sort a set in java code example

Example 1: java list to set

Set<Foo> foo = new HashSet<Foo>(myList);

Example 2: selection sort in java

public static void SelectionSort(int[] arr)
{
  int small;
  for (int i = 0; i <arr.length - 1; i++)
  {
    small = i;
    for (int j = i + 1; j < arr.length; j++)
    {
      //if current position is less than previous smallest
      if (arr[j] < arr[small])
      {
        small = j;
        
        //swap values
        int temp = arr[i];
        arr[i] = arr[small];
        arr[small] = temp; 
      }
  	}
  }
}

Example 3: how to sort collection in java

// Use Collections.sort()
import java.util.*;
ArrayList<String> al = new ArrayList<String>();
al.add("teach");
al.add("sleep");
al.add("geek");
Collections.sort(al);//just pass any collection object reference
System.out.println(al);//output :- [geek,sleep,teach]

or
/*
ArrayList<Integer> intal = new ArrayList<Integer>();
al.add(4);
al.add(8);
al.add(2);
Collections.sort(intal);
System.out.println(intal);//output :- [2,4,8]
*/