C:\>javac HelloWorld.javaC:\>java HelloWorld
Exception in thread "main" java.lang.UnsupportedClassVersionError: HelloWorld (U
nsupported major.minor version 50.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)C:\>
Exception in thread "main" java.lang.UnsupportedClassVersionError: HelloWorld (U
nsupported major.minor version 50.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)C:\>
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这句话是什么意思啊?是哪里出了错误啊?ClassVersionError是版本出错吗?我刚从SUN网站上下载了最新的jdk和jre安装了也是报一样的错误啊!之前用的是jdk1.5也是报这个错!到底是哪里出了错啊!
文件内容:
public class HelloWorld
{
public static void main(String[] args)
{
System.out.println("HelloWorld!");
}
}
文件完整路径:C:\HelloWorld.java
错误信息:
C:\>javac HelloWorld.javaC:\>java HelloWorld
Exception in thread "main" java.lang.UnsupportedClassVersionError: HelloWorld (U
nsupported major.minor version 50.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source)C:\>
和
javac -version
得到的应该不是同一个版本号吧?
我的在d:\java\jdk1.6.0java_home(变量名) = d:\java\jdk1.6.0
classpath(变量名) = .\;d:\java\jdk1.6.0\lib\tools.jar;d:\java\jdk1.6.0\lib\dt.jar;d:\java\jdk1.6.0\lib
path=d:\java\jdk1.6.0\bin直接保存个文件吧,以后如果重装复制粘贴就行了,省的敲半天键盘,还容易敲错调试也是找个IDE的好,工欲善其事,必先利其器嘛
java version "1.4.2_03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_03-b02)
Java HotSpot(TM) Client VM (build 1.4.2_03-b02, mixed mode)javac -version
javac 1.5.0
javac: no source files
Usage: javac <options> <source files>文件名:HelloWorld.java
文件内容:
public class HelloWorld
{
public static void main(String[] args)
{
System.out.println("HelloWorld!");
}
}
文件完整路径:C:\HelloWorld.java
错误信息:
C:\>javac HelloWorld.java C:\>java HelloWorld
Exception in thread "main" java.lang.UnsupportedClassVersionError: HelloWorld (U
nsupported major.minor version 50.0)
at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(Unknown Source)
at java.security.SecureClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.defineClass(Unknown Source)
at java.net.URLClassLoader.access$100(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClassInternal(Unknown Source) C:\>
java version "1.4.2_03"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_03-b02)
Java HotSpot(TM) Client VM (build 1.4.2_03-b02, mixed mode) javac -version
javac 1.5.0 你是怎么装的啊。jdk和jre版本竟不一样。