libjava/testsuite/libjava.lang/pr179.java

   1 // Extended regression test for the PR 179.
   2 //
   3 // This tests the ".class" language syntax, initialization behaviour for
   4 // Class.isInstance() and Class.isAssignableFrom(), and isAssignableFrom()
   5 // functionality in the event that an interface argument that is not
   6 // implemented by any loaded class is given.
   7 //
   8 // Bryce McKinlay <bryce@albatross.co.nz>
   9
  10 class A
  11 {
  12   static
  13   {
  14     System.out.println("A initialized");
  15   }
  16 }
  17
  18 interface IA {}
  19
  20 class B implements IA
  21 {
  22   static
  23   {
  24     System.out.println("B initialized");
  25   }
  26 }
  27
  28 class C
  29 {
  30   static
  31   {
  32     System.out.println("C initialized");
  33   }
  34 }
  35
  36 interface IB {}
  37
  38 public class pr179
  39 {
  40   public static void main(String[] args)
  41   {
  42     System.out.println (A.class.isAssignableFrom (Object.class));
  43     System.out.println (IB.class.isAssignableFrom (B.class));
  44     System.out.println (IA.class.isAssignableFrom (B.class));
  45     A a = new A();
  46     System.out.println (C.class.isInstance (a));
  47     C c = new C();
  48     System.out.println (C.class.isInstance (c));
  49   }
  50 }
  51
  52 /* Expected Output:
  53 A initialized
  54 false
  55 B initialized
  56 false
  57 true
  58 C initialized
  59 false
  60 true
  61 */