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How to change Java (JVM) version in Mac OS?


Recently, I had an issue to change my default JVM version in my Mac machine. I want to provide steps to change java version with Mac OS. Use below command to check current default java version:

java -version

Download required java version and install it before proceed to further.

Open terminal, and run below command:

cd /System/Library/Frameworks/JavaVM.framework/Versions/

Check where your java is installed, in general, you can find your java installation in the below location:

/System/Library/Java/JavaVirtualMachines
/Library/Java/JavaVirtualMachines/

Find the right jdk path and create a softlink as shown below: Here I am making Java 7 as default version.

rm CurrentJDK
ln -s /Library/Java/JavaVirtualMachines/jdk1.7.0_51.jdk/Contents/ CurrentJDK

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Default value of a local variables?
The local variables are not initialized to any default values. We should not use local variables with out initialization. Even the java compiler throws error.
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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