• În mod implicit, numerotarea liniilor începe la 0. Acest număr crește la fiecare terminator de linie pe măsură ce datele sunt citite și poate fi modificată printr-un apel la setLineNumber(int).
• Rețineți totuși că setLineNumber(int) nu schimbă de fapt poziția curentă în flux; modifică doar valoarea care va fi returnată de getLineNumber().
• O linie este considerată terminată de oricare dintre un avans de linie ('n'), un retur de cărucior ('r') sau un retur de cărucior urmat imediat de un avans de linie.

LineNumberReader(Cititor în):Creați un nou cititor de numerotare de linii utilizând dimensiunea implicită a tamponului de intrare. LineNumberReader(Cititor în int sz):Creați un nou cititor de numerotare a liniilor care citește caractere într-un buffer de dimensiunea dată.

int getLineNumber() : Get the current line number.

  Syntax :  public int getLineNumber()   Returns:   The current line number

void mark(int readAheadLimit): Mark the present position in the stream.Subsequent calls to reset() will attempt to reposition the stream to this point and will also reset the line number appropriately.

  Syntax :  public void mark(int readAheadLimit) throws IOException   Parameters:   readAheadLimit - Limit on the number of characters that may be read while still preserving the mark. After reading this many characters attempting to reset the stream may fail.   Throws:   IOException

int read(): Read a single character.Line terminators are compressed into single newline ('n') characters. Whenever a line terminator is read the current line number is incremented.

  Syntax :  public int read() throws IOException   Returns:   The character read or -1 if the end of the stream has been reached   Throws:   IOException

int read(char[] cbuf int off int len): Read characters into a portion of an array.Whenever a line terminator is read the current line number is incremented.

  Syntax :  public int read(char[] cbuf int off int len) throws IOException   Parameters:   cbuf - Destination buffer off - Offset at which to start storing characters len - Maximum number of characters to read   Returns:   The number of bytes read or -1 if the end of the stream has already been reached Throws: IOException

String readLine() : Read a line of text.Whenever a line terminator is read the current line number is incremented.

  Syntax :  public String readLine() throws IOException   Returns:   A String containing the contents of the line not including any line termination characters or null if the end of the stream has been reached   Throws:   IOException

void reset(): Reset the stream to the most recent mark.

  Syntax :  public void reset() throws IOException   Throws:   IOException

void setLineNumber(int lineNumber): Set the current line number.

  Syntax :  public void setLineNumber(int lineNumber)   Parameters:   lineNumber - An int specifying the line number

salt lung (n lung): Skip characters.

  Syntax :  public long skip(long n) throws IOException   Parameters:   n - The number of characters to skip   Returns:   The number of characters actually skipped   Throws:   IOException IllegalArgumentException

//Java program demonstrating LineNumberReader methods import java.io.FileReader; import java.io.IOException; import java.io.LineNumberReader; class LineNumberReaderDemo {  public static void main(String[] args) throws IOException   {  FileReader fr = new FileReader('file.txt');  LineNumberReader lnr = new LineNumberReader(fr);  char c[] = new char[20];  //illustrating setLineNumber()  lnr.setLineNumber(0);    //illustrating set  System.out.println(lnr.getLineNumber());    //illustrating markSupported() method  if(lnr.markSupported())  {  System.out.println('mark() method is supported');  //illustrating mark method  lnr.mark(100);  }    /*File Contents  * This is first line  this is second line  This is third line  */    //skipping 19 characters  lnr.skip(19);  //illustrating ready() method  if(lnr.ready())  {  //illustrating readLine() method  System.out.println(lnr.readLine());  //illustrating read(char c[]int offint len)  lnr.read(c);  for (int i = 0; i <20 ; i++)  {  System.out.print(c[i]);  }    //illustrating reset() method  lnr.reset();    for (int i = 0; i <18 ; i++)  {  //illustrating read() method  System.out.print((char)lnr.read());  }  int ch;    //illustrating read() method  System.out.println(lnr.readLine());  while((ch = lnr.read())==1)  System.out.print((char)ch);  }    //close the stream  lnr.close();  } } 

0 mark() method is supported this is second line This is third line This is first line