Java 使用sortedset和TreeSets。

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import java.util.Arrays;

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import java.util.SortedSet;

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import java.util.TreeSet;

/*

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*/

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public class Main 

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{

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   public static void main(String[] args)

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   {

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      // create TreeSet from array colors

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      String[] colors = {"yellow", "green", "black", "tan", "grey",

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         "white", "orange", "red", "green"};

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      SortedSet<String> tree = new TreeSet<>(Arrays.asList(colors));

      /* 

      *来 自

       n o w j a v a . c o m

      */

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      System.out.print("sorted set: ");

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      printSet(tree);

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      // get headSet based on "orange"

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      System.out.print("headSet (\"orange\"):  ");

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      printSet(tree.headSet("orange"));

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      // get tailSet based upon "orange"

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      System.out.print("tailSet (\"orange\"):  ");

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      printSet(tree.tailSet("orange"));

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      // get first and last elements

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      System.out.printf("first: %s%n", tree.first());

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      System.out.printf("last : %s%n", tree.last());

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   } 

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