Clasa Java StringWriter creează un șir din caracterele fluxului String Buffer. Metodele clasei StringWriter din Java pot fi apelate și după închiderea fluxului, deoarece acest lucru nu va ridica nicio excepție IO. 

Declarație în Java StringWriter Class

public class StringWriter extends Writer

Constructori în StringWriter Class în Java

Constructorii utilizați în String Writer Class în Java sunt menționați mai jos:

StringWriter() :Creează un nou StringWriter folosind dimensiunea inițială sau implicită a String BufferStringWriter (dimensiune int):Creează un nou StringWriter folosind dimensiunea menționată a String Buffer

Metode din clasa Java StringWriter 

Toate metodele implicate cu clasa Java StringWriter sunt menționate mai jos:

1. scrie (int char)

java.io.StringWriter.write(int char) scrie un singur caracter în Buffer-ul șir. 

  Syntax:   public void write(int char)   Parameters :    char : int value of the character to be written.   Return :   void

2. scrie (String str)

java.io.StringWriter.write(String str) scrie șirul în Bufferul șirurilor. 

  Syntax:   public void write(String str)   Parameters :    str : string to be written to the String Buffer.   Return :   void

3. scrie (String str int offset int maxlen)

java.io.StringWriter.write(String str int offset int maxlen) scrie o parte din șir în Bufferul șirurilor. 

  Syntax:   public void write(String str int offset int maxlen)   Parameters :    str : string to be written to the String Buffer. offset : start position of the String maxlen : maximum length upto which string has to written   Return :   void

4. scrie (char[] carray int offset int maxlen)

java.io.StringWriter.write(char[] carray int offset int maxlen) scrie o parte din matricea de caractere în Buffer-ul șir. 

  Syntax:   public void write(char[] carray int offset int maxlen)   Parameters :    carray : character to be written to the String Buffer offset : start position of the character array maxlen : maximum no. of the character of the carray has to written   Return :   void

5. toString()

java.io.StringWriter.toString() returnează valoarea String Buffer-ului ca șir.

  Syntax:   public String toString()   Parameters :    -----------   Return :   string value of the String Buffer

6. închide ()

java.io.StringWriter.close() închide String Buffer. Deoarece metoda poate fi apelată și după închiderea String Buffer-ului, deci nu joacă niciun rol. 

  Syntax:   public void close()   Parameters :    -----------   Return :   void

7. adaugă (car Sw)

java.io.StringWriter.append(char Sw) adaugă un singur caracter la Buffer-ul șirurilor. 

„ce” înseamnă 10 din 100”

  Syntax:   public StringWriter append(char Sw)   Parameters :    Sw : character to be append   Return :   StringWriter

8. append(CharSequence char_sq)

java.io.StringWriter.append(CharSequence char_sq) adaugă secvența de caractere specificată la Buffer-ul șirurilor. 

  Syntax:   public StringWriter append(CharSequence char_sq)   Parameters :    char_sq : Character sequence to append.   Return :   StringWriter if char sequence is null then NULL appends to the StringWriter.

9. append(CharSequence char_sq int start int end)

java.io.StringWriter.append(CharSequence char_sq int start int end) adaugă o parte specificată a unei secvențe de caractere la Buffer-ul șirurilor. 

  Syntax:   public StringWriter append(CharSequence char_sq int start int end)   Parameters :    char_sq : Character sequence to append. start : start of character in the Char Sequence end : end of character in the Char Sequence   Return :   void

10. spălare()

java.io.StringWriter.flush() șterge fluxul StringWriter.

  Syntax:   public void flush()   Parameters :    -----   Return :   void

11. getBuffer()

java.io.StringWriter.getBuffer() returnează String Buffer-ul StringWriter. 

  Syntax:   public StringBuffer getBuffer()   Parameters :    -----------   Return :   String Buffer with its current value.

Exemplu

Program Java care ilustrează utilizarea metodelor clasei StringWriter: 

// Java program illustrating the working of StringWriter // class methods write(int char) write(String str) close() // write(String str int offset int maxlen) toString() // write(char[] carray int offset int maxlen) import java.io.*; public class NewClass {  public static void main(String[] args)  throws IOException  {  // Initializing String Writer  StringWriter geek_writer1 = new StringWriter();  StringWriter geek_writer2 = new StringWriter();  StringWriter geek_writer3 = new StringWriter();  StringWriter geek_writer4 = new StringWriter();  // Use of write(int char) : to write a character  geek_writer1.write(71);  geek_writer1.write(70);  geek_writer1.write(71);  // Use of toString() : Value written by write(int  // char)  System.out.println('Using write(int char) : '  + geek_writer1.toString());  String str = 'Hello Geeks';  // Use of write(String str) : to write string  geek_writer2.write(str);  // Value written by write(String str)  System.out.println('Using write(String str) : '  + geek_writer2.toString());  // Use of write(String str int offset int maxlen)  // : to write part of string  geek_writer3.write(str 2 4);  geek_writer3.write(str 5 6);  // Value written by write(String str int offset  // int maxlen)  System.out.println(  'Using write(str offset maxlen) : '  + geek_writer3.toString());  try {  // Use of Close() method : to close the  // geek_writer4 But no use as String Writer  // method is still working with it  geek_writer4.close();  }  catch (IOException except) {  System.out.println('ERROR');  except.printStackTrace();  ;  }  // Initializing character array  char[] carray = str.toCharArray();  // Use of write(char[] carray int offset int  // maxlen): to write part of char array  geek_writer4.write(carray 4 6);  // Value written by write(String str int offset  // int maxlen)  System.out.println(  'Using write(carray offset maxlen) : '  + geek_writer4.toString());  } } 

Ieșire

Using write(int char) : GFG Using write(String str) : Hello Geeks Using write(str offset maxlen) : llo Geeks Using write(carray offset maxlen) : o Geek

Program Java care ilustrează utilizarea metodelor clasei StringWriter: append(CharSequence char_sq) append(char Sw) append(CharSequence char_sq int startint end) flush() getgetBuffer()

// Java program illustrating the working of StringWriter // class methods append(CharSequence char_sq) append(char // Sw) append(CharSequence char_sq int startint end) // flush() getgetBuffer() import java.io.*; public class NewClass {  public static void main(String[] args)  throws IOException  {  // Initializing String Writer  StringWriter geek_writer1 = new StringWriter();  StringWriter geek_writer2 = new StringWriter();  StringWriter geek_writer3 = new StringWriter();  // Use of write(int char) : to write a character  geek_writer1.write(71);  geek_writer1.write(70);  geek_writer1.write(71);  // Use of toString() : Value written by write(int  // char)  System.out.println('Using write(int char) : '  + geek_writer1.toString());  // Using flush() method  geek_writer1.flush();  System.out.println('Using flush() : '  + geek_writer1.toString());  // Use of append(char Sw)  System.out.println('append(char Sw) : '  + geek_writer1.append(' 1GFG1'));  // Use of getBuffer() :  System.out.println('Using geek_writer1 : '  + geek_writer1.getBuffer());  // Initializing Character Sequence  CharSequence char_sq1 = '1 Hello 1';  CharSequence char_sq2 = ' : 2 Geeks 2';  // Use of append(CharSequence char_sq)  geek_writer2.append(char_sq1);  geek_writer2.append(char_sq2);  System.out.println('append(char_sq) : '  + geek_writer2.toString());  // Use of append(CharSequence char_sqint startint  // end)  geek_writer3.append(char_sq1 0 3);  geek_writer3.append(char_sq2 3 6);  System.out.println('append(char_sqstartend) : '  + geek_writer3.toString());  } } 

Ieșire

Using write(int char) : GFG Using flush() : GFG append(char Sw) : GFG 1GFG1 Using geek_writer1 : GFG 1GFG1 append(char_sq) : 1 Hello 1 : 2 Geeks 2 append(char_sqstartend) : 1 H2 G