Set character at a given index

  

public class Main {
  public static void main(String[] argv) throws Exception {
    StringBuffer buf = new StringBuffer("Java this is a test");

    int index = 15;
    buf.setCharAt(index, '.'); 
    System.out.println(buf);
  }
}
// Java this is a .est

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Set character at a given index : StringBuffer « Development Class « Java

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