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 interface i6 extends i3 { };
  10         static interface i7 extends i4, i6 { };
  11         static interface i8 extends i2, i7 { };
  12         static class c1 { };
  13         static class c2 extends c1 implements i1 { };
  14         static class c3 extends c2 implements i4 { };
  15         static class c4 { };
  16
  17         public static void main(String []args) {
  18                 Object x = new c3();
  19                 i2 y = new i3() { };
  20                 i6 z = new i6() { };
  21                 i7 u = new i7() { };
  22                 i8 v = new i8() { };
  23
  24                 checkInstance(x instanceof c1, "x", "c1");
  25                 checkInstance(x instanceof c2, "x", "c2");
  26                 checkInstance(x instanceof c3, "x", "c3");
  27                 checkInstance(x instanceof c4, "x", "c4");
  28                 checkInstance(x instanceof String, "x", "String");
  29                 checkInstance(x instanceof Integer, "x", "Integer");
  30
  31                 checkInterfaces(x, "x");
  32                 checkInterfaces(y, "y");
  33                 checkInterfaces(z, "z");
  34                 checkInterfaces(u, "u");
  35                 checkInterfaces(v, "v");
  36         }
  37
  38         public static void checkInterfaces(Object y, String name) {
  39                 checkInstance(y instanceof Object, name, "Object");
  40                 checkInstance(y instanceof i1, name, "i1");
  41                 checkInstance(y instanceof i2, name, "i2");
  42                 checkInstance(y instanceof i3, name, "i3");
  43                 checkInstance(y instanceof i4, name, "i4");
  44                 checkInstance(y instanceof i5, name, "i5");
  45                 checkInstance(y instanceof i6, name, "i6");
  46                 checkInstance(y instanceof i7, name, "i7");
  47                 checkInstance(y instanceof i8, name, "i8");
  48         }
  49
  50         public static void checkInstance(boolean cond, String obj, String classname) {
  51                 System.out.printf(obj);
  52                 if (cond) {
  53                         System.out.printf(" is instance of ");
  54                         System.out.printf(classname);
  55                         System.out.printf(" :-)\n");
  56                 } else {
  57                         System.out.printf(" is *not* instance of ");
  58                         System.out.printf(classname);
  59                         System.out.printf(" :-(\n");
  60                 }
  61         }
  62 }