import com.jacob.com.*;
import com.jacob.activeX.*;

public class Lesson001
{
    public static void main(String[] args) {
        ActiveXComponent excelApp = new ActiveXComponent("Excel.Application");
        try {
            excelApp.setProperty("Visible",       new Variant(true));
            excelApp.setProperty("DisplayAlerts", new Variant(false)); //警告メッセージをOFF
            Dispatch workbooks  = Dispatch.get(excelApp, "Workbooks").toDispatch();
            Dispatch workbook   = Dispatch.call(workbooks, "Open", args[0], new Variant(false), new Variant(true)).toDispatch(); //ブックを読み取り専用で開く
            Dispatch worksheets = Dispatch.get(workbook, "Worksheets").toDispatch();
            for (int i=1;i<=Dispatch.get(worksheets, "Count").getInt();i++)
            {
                Dispatch sheet = Dispatch.call(worksheets, "Item", i).toDispatch();
                Variant v = Dispatch.call(sheet, "Name");
                if (!v.isNull())
                    System.out.println(v.toString());
            }
            Dispatch.call(workbook, "Close");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            excelApp.invoke("Quit", new Variant[] {});
            ComThread.Release();
        }
    }
}