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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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Knowledge Centre
What is abstract class or abstract method?
We cannot create instance for an abstract class. We can able to create instance for its subclass only. By specifying abstract keyword just before class, we can make a class as abstract class.

public abstract class MyAbstractClass{

}

Abstract class may or may not contains abstract methods. Abstract method is just method signature, it does not containes any implementation. Its subclass must provide implementation for abstract methods. Abstract methods are looks like as given below:

public abstract int getLength();
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Reference: Java™ Platform Standard Ed. 7 - API Specification | Java is registered trademark of Oracle.
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