Replace string at given index

  

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

    int start = 27;
    int end = 28;
    buf.replace(start, end, "4"); // Java Developers v1.4
    System.out.println(buf);
  }
}

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Replace string at given index : StringBuffer « Development Class « Java

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