1,生成有参构造方法
菜单栏->Source->Generate Constructor using Field->select all->OK
2,生成无参构造方法
菜单栏->Source->Generate Constructors from superclass->select all->OK
菜单栏->Source->Generate Constructor using Field->select all->OK
菜单栏->Source->Generate Constructors from superclass->select all->OK