The following example converts a string into a collection and uses Collection.min() and Collection.max() of the Collection class to compare elements in the collection:
/*
author by w3cschool.cc
Main.java
*/import java.util.Collections; import java.util.Set;import java.util.TreeSet;class Main {
public static void main(String[] args) {
String[] coins = { "Penny", "nickel", "dime",
"Quarter", "dollar" };
Set set = new TreeSet();
for (int i = 0; i < coins.length; i++)
set.add(coins[i]);
System.out.println(Collections.min(set));
System.out.println(Collections.min(set, String.CASE_INSENSITIVE_ORDER));
for(int i=0;i<=10;i++)
System.out.print("-");
System.out.println("");
System.out.println(Collections.max(set));
System.out.println(Collections.max(set, String.CASE_INSENSITIVE_ORDER));
}}The output of the above code is: ：
Penny dime----------- nickel Quarter
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