code: public static <T> T isInstanceOf(Class<?> type, T obj) {
  		return isInstanceOf(type, obj, "Object [{}] is not instanceof [{}]", obj, type);
  	}
docs: 断言给定对象是否是给定类的实例
  
  <pre class="code">
  Assert.instanceOf(Foo.class, foo);
  </pre>
  
  @param <T> 被检查对象泛型类型
  @param type 被检查对象匹配的类型
  @param obj 被检查对象
  @return 被检查的对象
  @throws IllegalArgumentException if the object is not an instance of clazz
  @see Class#isInstance(Object)