Java 实例以下实例将字符串转换为集合并使用 Collection 类的 Collection.min() 和 Collection.max() 来比较集合中的元素：
Main.java 文件
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<String> set = new TreeSet<String>(); 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)); }}
以上代码运行输出结果为：
Pennydime-----------nickelQuarter