Java Java类设置 2

Java中的 CharArrayWriter 类 |设置 1

方法：

• append (char Sw) : Java.io.CharArrayWriter.append(char Sw)将单个字符附加到 Writer。
  句法：

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

• append (CharSequence char_sq) : Java.io.CharArrayWriter.append(CharSequence char_sq)将指定的字符序列附加到 Writer。
  句法：

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

• append (CharSequence char_sq, int start, int end) : Java.io.CharArrayWriter.append(CharSequence char_sq, int start, int end)将字符序列的指定部分附加到 Writer。
  句法：

  public CharArrayWriter 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

• flush() : Java.io.CharArrayWriter.flush()刷新 Writer 流
  句法：

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

• toCharArray() : Java.io.CharArrayWriter.toCharArray()从 Writer Stream 返回字符数组。
  句法：

  public char[] toCharArray()
  Parameters : 
  -----
  Return  :
  void

• reset() : Java.io.CharArrayWriter.reset()重置 Writer 缓冲区，以便它可以再次使用。
  句法：

  public void reset()
  Parameters : 
  -----
  Return  :
  void

  说明 CharArrayWriter 类方法使用的Java程序：

  // Java program illustrating the working of CharArrayWriter class methods
  // append(CharSequence char_sq), append(char Sw)
  // append(CharSequence char_sq, int start,int end)
  // flush(), reset(), toCharArray
    
  import java.io.*;
    
  public class NewClass
  {
      public static void main(String[] args) throws IOException
      {
          // Initializing String Witer
          CharArrayWriter geek_writer1 = new CharArrayWriter();
          CharArrayWriter geek_writer2 = new CharArrayWriter();
          CharArrayWriter geek_writer3 = new CharArrayWriter();
    
          char[] Sw = {'G','E','E','K','S'};
    
          for(char c: Sw)
          {
              // Use of append(char Sw) :
              geek_writer1 .append(c);
    
              System.out.println("append(char Sw) :" + geek_writer1 .toString());
          }
    
          // Using flush() method
          geek_writer1.flush();
          System.out.println("\nUsing flush() : "+ geek_writer1.toString());
          System.out.println("");
    
    
          // 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_sq,int start,int end)
          geek_writer3.append(char_sq1, 0, 3);
          geek_writer3.append(char_sq2, 3, 6);
    
          System.out.println("append(char_sq,start,end) : " + geek_writer3.toString());
          System.out.println("");
            
    
          // Use of toCharArray() :
          char[] toChar1 = geek_writer1.toCharArray();
          for (char c1 : toChar1)
          {
              System.out.println("toCharArray : "+ c1);
          }
    
          geek_writer1.reset();
          System.out.println("\nReset is invoked");
            
    
          char[] toChar2 = geek_writer1.toCharArray();
          for (char c2 : toChar2)
          {
              System.out.println("toCharArray : "+ c2);
          }
    
    
          System.out.println("\ntoCharArray not working as reset is invoked");
      }
  }
  

  输出 ：

  append(char Sw) :G
  append(char Sw) :GE
  append(char Sw) :GEE
  append(char Sw) :GEEK
  append(char Sw) :GEEKS
  
  Using flush() : GEEKS
  
  append(char_sq) : 1 Hello 1 : 2 Geeks 2
  append(char_sq,start,end) : 1 H2 G
  
  toCharArray : G
  toCharArray : E
  toCharArray : E
  toCharArray : K
  toCharArray : S
  
  Reset is invoked
  
  toCharArray not working as reset is invoked