测试类应该怎么加啊？？

package com.soft.ght;
public class Person拓展 {
String name;
int age;
String address;
char sex;
int weight;
public class PersonTest{
public static void main(String[] args) {
// TODO Auto-generated method stub
Person p1=new Person();//声明并实例化Person类对象p1
Person p2=new Person();//声明并实例化Person类对象p2
//给p1赋值
p1.name="张三";
p1.age=25;
p1.address ="济南";
p1.sex ='m';
p1.weight =100;
//给p2赋值
p2.name ="李四";
p2.age =30;
p2.address ="北京";
p2.sex ='w';
p2.weight =80;
System.out.println("名字:"+p1.name +" ,年龄:"+p1.age +" ,家庭住址:"+p1.address +" ,性别:"+p1.sex +" ,体重:"+p1.weight );
System.out.println("名字:"+p2.name +" ,年龄:"+p2.age +" ,家庭住址:"+p2.address +" ,性别:"+p2.sex +" ,体重:"+p2.weight );
}

}}

我是这么写的，可是编译的时候说我错了，非要把public class PersonTest{}改成public static class PersonTest{}或者把public static void main(String[] args) {}改成public void main(String[] args) {}才显示正确。错误提示是：The method main cannot be declared static; static methods can only be declared in a static or top level type

这是哪里出了问题？我要怎么改呢？

public class Person{
String name;
int age;
String address;
char sex;
int weight;
}
public  class PersonTest{
public static void main(String[] args) {
// TODO Auto-generated method stub
Person p1=new Person();//声明并实例化Person类对象p1
Person p2=new Person();//声明并实例化Person类对象p2
//给p1赋值
p1.name="张三";
p1.age=25;
p1.address ="济南";
p1.sex ='m';
p1.weight =100;
//给p2赋值
p2.name ="李四";
p2.age =30;
p2.address ="北京";
p2.sex ='w';
p2.weight =80;
System.out.println("名字:"+p1.name +" ,年龄:"+p1.age +" ,家庭住址:"+p1.address +" ,性别:"+p1.sex +" ,体重:"+p1.weight );
System.out.println("名字:"+p2.name +" ,年龄:"+p2.age +" ,家庭住址:"+p2.address +" ,性别:"+p2.sex +" ,体重:"+p2.weight );
}

}这样写