test/jdk/java/lang/Character/UnicodeBlock/OptimalMapSize.java

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/**
 * @test
 * @bug 8080535
 * @summary Expected size of Character.UnicodeBlock.map is not optimal
 * @library /lib/testlibrary
 * @modules java.base/java.lang:open
 *          java.base/java.util:open
 * @build jdk.testlibrary.OptimalCapacity
 * @run main OptimalMapSize
 */

import jdk.testlibrary.OptimalCapacity;

// What will be the number of the Unicode blocks in the future.
//
// According to http://www.unicode.org/versions/Unicode7.0.0/ ,
// in Unicode 7 there will be added 32 new blocks (96 with aliases).
// According to http://www.unicode.org/versions/beta-8.0.0.html ,
// in Unicode 8 there will be added 10 more blocks (30 with aliases).
//
// After implementing support of Unicode 7 and 8 in Java, there will
// be 510+96+30 = 636 entries in Character.UnicodeBlock.map.
//
// Initialization of the map and this test will have to be adjusted
// accordingly then.

public class OptimalMapSize {
    public static void main(String[] args) throws Throwable {
        // The initial size of Character.UnicodeBlock.map.
        // See src/java.base/share/classes/java/lang/Character.java
        int initialCapacity = (int)(510 / 0.75f + 1.0f);

        OptimalCapacity.ofHashMap(Character.UnicodeBlock.class,
                "map", initialCapacity);
    }
}