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Thread: Searching for words in a file

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    Default Searching for words in a file

    Good morning , i am writing a program that will wait for the user to enter a molecule , lets say he enters " h20" the program will go to a file search for the word and puts the weight name .. into an array , the problem is that i can't find a way on how to search for the "key word" or in our case "h20" , i want my program to search for this word an puts all of the line after h20 as an array . I hope you can help me guys thanks.
    P.S : I just want a solution on how to find the key word and put the line after the key word in an array , because it may sound i need someone to do the program for me , i needed to clarify that , thanks.


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    Default Re: Searching for words in a file

    how to search for the "key word"
    What have you tried?
    One approach: read each line of the file as a String and use one of the String class's methods to see if the line contains the word.
    If you don't understand my answer, don't ignore it, ask a question.

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    Default Re: Searching for words in a file

    " one of the String class's "
    could you give me an example ? and are you sure it's the best way that is to divide the lines in lines ? Consider the file is too large isn't it wrong to consider the file as many lines and then to search our word?

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    Default Re: Searching for words in a file

    See the String class's API doc for all its methods. For example, look at indexOf().
    Java Platform SE 7
    divide the lines in lines
    Not sure what that means. I'm assuming a line is a string of characters ending with a line-end character.
    The size of the file doesn't matter when reading lines from the file as long as the length of the lines is reasonable. The program will only save some of the file's lines as needed. Most can be discarded after searching them.
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