【Java初学者求助】，谢谢main方法里面传参的问题

刚开始接触Java时间不久，谢谢各位帮忙。
我想要得到的结果是：输入身高和体重，然后算出来exp是否合理，谢谢，
package forth;

import java.io.*;

public class Person {
float weight;
float height;

String check()
{
    float exp = weight/(height*height);
    if(exp<18)
        return "you are a little slim";
    else if(exp>=25)
        return "you are a little fat";
    else
        return "comfortable.";
}

public void setWeight(float weight)
{
    this.weight = weight;
}
public void setHeight(float height)
{
    this.height = height;
}

public static void main(String[] args) {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    System.out.println("请输入身高：");

    try{
    float h = Integer.parseInt(br.readLine());
    }
    catch(IOException e){}

    System.out.println("请输入体重：");

    try{
    float w = Integer.parseInt(br.readLine());
    }
    catch(IOException e){}

    p.setHeight(h);//这个地方我想把前面从键盘读入的h传进来，该怎么写
    p.setWeight(w);
    p.check();

}

}

你的p从哪里来的。类里面写个构造函数，new对象的时候把参数传进去。