本文介绍了找不到主类，程序会退出的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我使用
jar cvfm MyJarName.jar manifest.txt *.class
创建了.jar文件。但当我尝试打开它时，我会弹出一个窗口，上面写着
which created the .jar file. But when I attempt to open it, I get a pop-up window that says
Could not find the main class: <ClassName>. Program will exit.
然而，当我使用
java -jar jarName.jar
在命令提示符下，它有效精细。这是怎么回事？我希望能够双击它。
in the command prompt, it works fine. What's the deal? I want to be able to just double-click it.
推荐答案
哈，我发现了问题所在。我使用jdk1.7制作了我的程序，但是我安装了jre6。我去了升级到jre7，现在工作正常：）
Ha, I found what the problem was. I made my program using jdk1.7, but I had jre6 installed. I went and upgraded to jre7, and now it works fine :)
java -jar jarname.jar
行在命令提示符下工作，因为我的java路径被设置为jdk文件夹。
line was working in the command prompt because my java path was set to the jdk folder.
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