Java - Data Structures : Interfaces

Example.java:30: error: cannot find symbol                               
        Arrays.sort(treets);                                             
        ^                                                                
  symbol:   variable Arrays                                              
  location: class Example                                                
./com/teamtreehouse/Treet.java:34: error: cannot find symbol             
            return mDescription(other.mDescription);                     
                   ^                                                     
  symbol:   method mDescription(String)                                  
  location: class Treet                                                  
2 errors

import java.util.Date;

import com.teamtreehouse.Treet;

public class Example {

    public static void main(String[] args) {
        Treet treet = new Treet(
            "craigdennis",
            "Want to be famous? Simply tweet about Java and use " +
            "the hashtag #treet. I\'ll use your tweet in the new " +
            "@treehouse course about data structures.",
            new Date(1421849732000L)
        );

        Treet secondTreet = new Treet(
            "journeytocode",
            "@treehouse makes learning Java sooooooo fun! #treet",
            new Date(1421878767000L)
        );

        System.out.printf("This is a new Treet:  %s %n", treet);
        System.out.println("The words are: ");

        for (String word : treet.getWords()) {
            System.out.println(word);
        }

        Treet[] treets = {treet, secondTreet};
        Arrays.sort(treets);

        for (Treet exampleTreet : treets) {
            System.out.println(exampleTreet);
        }
    }
}

package com.teamtreehouse;

import java.util.Date;
import java.util.Arrays;

public class Treet implements Comparable {
    private String mAuthor;
    private String mDescription;
    private Date mCreationDate;

    public Treet(String author, String description, Date creationDate) {
        mAuthor = author;
        mDescription = description;
        mCreationDate = creationDate;
    }

    @Override
    public String toString() {
        return String.format("Treet: \"%s\" by %s on %s", 
                             mDescription, mAuthor, mCreationDate);
    }

    @Override
    public int compareTo(Object obj) {
        Treet other = (Treet) obj;

        if (equals(other)) {
            return 0;
        }

        int dateCmp = 
mCreationDate.compareTo(other.mCreationDate);

        if (dateCmp == 0) {
        return mDescription(other.mDescription);
        }

        return dateCmp;
    }

    public String getAuthor() {
        return mAuthor;
    }

    public String getDescription() {
        return mDescription;
    }

    public Date getCreationDate() {
        return mCreationDate;
    }

    public String[] getWords() {
        return mDescription.toLowerCase().split("[^\\w#@']+");
    }
}