Here are a few question-based titles, incorporating the key elements from your provided text: * Why am I Getting \'UnsupportedClassVersionError\' Despite Installing JDK7? (Directly addresse

UnsupportedClassVersionError: Resolving Java Conflict

As you've encountered the error "Exception in thread "main" java.lang.UnsupportedClassVersionError: a (Unsupported major.minor version 51.0)", it indicates a mismatch between the version of Java used to compile and run your program.

According to your observations, despite installing JDK7, your command prompt reveals Java version 1.4.2_03. This suggests that the wrong version of Java is being utilized.

To rectify this issue, execute the following command in your command line:

<code class="bash">sudo update-alternatives --config java</code>

This command will display a list of installed Java versions on your system. Select the desired version of Java (JDK7 in your case) and make it the default.

After selecting the correct version, recompile your program and attempt to run it again. This should resolve the "UnsupportedClassVersionError" and allow your program to execute properly.

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