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Merging collapsible if statements increases the code's readability.

Noncompliant Code Example

if (file != null) {
  if (file.isFile() || file.isDirectory()) {
    /* ... */
  }
}

Compliant Solution

if (file != null && isFileOrDirectory(file)) { 
  /* ... */
}

private static boolean isFileOrDirectory(File file) {
  return file.isFile() || file.isDirectory();
}