图说jdk1.8新特性（5）— 编译器新特性

• 2019 年 10 月 31 日
• 筆記

/**       * Returns the name of the parameter.  If the parameter's name is       * {@linkplain #isNamePresent() present}, then this method returns       * the name provided by the class file. Otherwise, this method       * synthesizes a name of the form argN, where N is the index of       * the parameter in the descriptor of the method which declares       * the parameter.       *       * @return The name of the parameter, either provided by the class       *         file or synthesized if the class file does not provide       *         a name.       */      public String getName() {          // Note: empty strings as paramete names are now outlawed.          // The .equals("") is for compatibility with current JVM          // behavior.  It may be removed at some point.          if(name == null || name.equals(""))              return "arg" + index;          else              return name;      }

说明：

• jdk1.8反射包增加了Parameter类，通过该类的getName方法能在运行时得到参数的名称
• 如果没有通过-parameters指定编译器在编译的时候将参数名编译进去，那么得到的参数名称将会是arg1、arg2、arg3这种默认的参数名