class Demo{

  public static void main(String[] args){

   Plane p1 = new Plane();

  Syetem.out,println(p1.model);

  System.out.println(p1.length);

  System.out.println(p1.zaiKeLiang);

Plane p2 = new Plane();

  Syetem.out,println(p1.model);

  System.out.println(p1.length);

  System.out.println(p1.zaiKeLiang);

}

}

class Plane{

Stirng model;

float length;

int zaiKeliang;

}