title: Java: How to make this Serializable?
body: <p>I need the following class to be Serializable.</p>
  
  <pre><code>package helpers;
  
  public class XY implements Comparable&lt;XY&gt;
  {
      public int x;
      public int y;
  
      public XY (int x, int y)
      {
          this.x = x;
          this.y = y;
      }
  
      public int compareTo( XY other ) 
      {
          String compare1 = this.x + "-" + this.y;
          String compare2 = other.x + "-" + other.y;
  
          return compare1.compareTo( compare2 );
      }
  
      public String toString()
      {
          return this.x + "-" + this.y;
      }
  
  }
  </code></pre>
  
  <p>As of now, I can't send it as an object with outputstream..I´ve tried to implement Serializable, but that didn't work.</p>