1 /*
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  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
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  23 
  24 /**
  25  * @test
  26  * @bug 8080535 8191410
  27  * @summary Expected size of Character.UnicodeBlock.map is not optimal
  28  * @library /test/lib
  29  * @modules java.base/java.lang:open
  30  *          java.base/java.util:open
  31  * @build jdk.test.lib.util.OptimalCapacity
  32  * @run main OptimalMapSize
  33  */
  34 
  35 import jdk.test.lib.util.OptimalCapacity;
  36 
  37 // What will be the number of the Unicode blocks in the future.
  38 //
  39 // According to http://www.unicode.org/versions/Unicode7.0.0/ ,
  40 // in Unicode 7 there will be added 32 new blocks (96 with aliases).
  41 // According to http://www.unicode.org/versions/beta-8.0.0.html ,
  42 // in Unicode 8 there will be added 10 more blocks (30 with aliases).
  43 //
  44 // After implementing support of Unicode 9 and 10 in Java, there will
  45 // be 638 entries in Character.UnicodeBlock.map.
  46 //
  47 // Initialization of the map and this test will have to be adjusted
  48 // accordingly then.
  49 
  50 public class OptimalMapSize {
  51     public static void main(String[] args) throws Throwable {
  52         // The initial size of Character.UnicodeBlock.map.
  53         // See src/java.base/share/classes/java/lang/Character.java
  54         int initialCapacity = (int)(638 / 0.75f + 1.0f);
  55 
  56         OptimalCapacity.ofHashMap(Character.UnicodeBlock.class,
  57                 "map", initialCapacity);
  58     }
  59 }