Question

//Java

(Sort ArrayList) Write the following method that sorts an ArrayList:
public static >
void sort(ArrayList list)
Write a test program that does the following operations:
4. Creates an empty ArrayList of Integer elements;
5. Generates 20 integer values, drawn at random between 0 and 9 (included), and adds them to
the array list;
6. Calls the method sort and prints both the original list, and the sorted one.

Answer 1

import java.util.ArrayList;
import java.util.Random;

public class SortArrayListNumbers {

    public static void sort(ArrayList<Integer> list) {
        int temp;
        for(int i = 0; i < list.size(); ++i) {
            for(int j = 0; j < list.size()-1; ++j) {
                if(list.get(j).compareTo(list.get(j+1)) > 0) {
                    temp = list.get(j);
                    list.set(j, list.get(j+1));
                    list.set(j+1, temp);
                }
            }
        }
    }

    public static void main(String[] args) {
        ArrayList<Integer> list = new ArrayList<>();
        Random random = new Random();
        for(int i = 0; i < 20; ++i) {
            list.add(random.nextInt(10));
        }
        System.out.println("Array List: " + list);
        sort(list);
        System.out.println("Sorted Array List: " + list);
    }

}