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mijurg
16,044 Pointsreturns compile error... why bolean instead of string?
this course started to be confusing very fast....
./com/example/BlogPost.java:39: error: incompatible types: boolean cannot be converted to List return results.add(word); ^ Note: JavaTester.java uses unchecked or unsafe operations. Note: Recompile with -Xlint:unchecked for details. 1 error
Here is a code that gives me problems:
public List<String> getExternalLinks() { List<String> results = new ArrayList<String>(); for (String word : getWords()) { if(word.startsWith("http")) { return results.add(word); } } return results; }
3 Answers
Parth Sehgal
362 PointsYour method is:
public List<String> getExternalLinks()
You specify the return type as
List<String>
In your function, you are trying to add every word that starts with 'http' into your array called results.
The problem is here:
return results.add(word);
That should just be:
results.add(word);
The add function returns true if the collection is changed by the add operation. But you specified that your function returns
List<String>
earlier. So that's the problem. You should just add to the results array, you can check the return value if you want, but it probably isn't necessary.
Parth Sehgal
362 PointsRight, I was just saying that he could check the return value of results.add(word) and make sure that it is true if he really wanted to. But it's probably not necessary.
mijurg
16,044 PointsThank You all, i already figured that out. But reading documentation is so confusing sometimes... This is the first time i got into a problem i couldnt solve on my own for a long long time. Thank you again.
J.D. Sandifer
18,813 PointsJ.D. Sandifer
18,813 PointsParth, returning the
List<String>is part of the requirements of the problem so that should stay the same. Your correction to the premature return statement is all Mijurg needs to change.