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class SensitiveClass {
  private char[] filename;
  private Boolean shared = false;
 
  SensitiveClass(String filename) {
    this.filename = filename.toCharArray();
  }

  final void replace() {
    if (!shared)
      for(int i = 0; i < filename.length; i++) {
    	filename[i]= 'x';
    }
  }

  final String get() {
    if (!shared) {	
      shared = true;
      return String.valueOf(filename);
    } else {
      throw new IllegalStateException("Failed to get instance");
    }
  }
  
  final void printFilename() {
    System.out.println(String.valueOf(filename));
  }
}