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Java Java Data Structures Organizing Data Comparable

how does the compareTo() method work

Looking at the code from the video, i ask myself: How can the compareTo() method be called within the definition of its own method? Code below:

@Override public int compareTo(Object obj) { BlogPost other = (BlogPost) obj; if (equals(other)) { return 0;

}
return mCreationDate.compareTo(other.mCreationDate);

}