How to run mysqldump command in java code?

I want to test to run mysqldump command in my function but I could not create aaadumpdb.sql file. My code is below:

@Test
public void dumpDB() {
    Process p = null;
    try {
        Runtime runtime = Runtime.getRuntime();
        p = runtime
                .exec("mysqldump -u root -padmin --add-drop-database aaa_db "
                        + "D:\\backupdenemeaaa " + "aaadumpdb.sql");
        // change the dbpass and dbname with your dbpass and dbname
        int processComplete = p.waitFor();

        if (processComplete == 0) {

            System.out.println("Backup created successfully!");

        } else {
            JOptionPane.showMessageDialog(new JDialog(),
                    "Could not create the backup");
        }

    } catch (Exception e) {
        e.printStackTrace();
    }

    File f = new File("aaadumpdb.sql");

    assertTrue(f.exists());
}

Can anybody give me some advice about it? Thank you.