code: public static Class getClass(String typeStr) {
          Class clazz = ReflectCache.getClassCache(typeStr);
          if (clazz == null) {
              if ("void".equals(typeStr)) {
                  clazz = void.class;
              } else if ("boolean".equals(typeStr)) {
                  clazz = boolean.class;
              } else if ("byte".equals(typeStr)) {
                  clazz = byte.class;
              } else if ("char".equals(typeStr)) {
                  clazz = char.class;
              } else if ("double".equals(typeStr)) {
                  clazz = double.class;
              } else if ("float".equals(typeStr)) {
                  clazz = float.class;
              } else if ("int".equals(typeStr)) {
                  clazz = int.class;
              } else if ("long".equals(typeStr)) {
                  clazz = long.class;
              } else if ("short".equals(typeStr)) {
                  clazz = short.class;
              } else {
                  String jvmName = canonicalNameToJvmName(typeStr);
                  clazz = ClassUtils.forName(jvmName);
              }
              ReflectCache.putClassCache(typeStr, clazz);
          }
          return clazz;
      }
docs: String转Class
  
  @param typeStr 对象描述
  @return Class[]