Check if a directory is not empty

      
import java.io.File;

public class Main {
  public static void main(String[] args) {
    File file = new File("/data");

    if (file.isDirectory()) {
      String[] files = file.list();

      if (files.length > 0) {
        System.out.println("The " + file.getPath() + " is not empty!");
      }
    }
  }
}

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Check if a directory is not empty : Directory « File Input Output « Java

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