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Java Java Data Structures Organizing Data Comparable

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

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;