Explaining Python and converting into Java

Question

In Darius Bacon's code, on the line 11 and 12, there is the following code:

prefixes = set(word[:i] for word in words for i in range(2, len(word)+1))

I'm trying to translate his program into Java and I'm having difficulties with this one.

What does this do?

So what have you tried? Beyond that, translating code from one language to another is always a terrible idea. It generally means you end up with code that doesn't use the features of the language and behaves weirdly. Take what the code is doing and do it in the language you want to do, rather than trying to translate the code itself. — Gareth Latty
– Gareth Latty, Commented Nov 11, 2012 at 17:58
Sorry, I didn't come up with any other word ;) Of course it's not 1:1 with Darius' program and therefore not translating. — MikkoP
– MikkoP, Commented Nov 11, 2012 at 18:05

Eric · Accepted Answer · 2012-11-11 17:44:54Z

6

Expanding the list comprehension:

prefixes = set()
for word in words:
    for i in range(2, len(word)+1)
        prefixes.add(word[:i])

word[:i] is word up to but not including index i

answered Nov 11, 2012 at 17:44

Eric

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1 Comment

MikkoP Over a year ago

Thanks for expaining! This clarified the code and I managed to code it in Java :)

Ankur · Accepted Answer · 2012-11-11 17:50:28Z

3

Try this in Java

Set<String> prefixes = new HashSet<String>();
for(String word:words){
  for(int i=1;i<word.length;i++){ 
     prefixes.add(word.substring(0,i));
  }
}

edited Nov 11, 2012 at 17:50

answered Nov 11, 2012 at 17:48

Ankur

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