tests/InstanceOf3.java

   1 package tests;
   2
   3 public class InstanceOf3 {
   4         static interface i1 { };
   5         static interface i2 { };
   6         static interface i3 extends i2 { };
   7         static interface i4 extends i3 { };
   8         static interface i5 { };
   9         static class c1 { };
  10         static class c2 extends c1 implements i1 { };
  11         static class c3 extends c2 implements i4 { };
  12         static class c4 { };
  13
  14         public static void main(String []args) {
  15                 Object x = new c3();
  16                 checkInstance(x instanceof i1, "x", "i1");
  17                 checkInstance(x instanceof i2, "x", "i2");
  18                 checkInstance(x instanceof i3, "x", "i3");
  19                 checkInstance(x instanceof i4, "x", "i4");
  20                 checkInstance(x instanceof i5, "x", "i5");
  21                 checkInstance(x instanceof c1, "x", "c1");
  22                 checkInstance(x instanceof c2, "x", "c2");
  23                 checkInstance(x instanceof c3, "x", "c3");
  24                 checkInstance(x instanceof c4, "x", "c4");
  25                 checkInstance(x instanceof String, "x", "String");
  26                 checkInstance(x instanceof Integer, "x", "Integer");
  27                 checkInstance(x instanceof Object, "x", "Object");
  28         }
  29
  30         public static void checkInstance(boolean cond, String obj, String classname) {
  31                 System.out.printf(obj);
  32                 if (cond) {
  33                         System.out.printf(" is instance of ");
  34                         System.out.printf(classname);
  35                         System.out.printf(" :-)\n");
  36                 } else {
  37                         System.out.printf(" is *not* instance of ");
  38                         System.out.printf(classname);
  39                         System.out.printf(" :-(\n");
  40                 }
  41         }
  42 }