[java] Create whole path automatically when writing to a new file

Use File.mkdirs():

File dir = new File("C:\\user\\Desktop\\dir1\\dir2");
dir.mkdirs();
File file = new File(dir, "filename.txt");
FileWriter newJsp = new FileWriter(file);

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Create a new line in Java's FileWriter Overwriting txt file in java Create whole path automatically when writing to a new file