程序一直错 有大神帮看看吗 错误非法类型开始 缺少标示符 错误显示22-28行

class Person{
    private String name ;
     private int age ;
           public void setName(String n){
             name = n ;
  }
      public void setAge(int a ) {
          if (a >=0 && a < 250 )
                  age = a;
        }
      public  String getName(){
      return  name ;
      }
      public   int getAge(){
          return  age;
    }
          public   void  tell (){
      System.out.println("姓名:"+name+"年龄："+age);
 }
}
      public class TestDemo{
       public  static void main (String args []) {
           Person per = new Person();
           per.setName("张三");
           per.setAge(-20);
           per.tell();
            
    }
}

谁教的写法，乱78糟的
public class Person
{
    private String name;
   
    private int age;
   
    public void setName(String n)
    {
        name = n;
    }
   
    public void setAge(int a)
    {
        if (a >= 0 && a < 250)
        {
            age = a;
        }
           
    }
   
    public String getName()
    {
        return name;
    }
   
    public int getAge()
    {
        return age;
    }
   
    public void tell()
    {
        System.out.println("姓名:" + name + "年龄：" + age);
    }
   
    public static void main(String[] args)
    {
        Person per = new Person();
        per.setName("张三");
        per.setAge(-20);
        per.tell();
    }
}
如果有人来看格式乱78糟，连看的欲望都没有