Java StringWriter klass skapar en sträng från karaktärerna i String Buffer-strömmen. Metoder för StringWriter-klassen i Java kan också anropas efter att strömmen stängts eftersom detta inte kommer att leda till något IO-undantag. 

Deklaration i Java StringWriter Class

public class StringWriter extends Writer

Konstruktörer i StringWriter Class i Java

Konstruktörer som används i String Writer Class i Java nämns nedan:

StringWriter() :Skapar en ny StringWriter med den initiala eller standardstorleken för String BufferStringWriter(int storlek):Skapar en ny StringWriter med den nämnda storleken på String Buffer

Metoder i Java StringWriter Class 

Alla metoder som är involverade i Java StringWriter-klassen nämns nedan:

1. skriv(int char)

java.io.StringWriter.write(int char) skriver ett enda tecken till String Buffer. 

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

2. skriv(String str)

java.io.StringWriter.write(String str) skriver sträng till strängbufferten. 

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

3. skriv(Sträng str int offset int maxlen)

java.io.StringWriter.write(String str int offset int maxlen) skriver någon del av strängen till String Buffer. 

  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. write(char[] carray int offset int maxlen)

java.io.StringWriter.write(char[] carray int offset int maxlen) skriver någon del av karaktärsuppsättningen till String Buffer. 

  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() returnerar värdet på String Buffer som en sträng.

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

6. stäng()

java.io.StringWriter.close() stänger String Buffer. Eftersom metoden också kan anropas efter stängning av strängbufferten så spelar den ingen roll. 

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

7. append(char Sw)

java.io.StringWriter.append(char Sw) lägger till ett enstaka tecken i strängbufferten. 

  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) lägger till specificerad teckensekvens till strängbufferten. 

  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) lägger till specificerad del av en teckensekvens till strängbufferten. 

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  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. flush()

java.io.StringWriter.flush() rensar StringWriter-strömmen.

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

11. getBuffer()

java.io.StringWriter.getBuffer() returnerar String-bufferten för StringWriter. 

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

Exempel

Java-program som illustrerar användningen av StringWriter-klassmetoder: 

ersätt sträng i strängjava

// 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());  } } 

Produktion

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

Java-program som illustrerar användningen av StringWriter-klassmetoder: 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());  } } 

Produktion

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