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+class TestDownloadManager %7B%0A%09public static void main(String%5B%5D args) %7B%0A%09%09DownloadManager dm = new DownloadManager();%0A%09%09dm.add(%22https://github.com/chrishadi/download-manager/archive/master.zip%22);%0A%09%09dm.startAll();%0A%09%7D%0A%7D%0A

Create TestDownloadManager.java