Java，UnsupportedClassVersionError.我怎样才能解决这个问题 [英] Java, UnsupportedClassVersionError. How can I fix this

问题描述

我在日食中做作业，它没有报告错误，甚至没有警告.当我尝试从终端进行编译时，出现以下错误.它可以运行并使用Eclipse进行编译.我认为这与Java版本有关吗?是否要修复它或尝试绕过它?

I was doing my homework in eclipse and it reported no errors, not even warnings. When I tried to compile it from terminal I got following error. It runs and compiles just fine with eclipse. I take it it has something to do with java version? Anyway to fix it or try to bypass it?

vedran@vedran-debian:~/java/oop/Aufgabe6$ java Test 
Exception in thread "main" java.lang.UnsupportedClassVersionError: Test : 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: Test. Program will exit.

Java版本:

java version "1.6.0_23" 
OpenJDK Runtime Environment (IcedTea6 1.11pre) (6b23~pre11-1) 
OpenJDK 64-Bit Server VM (build 20.0-b11, mixed mode) 

谢谢大家的解释.看来是java6/7问题.我刚刚用1.6编译了它，就像魅力一样.

Thank you all for your explanations. It seems to be a java6/7 issue. I just compiled it with 1.6 and it worked like charm.

推荐答案

Test.class文件已用Java 7(主要/次要版本51.0)编译，因此与Java 6(主要/次要版本50.0)不兼容.运行.在Java 6(或更早版本)中编译.java文件，或在Java 7运行时中运行.class.

The Test.class file has been compiled in Java 7 (major/minor version 51.0), so it's incompatible with the Java 6 (major/minor version 50.0) runtime. Either compile the .java file in Java 6 (or earlier), or run the .class in a Java 7 runtime.

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