Sort ArrayList in java

In the previous post, we have seen how to remove an element at a specified index. In this post, we will see how to sort arraylist in java.

We use the collections class to sort the arraylist.

Syntax:

Collections.sort(arraylist)

Example for sorting String:

We will see how to sort the string.

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

public class ArrayListEx {

	public static void main(String[] args) {
		ArrayList<String> fruits = new ArrayList<String>();
		fruits.add("Orange");
		fruits.add("Mango");
		fruits.add("Apple");
		fruits.add("Grapes");

		System.out.println("List of fruits before sorting : "+fruits);
		Collections.sort(fruits);  //sort the arraylist
		
		System.out.println("List of fruits after sorting : "+fruits);
	}
}

Output:

Example for sorting the integer:

We will see how to sort the Integer values.

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

public class ArrayListEx {

	public static void main(String[] args) {
		ArrayList<Integer> num = new ArrayList<Integer>();
		num.add(4);
		num.add(2);
		num.add(6);
		num.add(1);

		System.out.println("List of integer before sorting : "+num);
		Collections.sort(num);  //sort the arraylist
		
		System.out.println("List of integer after sorting : "+num);
	}
}

Output: