers and even for the experienced developers 🙂 let us see how to sort the ArrayList in java. We have a class Collections in java.util package, which will do this magic for us. Consider an example…

package java4s;

import java.util.ArrayList;
import java.util.Collections;

public class SortingArrayList {

    public static void main(String args[]){

       ArrayList<String> al = new ArrayList<String> ();

            al.add("22");
            al.add("33");
            al.add("11");
            al.add("cc");
            al.add("bb");
            al.add("aa");

            System.out.println("Printing List before sorting......");
             for(String value: al){
                 System.out.println(value);
             }

             //Sorting...
             Collections.sort(al);

             System.out.println("Printing List after sorting......");
             for(String value: al){
                System.out.println(value);
             }
}
}

Output

Printing List before sorting……
22
33
11
cc
bb
aa
Printing List after sorting……
11
22
33
aa
bb
cc

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::. About the Author .::
		Sivateja Kandula - Java/J2EE Full Stack Developer Founder of Java4s - Get It Yourself, A popular Java/J2EE Programming Blog, Love Java and UI frameworks. You can sign-up for the Email Newsletter for your daily dose of Java tutorials.