[英]Java Applet work only on my computer?
I'm developing a Java applet that show a message box when you visit the site. 我正在开发一个Java小程序,当您访问该站点时会显示一个消息框。 This is my Java code:
这是我的Java代码:
import java.applet.Applet;
import javax.swing.JOptionPane;
public class JavaRun extends Applet {
private static final long serialVersionUID = 1L;
public void init()
{
JOptionPane.showMessageDialog(null, "hello world!");
}
}
This is the html: 这是html:
<applet width='100' height='100' code='JavaRun' archive='data.jar'>
</applet>
On my computer (that have the java SDK) it's work, but when I'm using it on my laptop that have only the standard Java, I get these errors: 在我的计算机上(具有Java SDK)可以正常工作,但是当我在仅具有标准Java的笔记本电脑上使用它时,出现以下错误:
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source) at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source) at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source) at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.plugin2.applet.Plugin2ClassLoader.loadCode(Unknown Source) at sun.plugin2.applet.Plugin2Manager.createApplet(Unknown Source) at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Exception: java.lang.UnsupportedClassVersionError: Micro : Unsupported major.minor version 51.0... enter code here
I believe You have different versions of Java environments on your computers. 我相信您的计算机上具有不同版本的Java环境。 Run this command on both computers
在两台计算机上运行此命令
java -version
And compare version numbers. 并比较版本号。 Probably should run
大概应该跑
javac -version
on Your development machine. 在您的开发机器上。 If you get different version numbers update Java runtime environment on your laptop.
如果获得不同的版本号,请在笔记本电脑上更新Java运行时环境。
UnsupportedClassVersionError: Micro : Unsupported major.minor version 51.0
UnsupportedClassVersionError:Micro:不支持的major.minor版本51.0
This is the problem. 这就是问题。 You've compiled your applet with a class version that is not supported by the JVM you're running on the other system.
您已经用另一个系统上运行的JVM不支持的类版本编译了applet。
Use the -target
flags for javac
to produce class files for a given target JVM version. 使用
javac
的-target
标志来生成给定目标JVM版本的类文件。
UnsupportedClassVersionError
rt.jar
of the target version (to use the bootclasspath
option of javac
). rt.jar
(以使用javac
的bootclasspath
选项)。
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