فئة JAVA.IO.LINENUMBERINPUTSTREAM في جافا

فئة java.io.LineNumberInputStream هي ببساطة امتداد لتدفق الإدخال مما يوفر وسيلة إضافية للاحتفاظ بسجل رقم السطر الحالي.

خط عبارة عن سلسلة من البايتات تنتهي بـ : 'r'، أي حرف إرجاع أو حرف السطر الجديد: 'n' أو حرف تغذية يتبع حرف الإرجاع.

تصريح :

public class LineNumberInputStream extends Reader

البنائين :

  LineNumberInputStream(InputStream in) :    Constructs a newline no. stream that reads it's input from the specified Input Stream.

طُرق:

بناء الجملة :

public int read()   Parameters :    -------   Return :    int value representing the bytes in the range of '0 - 255'. return -1 indicating end of Input Stream.   Exception:    IOException : in case I/O error occurs

تطبيق :

Java

    // Java program illustrating the working of read() method   import     java.io.*  ;   public     class   NewClass   {      public     static     void     main  (  String  []     args  )     throws     IOException      {      // LineNumberInputStream & FileInputStream initially null      LineNumberInputStream     geekline     =     null  ;      FileInputStream     geekinput     =     null  ;      try  {      char     c  ;      int     a  ;      // New InputStream : 'ABC' is created      geekinput     =     new     FileInputStream  (  'ABC.txt'  );      geekline     =     new     LineNumberInputStream  (  geekinput  );      // read() method returning Bytes of Input Stream as integer      // '-1' indicating to read till end Of Input Stream      while  ((  a     =     geekline  .  read  ())     !=     -  1  )      {      // Since read() method returns Integer value      // So we convert each integer value to char      c     =     (  char  )  a  ;      System  .  out  .  print  (  c  );      }      }      catch  (  Exception     e  )      {      // In case of error      e  .  printStackTrace  ();      System  .  out  .  println  (  'ERROR Occurs '  );      }      finally      {      // Closing the streams Once the End of Input Stream is reached      if  (  geekinput     !=     null  )      geekinput  .  close  ();      if  (  geekline     !=     null  )      geekline  .  close  ();      }      }   }

ملحوظة :
لن يتم تشغيل كود Java التالي هنا حيث لا يمكننا الوصول إلى أي ملف على IDE عبر الإنترنت.
لذا انسخ البرنامج إلى نظامك وقم بتشغيله هناك.

ال ABC.txt الملف المستخدم في البرنامج يحتوي على :

Hello Geeks. Explaining read() method

الإخراج :

Hello Geeks. Explaining read() method

بناء الجملة :

 public int getLineNumber()   Parameters :    -------   Return :    no. of current line

تطبيق :

Java

    // Java program illustrating the working of getLineNumber() method   import     java.io.*  ;   public     class   NewClass   {      public     static     void     main  (  String  []     args  )     throws     IOException      {      // LineNumberInputStream & FileInputStream initially null      LineNumberInputStream     geekline     =     null  ;      FileInputStream     geekinput     =     null  ;      try      {      char     c  ;      int     a       b  ;      // New InputStream : 'ABC' is created      geekinput     =     new     FileInputStream  (  'ABC.txt'  );      geekline     =     new     LineNumberInputStream  (  geekinput  );      while  ((  a     =     geekline  .  read  ())     !=     -  1  )      {      // So we convert each integer value to char      c     =     (  char  )  a  ;          // Use of getLineNumber() : to print line no.      a     =     geekline  .  getLineNumber  ();      System  .  out  .  println  (  ' At line : '     +     a  );      System  .  out  .  print  (  c  );      }      a     =     geekline  .  getLineNumber  ();      System  .  out  .  println  (  ' at line: '     +     a  );      }      catch  (  Exception     e  )      {      // In case of error      e  .  printStackTrace  ();      System  .  out  .  println  (  'ERROR Occurs '  );      }      finally      {      // Closing the streams Once the End of Input Stream is reached      if  (  geekinput     !=     null  )      geekinput  .  close  ();         if  (  geekline     !=     null  )      geekline  .  close  ();      }      }   }

ال ABC.txt الملف المستخدم في البرنامج يحتوي على :

no. of lines

الإخراج :

 At line : 0 n At line : 0 o At line : 0 . At line : 0 At line : 0 o At line : 0 f At line : 1 At line : 1 l At line : 1 i At line : 1 n At line : 1 e At line : 1 s at line: 1

بناء الجملة :

public int available()   Parameters :    -------   Return :    returns the no. of bytes that can be read from the Input Stream.   Exception:    IOException : in case I/O error occurs

تطبيق :

Java

    // Java program illustrating the working of available() method   import     java.io.*  ;   public     class   NewClass   {      public     static     void     main  (  String  []     args  )     throws     IOException      {      // LineNumberInputStream & FileInputStream initially null      LineNumberInputStream     geekline     =     null  ;      FileInputStream     geekinput     =     null  ;      try  {      char     c  ;      int     a       b  ;      // New InputStream : 'ABC' is created      geekinput     =     new     FileInputStream  (  'ABC.txt'  );      geekline     =     new     LineNumberInputStream  (  geekinput  );      while  ((  a     =     geekline  .  read  ())     !=     -  1  )      {      // So we convert each integer value to char      c     =     (  char  )  a  ;      // Use of available method : return no. of bytes that can be read      a     =     geekline  .  available  ();      System  .  out  .  println  (  c     +     ' Bytes available : '     +     a  );      }      }      catch  (  Exception     e  )      {      // In case of error      e  .  printStackTrace  ();      System  .  out  .  println  (  'ERROR Occurs '  );      }      finally      {      // Closing the streams Once the End of Input Stream is reached      if  (  geekinput     !=     null  )      geekinput  .  close  ();      if  (  geekline     !=     null  )      geekline  .  close  ();      }      }   }

ال ABC.txt الملف المستخدم في البرنامج يحتوي على :

available

الإخراج :

a Bytes available : 4 v Bytes available : 3 a Bytes available : 3 i Bytes available : 2 l Bytes available : 2 a Bytes available : 1 b Bytes available : 1 l Bytes available : 0 e Bytes available : 0

بناء الجملة :

public void setLineNumber(int arg)   Parameters :    arg : line number to assign   Return :    void   Exception:    -----

تطبيق :

Java

    // Java program illustrating the working of setLineNumber() method   import     java.io.*  ;   public     class   NewClass   {      public     static     void     main  (  String  []     args  )     throws     IOException      {      // LineNumberInputStream & FileInputStream initially null      LineNumberInputStream     geekline     =     null  ;      FileInputStream     geekinput     =     null  ;      try  {      char     c  ;      int     a       b     =     0  ;      // New InputStream : 'ABC' is created      geekinput     =     new     FileInputStream  (  'ABC.txt'  );      geekline     =     new     LineNumberInputStream  (  geekinput  );      while  ((  a     =     geekline  .  read  ())     !=     -  1  )      {      // So we convert each integer value to char      c     =     (  char  )  a  ;          // Use of setLineNumber() : to set the line no.      geekline  .  setLineNumber  (  100     +     b  );      // getLineNumber() : returning the current line no.      a     =     geekline  .  getLineNumber  ();      System  .  out  .  println  (  c     +     ' Line No. Set : '     +     a  );      b  ++  ;      }      }      catch  (  Exception     e  )      {      // In case of error      e  .  printStackTrace  ();      System  .  out  .  println  (  'ERROR Occurs '  );      }      finally      {      // Closing the streams Once the End of Input Stream is reached      if  (  geekinput     !=     null  )      geekinput  .  close  ();      if  (  geekline     !=     null  )      geekline  .  close  ();      }      }   }

ال ABC.txt الملف المستخدم في البرنامج يحتوي على :

LineNumber

الإخراج :

L Line No. Set : 100 i Line No. Set : 101 n Line No. Set : 102 e Line No. Set : 103 N Line No. Set : 104 u Line No. Set : 105 m Line No. Set : 106 b Line No. Set : 107 e Line No. Set : 108 r Line No. Set : 109

بناء الجملة :

public long skip(long arg)   Parameters :    arg : no. of bytes of Input Stream data to skip.   Return :    no. of bytes to be skipped   Exception:    IOException : in case I/O error occurs

تطبيق :

Java

    // Java program illustrating the working of setLineNumber() method   import     java.io.*  ;   public     class   NewClass   {      public     static     void     main  (  String  []     args  )     throws     IOException      {      // LineNumberInputStream & FileInputStream initially null      LineNumberInputStream     geekline     =     null  ;      FileInputStream     geekinput     =     null  ;      try  {      char     c  ;      int     a       b     =     0  ;      // New InputStream : 'ABC' is created      geekinput     =     new     FileInputStream  (  'ABC.txt'  );      geekline     =     new     LineNumberInputStream  (  geekinput  );      while  ((  a     =     geekline  .  read  ())     !=     -  1  )      {      // So we convert each integer value to char      c     =     (  char  )  a  ;      // skip() : to skip and discard 'arg' bytes      // Here skip() will skip and discard 3 bytes.      geekline  .  skip  (  3  );      System  .  out  .  println  (  c  );      }      }      catch  (  Exception     e  )      {      // In case of error      e  .  printStackTrace  ();      System  .  out  .  println  (  'ERROR Occurs '  );      }      finally  {      // Closing the streams Once the End of Input Stream is reached      if  (  geekinput     !=     null  )      geekinput  .  close  ();      if  (  geekline     !=     null  )      geekline  .  close  ();      }      }   }

ال ABC.txt الملف المستخدم في البرنامج يحتوي على :

Program Explaining Skip() method

الإخراج : '

P r E a n k ) t

بناء الجملة :

public int read(byte[] buffer int offset int maxlen)   Parameters :    buffer : buffer whose data to read offset : starting offset of the data maxlen : max. no. of bytes to read   Return :    total no. of bytes else return -1 if End of Input Stream is identified   Exception:    IOException : in case I/O error occurs

تطبيق :

Java

    // Java program illustrating the working of read() method   import     java.io.*  ;   public     class   NewClass   {      public     static     void     main  (  String  []     args  )     throws     IOException      {      // LineNumberInputStream & FileInputStream initially null      LineNumberInputStream     geekline     =     null  ;      FileInputStream     geekinput     =     null  ;      try  {      char     c  ;      int     a  ;      // New InputStream : 'ABC' is created      geekinput     =     new     FileInputStream  (  'ABC.txt'  );      geekline     =     new     LineNumberInputStream  (  geekinput  );      // read() method returning Bytes of Input Stream as integer      // '-1' indicating to read till end Of Input Stream      while  ((  a  =  geekline  .  read  ())  !=-  1  )      {      // Since read() method returns Integer value      // So we convert each integer value to char      c     =     (  char  )  a  ;      System  .  out  .  print  (  c  );      }      }      catch  (  Exception     e  )      {      // In case of error      e  .  printStackTrace  ();      System  .  out  .  println  (  'ERROR Occurs '  );      }      finally      {      // Closing the streams Once the End of Input Stream is reached      if  (  geekinput     !=     null  )      geekinput  .  close  ();      if  (  geekline     !=     null  )      geekline  .  close  ();      }      }   }

ال ABC.txt الملف المستخدم في البرنامج يحتوي على :

Read() method

ما تفعله الطريقة هو الإزاحة = r و maxlen = 5... لذا --- أي 3 إزاحة ثم 5 بايت، أي قراءة (ثم إزاحة مرة أخرى -
الإخراج :

The number of char read: 5 ---Read(--

بناء الجملة :

public void mark(int arg)   Parameters :   arg : integer specifying the read limit of the input Stream   Return :   void

بناء الجملة :

public void reset()   Parameters :   ----   Return :   void   Exception :   ->   IOException :   If I/O error occurs.

برنامج جافا يشرح أساليب فئة LineNumberInputStream: إعادة تعيين () وعلامة ()

Java

    // Java program illustrating the working of LineNumberInputStream method   // mark() and reset()   import     java.io.*  ;   public     class   NewClass   {      public     static     void     main  (  String  []     args  )     throws     Exception      {      LineNumberInputStream     geekline     =     null  ;      FileInputStream     geek     =     null  ;      try  {      geek     =     new     FileInputStream  (  'GEEKS.txt'  );      geekline     =     new     LineNumberInputStream  (  geek  );      // read() method : reading and printing Characters one by one      System  .  out  .  println  (  'Char : '     +     (  char  )  geekline  .  read  ());      System  .  out  .  println  (  'Char : '     +     (  char  )  geekline  .  read  ());      System  .  out  .  println  (  'Char : '     +     (  char  )  geekline  .  read  ());      // mark() : read limiting the 'geek' input stream      geekline  .  mark  (  0  );      // skip() : it results in reading of 'e' in G'e'eeks      geekline  .  skip  (  1  );      System  .  out  .  println  (  'skip() method comes to play'  );      System  .  out  .  println  (  'mark() method comes to play'  );      System  .  out  .  println  (  'Char : '     +     (  char  )  geekline  .  read  ());      System  .  out  .  println  (  'Char : '     +     (  char  )  geekline  .  read  ());      System  .  out  .  println  (  'Char : '     +     (  char  )  geekline  .  read  ());      boolean     check     =     geekline  .  markSupported  ();      if  (  geekline  .  markSupported  ())      {      // reset() method : repositioning the stream to marked positions.      geekline  .  reset  ();      System  .  out  .  println  (  'reset() invoked'  );      System  .  out  .  println  (  'Char : '     +     (  char  )  geekline  .  read  ());      System  .  out  .  println  (  'Char : '     +     (  char  )  geekline  .  read  ());      }      else      {      System  .  out  .  println  (  'reset() method not supported.'  );      }      System  .  out  .  println  (  'geekline.markSupported() supported reset() : '         +     check  );      }      catch  (  Exception     except  )      {      // in case of I/O error      except  .  printStackTrace  ();      }      finally      {      // releasing the resources back to the GarbageCollector when closes      if  (  geek     !=     null  )      geek  .  close  ();      if  (  geekline     !=     null  )      geekline  .  close  ();      }      }   }

ملحوظة :
لن يتم تشغيل هذا الرمز على IDE عبر الإنترنت حيث لا يوجد مثل هذا الملف هنا.
يمكنك تشغيل هذا الرمز على نظامك للتحقق من العمل.

ABC.txt الملف المستخدم في التعليمات البرمجية لديه

HelloGeeks

الإخراج :

Char : H Char : e Char : l skip() method comes to play mark() method comes to play Char : o Char : G Char : e reset() method not supported. geekline.markSupported() supported reset() : false

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