How to Sort ArrayList of String and Integer in Java

In this tutorial you will learn how to sort ArrayList of String or Integer in Java.

We can easily sort an arraylist in ascending or descending order using Collections.sort() method.

Below I have shared simple example for each of them.

Sort ArratList in Java

Example to Sort ArrayList of String

Below program sorts an arraylist of String type.

package com;

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

public class SortStringArrayList {
	public static void main(String args[]){
		ArrayList<String> aList = new ArrayList<String>();
		aList.add("Android");
		aList.add("Windows");
		aList.add("IOS");
		aList.add("Linux");
		aList.add("Mac");
		
		System.out.println("Sort in ascending order");
		Collections.sort(aList);
		for(String s:aList){
			System.out.println(s);
		}

		
		System.out.println("\nSort in descending order");
		Collections.sort(aList,Collections.reverseOrder());
		for(String s:aList){
			System.out.println(s);
		}
	}
}

Output

Sort in ascending order
Android
IOS
Linux
Mac
Windows

Sort in descending order
Windows
Mac
Linux
IOS
Android

Example to Sort ArrayList of Integer

Below program sorts an arraylist of Integer type.

package com;

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

public class SortIntegerArrayList {
	public static void main(String args[]){
		ArrayList<Integer> aList = new ArrayList<Integer>();
		aList.add(20);
		aList.add(15);
		aList.add(25);
		aList.add(10);
		aList.add(30);
		
		System.out.println("Sort in ascending order");
		Collections.sort(aList);
		for(Integer i:aList){
			System.out.println(i);
		}

		
		System.out.println("\nSort in descending order");
		Collections.sort(aList,Collections.reverseOrder());
		for(Integer i:aList){
			System.out.println(i);
		}
	}
}

Output

Sort in ascending order
10
15
20
25
30

Sort in descending order
30
25
20
15
10

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