corejava第10版

corejava第10版/v1ch09/set/SetTest.java

@@ -0,0 +1,35 @@
+package set;
+
+import java.util.*;
+
+/**
+ * This program uses a set to print all unique words in System.in.
+ * @version 1.12 2015-06-21
+ * @author Cay Horstmann
+ */
+public class SetTest
+{
+   public static void main(String[] args)
+   {
+      Set<String> words = new HashSet<>(); // HashSet implements Set
+      long totalTime = 0;
+
+      try (Scanner in = new Scanner(System.in))
+      {
+         while (in.hasNext())
+         {
+            String word = in.next();
+            long callTime = System.currentTimeMillis();
+            words.add(word);
+            callTime = System.currentTimeMillis() - callTime;
+            totalTime += callTime;
+         }
+      }
+
+      Iterator<String> iter = words.iterator();
+      for (int i = 1; i <= 20 && iter.hasNext(); i++)
+         System.out.println(iter.next());
+      System.out.println(". . .");
+      System.out.println(words.size() + " distinct words. " + totalTime + " milliseconds.");
+   }
+}