This is the error I get:
1 error found:
File: C:\JBuilder3\myprojects\PostCardDemo.java  [line: 9]
Error: cannot resolve symbol
symbol  : constructor PostCard (java.lang.String)
location: class PostCard

My teacher told me I didn't create the class, but I thought I did
'class PostCard'. Do I have to create an additional class? The last
lines of the program are commented out, but I assume that if I fix the
other errors that one will work too.

public class PostCardDemo {
 public static void main(String[]  args)  {
    String text = "\tI'm having a wonderful\n" +
               "time at Disney World. Weather's\n" +
               "great. Wish you were here!";
 PostCard p1 = new PostCard("Vanna", text);

 PostCard p2 = new PostCard(text);
 p2.setRecipient("Merv");
 System.out.println(p2.print());
 System.out.println(p1.print());

 p2.setRecipient("Mom");
 p2.print();

 PostCard p3 = new PostCard("Sweetie",
                            "\tI'm miserable without\n" +
                            "you. It's been raining all week.\n" +
                            "I can't wait to get back home.");
 p3.print();
 }

}

 class PostCard {
   public String recipient;
   public String content;

 public PostCard(String r, String t) {
   recipient = r;
   content = t;
   content = recipient + content;
 }

 public String print(){
   return content;
 }

 public String setRecipient(String n){
   recipient = n;
   return recipient;
 }

}

 //public String toString(){
   //return PostCard("[Dear " + recipient +"]");
 //}