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Chars in StringBuilder

Return	Method	Summary
char	charAt(int index)	Returns the char value in this sequence at the specified index.
void	setCharAt(int index, char ch)	The character at the specified index is set to ch.
void	getChars(int srcBegin, int srcEnd, char[] dst, int dstBegin)	Characters are copied from this sequence into the destination character array dst.


public class Main {
  public static void main(String[] argv) {
    StringBuilder sb = new StringBuilder();
    sb.append("java2s.com");

    char ch = sb.charAt(0);
    
    System.out.println(ch);

  }
}

The output:


public class Main {
  public static void main(String[] argv) {
    StringBuilder sb = new StringBuilder();
    sb.append("java2s.com");

   
    sb.setCharAt(0, 'J');
    
    System.out.println(sb.toString());

  }
}

The output:


Java2s.com

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