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Java Java Data Structures - Retired Organizing Data Comparable

Posted by remi poolen
remi poolen
6,697 Points

I guessed this answer correct but i don't know why.

The question was to make a list of BlogPosts sorting on oldest first. But if i wanted to do the newest first? than i really have no clue on what to change in the code.

1 Answer

Ezekiel dela Peña
Ezekiel dela Peña
6,231 Points
Ezekiel dela Peña
Ezekiel dela Peña
6,231 Points

you just have to return the value of what you are comparing to get the correct answer.

return mCreationDate.compareTo(obj.getCreationDate());

or you can also do this approach

int dateCmp = mCreationDate.compareTo(obj.getCreationDate());

// This is for double checking purposes.
if(dateCmp == 0) {
    return mTitle.compareTo(obj.getTitle());
} else {
    return dateCmp;
}