could find the main class：cz.vity.freerapid.core.MainApp.Program will exit.怎么解决

hiisi1.6.3为什么出现could not find the main class.program will exit. could find the main class：cz.vity.freerapid.core.MainApp.Program will exit.怎么解决 java初学者：Could not find the main class?按书上说的编了一个：public class DisplayWindom {//main():应用程序入口public static void main(String[] args) {System.out.print(邓小平说：);System.out.println(不管白猫、黑猫, could not find the main class.profram will exit 异常导入的包import java.io.FileInputStream;import org.apache.poi.poifs.filesystem.POIFSFileSystem; import org.apache.poi.hssf.usermodel.HSSFWorkbook; import org.apache.poi.hssf.usermodel.HSSFSheet you could not find a ture friend in the corner Could you find that storybook on the s------? 翻译此句子again he could not find the place . Find the name of a dinosaur that could fly. they gathered him all the dry stiks they could find. If I could find the words I would speak them could not find the sims data directory急用 He raised the question of whether we could find the necessary money.为什么用could you could not find the pot of gold,nor could you ever find its end求翻译 The girl looked around but could find nobody she could ask for help.的翻译. the main could not find object Could not find process the girl is unable to find so she baganto do everything[]moneyA、she could to makeB、she could to takeC、which she could makeD、whatshe could spend