### Question:
ClassDemo { public void classTest (){ System.out.println(System.currentTimeMillis()); System.out.println(System.nanoTime()); String[] arrays = new String[1]; System.out.println(Arrays.toString(arrays.getClass().getInterfaces())); System.out.println(arrays.getClass().getPackage()); System.out.println(arrays.getClass().getDeclaringClass()); Map<String,Object> map = new HashMap<>(); System.out.println(Arrays.toString(map.getClass().getGenericInterfaces())); System.out.println(map.getClass().getPackage()); System.out.println(map.getClass().getDeclaringClass()); System.out.println(Arrays.toString(map.getClass().getTypeParameters())); System.out.println(map.getClass().getGenericSuperclass()); }  void classTest();  }### Answer:
@Test public void test(){ ClassDemo classDemo = new ClassDemo(); classDemo.classTest(); }