90                 throw new Exception("byte UUID collision very unlikely");
  91             list.add(u1);
  92         }
  93     }
  94 
  95     private static void stringTest() throws Exception {
  96         for (int i=0; i<100; i++) {
  97             UUID u1 = UUID.randomUUID();
  98             UUID u2 = UUID.fromString(u1.toString());
  99             if (!u1.equals(u2))
 100                 throw new Exception("UUID -> string -> UUID failed");
 101         }
 102 
 103         testFromStringError("-0");
 104         testFromStringError("x");
 105         testFromStringError("----");
 106         testFromStringError("-0-0-0-0");
 107         testFromStringError("0-0-0-0-");
 108         testFromStringError("0-0-0-0-0-");
 109         testFromStringError("0-0-0-0-x");






 110     }
 111 
 112     private static void testFromStringError(String str) {
 113         try {
 114             UUID test = UUID.fromString(str);
 115             throw new RuntimeException("Should have thrown IAE");
 116         } catch (IllegalArgumentException iae) {
 117             // pass
 118         }
 119     }
 120 
 121     private static void versionTest() throws Exception {
 122         UUID test = UUID.randomUUID();
 123         if (test.version() != 4)
 124             throw new Exception("randomUUID not type 4");
 125         Random byteSource = new Random();
 126         byte[] someBytes = new byte[12];
 127         byteSource.nextBytes(someBytes);
 128         test = UUID.nameUUIDFromBytes(someBytes);
 129         if (test.version() != 3)

  90                 throw new Exception("byte UUID collision very unlikely");
  91             list.add(u1);
  92         }
  93     }
  94 
  95     private static void stringTest() throws Exception {
  96         for (int i=0; i<100; i++) {
  97             UUID u1 = UUID.randomUUID();
  98             UUID u2 = UUID.fromString(u1.toString());
  99             if (!u1.equals(u2))
 100                 throw new Exception("UUID -> string -> UUID failed");
 101         }
 102 
 103         testFromStringError("-0");
 104         testFromStringError("x");
 105         testFromStringError("----");
 106         testFromStringError("-0-0-0-0");
 107         testFromStringError("0-0-0-0-");
 108         testFromStringError("0-0-0-0-0-");
 109         testFromStringError("0-0-0-0-x");
 110         testFromStringError("123456789-1234-1234-1234-123456789012");
 111         testFromStringError("123456789-2-3-4-5");
 112         testFromStringError("1-12345-3-4-5");
 113         testFromStringError("1-2-12345-4-5");
 114         testFromStringError("1-2-3-12345-5");
 115         testFromStringError("1-2-3-4-1234567890123");
 116     }
 117 
 118     private static void testFromStringError(String str) {
 119         try {
 120             UUID test = UUID.fromString(str);
 121             throw new RuntimeException("Should have thrown IAE");
 122         } catch (IllegalArgumentException iae) {
 123             // pass
 124         }
 125     }
 126 
 127     private static void versionTest() throws Exception {
 128         UUID test = UUID.randomUUID();
 129         if (test.version() != 4)
 130             throw new Exception("randomUUID not type 4");
 131         Random byteSource = new Random();
 132         byte[] someBytes = new byte[12];
 133         byteSource.nextBytes(someBytes);
 134         test = UUID.nameUUIDFromBytes(someBytes);
 135         if (test.version() != 3)