Create a directory; all ancestor directories must exist

   

import java.io.File;

public class Main {
  public static void main(String[] argv) throws Exception {
    boolean success = (new File("directoryName")).mkdir();
    if (!success) {
      System.out.println("Directory creation failed"); 
    }
  }
}

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Create a directory; all ancestor directories must exist : Files « File Input Output « Java

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