java - remove a line that contains a specific character -

i have text file structured this, sample:

# timestamp, x, y, mac address of ap, rss 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:85:a4:01 -77 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:85:a4:02 -77 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:8e:e9:a2 -72 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:87:04:c2 -69 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:87:04:d1 -86 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:87:04:d2 -87 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:85:a4:12 -96 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:87:03:f1 -65 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:87:03:f2 -67 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:87:03:e2 -61 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:84:92:12 -95 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:85:a4:00 -77 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:87:04:d0 -87 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:87:03:f0 -70 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:8e:e9:b1 -90 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:8e:e9:b2 -92 1395422922871 6.241992473602295 0.9473437666893005 00:1a:1e:8e:e9:b0 -91 

i write java program searches following characters: 00:1a:1e:85:a4:00 , 00:1a:1e:87:04:d0 , removes lines containes characters.

i have following program:

public class extract {     public static void main (string[] args) throws java.lang.exception     {     file inputfile = new file("myfile.txt");     file tempfile = new file("mytempfile.txt");      bufferedreader reader = new bufferedreader(new filereader(inputfile));     bufferedwriter writer = new bufferedwriter(new filewriter(tempfile));      string linetoremove = "00:1a:1e:87:04:d0";     string currentline;      while((currentline = reader.readline()) != null) {         // trim newline when comparing linetoremove         string trimmedline = currentline.trim();         if(trimmedline.equals(linetoremove)) continue;         writer.write(currentline);     }      writer.close();     boolean successful = tempfile.renameto(inputfile);     }  } 

but can remove characters matches entire line , output file contained in 1 line, have recommendations on have modify obtain desired output?

this think should like. may have formatting wrong on try () bit, see if compiles.

java 1.6:

public class extract {     public static void main (string[] args) throws java.lang.exception {          final file inputfile = new file("myfile.txt");         final file tempfile = new file("mytempfile.txt");          bufferedreader reader = null;         bufferedwriter writer = null;         try {             reader = new bufferedreader(new filereader(inputfile));             writer = new bufferedwriter(new filewriter(tempfile));              final string linetoremove1 = "00:1a:1e:87:04:d0";             final string linetoremove2 = "00:1a:1e:85:a4:00";             string currentline;              while((currentline = reader.readline()) != null) {                 // trim newline when comparing linetoremove                 final string trimmedline = currentline.trim();                 if (!currentline.contains(linetoremove1)                          && !currentline.contains(linetoremove2)) {                     writer.write(currentline);                     writer.newline();                 }             }         } {             if (reader != null) {                  reader.close();             }             if (writer != null) {                 writer.close();             }         }     } } 

java 1.7+ :

public class extract {     public static void main (string[] args) throws java.lang.exception {          final file inputfile = new file("myfile.txt");         final file tempfile = new file("mytempfile.txt");          try(             final bufferedreader reader = new bufferedreader(new filereader(inputfile));             final bufferedwriter writer = new bufferedwriter(new filewriter(tempfile));         ) {              final string linetoremove1 = "00:1a:1e:87:04:d0";             final string linetoremove2 = "00:1a:1e:85:a4:00";             string currentline;              while((currentline = reader.readline()) != null) {                 // trim newline when comparing linetoremove                 final string trimmedline = currentline.trim();                 if (!currentline.contains(linetoremove1)                          && !currentline.contains(linetoremove2)) {                     writer.write(currentline);                     writer.newline();                 }             }         } {             if (reader != null) {                  reader.close();             }             if (writer != null) {                 writer.close();             }         }     } }