java - How to compare String to all elements in an array? -

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this question has answer here:

i looking way compare string (which in case line text file) every element in array , see if there match. @ high level overview, have string array (about 100 elements) full of strings contained somewhere in file need deleted. reading file stringbuffer , writing each line, except skipping on lines match element in array. have far:

//main class calling method public class testapp {   public static void main(string[] args) {     compareanddelete.removeduplicatelines("c:/somelocation", 2darray);   } }   public class compareanddelete {    static string line_of_text;   static stringbuffer localbuff = new stringbuffer();   static filereader buffer;   static bufferedreader user_file;          public static void removeduplicatelines(string local, string[][] duplicates) throws ioexception          {           //converting 2d array one-dimensional array           final string[] finaldups = new string[duplicates.length];           for(int = 0; < duplicates.length; i++)         {             finaldups[i] = duplicates[i][0]+" "+duplicates[i][1];         }            int count = 0;           user_file = new bufferedreader(buffer);           set<string> values = new hashset<string>(arrays.aslist(finaldups));           while((line_of_text = user_file.readline()) != null){             if(!(values.contains(line_of_text))){                 localbuff.append(line_of_text+"\n");             }else{                 count++;             }         }         system.out.println(count);          //printing stringbuffer file         bufferedwriter testoutfile = new bufferedwriter(new filewriter("c:/test.txt"));         testoutfile.write(localbuff.tostring());         testoutfile.flush();         testoutfile.close();     }

so unsure of if statment, know not work properly, removing first few elements in new stringbuffer because lines happen towards end of file, , not recheck every line match each element. know there has better way this... in advance help/suggestions.

**updated: code above, throwing following error on line:

while((line_of_text = user_file.readline()) != null){

error:

exception in thread "main" java.io.ioexception: stream closed   @ sun.nio.cs.streamdecoder.ensureopen(streamdecoder.java:51)   @ sun.nio.cs.streamdecoder.read(streamdecoder.java:204)   @ java.io.inputstreamreader.read(inputstreamreader.java:188)   @ java.io.bufferedreader.fill(bufferedreader.java:147)   @ java.io.bufferedreader.readline(bufferedreader.java:310)   @ java.io.bufferedreader.readline(bufferedreader.java:373)   @ compare.compareanddelete.removeduplicatelines(compareanddelete.java:48)   @ mainpackage.testapp.main(testapp.java:326)

this can accomplished quite efficiently adding string array members set, , checking whether set contains() current line. example:

set<string> ignoredstrings = new hashset<string>(arrays.aslist(arr));  string line; while ((line = file.readline()) != null) {     if (!ignoredstrings.contains(line)) {         buffer.append(line);         buffer.append("\n");     } }

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