Optimize String operations : String replace « Data Type « Java

Optimize String operations


public class Main {
  public static void main(String args[]) throws Exception {
    String str = "this is a test";
    System.out.println(replaceCharAt(str, 0, 'd'));

  public static String replaceCharAt(String s, int pos, char c) {
    StringBuffer buf = new StringBuffer(s);
    buf.setCharAt(pos, c);
    return buf.toString();
//dhis is a test


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