If you need to search for an occurrence of a word in a sentence, there are several methods in the String class that can help. The simplest is probably contains(). For example,

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A few things to watch out for though with this simple example:


1. This example is a case-sensitive match, so 'you' would not, for example, match with 'You'. If you want to do a case insensitive search, convert the sentence  and the keywords into lowercase using the toLowercase()

2. This example would not count the number of matches if there is more than one occurrence in a single sentence. If you need to do that, you are probably best splitting the sentence into tokens.

3. This example would match matches within longer words (e.g. it would match 'you' with 'youth'. Again, the best way to avoid this would be to break the sentence down into individual words with split() and then do an equalsIgnoreCase() on each word.

I would recommend looking at the String API documentation for a longer list of possibly useful methods.

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You are trying to use contains with an array of Strings rather than each element of the array. Something like this will work
Code:

String[] lines = loadStrings("Fileoftext.txt");
for(int i = 0; i < lines.length; i++){
  if(lines[i].contains("BRUTUS"))
   println(lines[i]);
}
 

and the following would create the error you experienced
Code:

lines.contains("BRUTUS")
 

All works as expected here...

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