//PROGRAM 11-31
class DemoReplace1 { 
  public static void main(String[] args) { 
    
    StringBuffer sb = new StringBuffer("Java");
    
    sb.replace(1, 2, "o");
    sb.replace(2, 3, "w");
    sb.replace(3, 4, "o");
    
    System.out.println(sb.toString());    
  } 
}