Ubuntu中的Java运行时错误

jagadeesh@jagadeesh-PC:~$cd Programs
jagadeesh@jagadeesh-PC:~/Programs$javac demo.java
jagadeesh@jagadeesh-PC:~/Programs$java demo
Exception in thread "main" java.lang.UnsupportedClassVersionError: demo : Unsupported major.minor version 51.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142)
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:277)
    at java.net.URLClassLoader.access$000(URLClassLoader.java:73)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:212)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:205)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:321)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:294)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:266)
Could not find the main class: demo. Program will exit.
jagadeesh@jagadeesh-PC:~/Programs$echo $CLASSPATH

jagadeesh@jagadeesh-PC:~/Programs$

我确定没有设置classpath.任何人都可以给我有关类路径,javahome等的详细说明.我在各个站点都遇到了这些术语,但我无法清楚地理解它们.我想解释一下classpath应该包含的路径以及如何执行.
谢谢.

解决方法:

不,我不认为这是类路径问题.我认为您的javac是7版,而Java是6版.

运行javac -version和java -version进行检查.然后,使用哪个javac和哪个java来计算从中运行每个对象的位置.然后要么显式运行Java 7,要么进行升级以使您到处都在运行Java 7,或者使用javac -source 1.6 -target 1.6 demo.java

标签：ubuntu,runtime-error,java
来源： https://codeday.me/bug/20191031/1976059.html