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if(bookList == null){
//¾È¸¸µé¾î Á³À¸¹Ç·Î ¸¸µç´Ù
bookList = new Vector();
// ±¸¸Å¸ñ·ÏÀ» Â÷°îÂ÷°î ´ã±âÀ§ÇØ Vector¿¡ÀúÀå
bookList.add(book);
}
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//¹éÅÍ°¡ ¸¸µé¾î Á³´ÂÁö °Ë»ç
if(bookList == null){
//¾È¸¸µé¾î Á³À¸¹Ç·Î ¸¸µç´Ù
bookList = new Vector();
}
// ±¸¸Å¸ñ·ÏÀ» Â÷°îÂ÷°î ´ã±âÀ§ÇØ Vector¿¡ÀúÀå
bookList.add(book);
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