package light;

public class light {

    /**
     * @param args
     */
    //public static void main(String[] args) {
        // TODO Auto-generated method stub
    //public class Light {
        private int watts;
        private boolean indicator;

          //int watts;
    //boolean indicator;

        
         public light(int watts) {
              this.watts = watts;
             }


        
         public light(int watts, boolean indicator) {
              super();
              this.watts = watts;
             this.indicator = indicator;
              //this.watts = 230;
                  //this.indicator = true;
             }


        public void switchOn()
        {
            this.indicator = true;
        }

        //开灯，即将灯的状态置为开
        public void switchOff()
        {
            this.indicator = false;
        }

        //关灯
        public void printInfo()
        {
            System.out.println("灯的瓦数是：" + this.watts + "\n开关状态是：" + this.indicator);
        }

        //输出灯的瓦数信息和开关状态
        

}

java编写一个Light类，该类是对灯的瓦数的描述

程序的入口被你注释掉了从哪开始执行？

别问了，回去重新好好看看书吧