The other is that using this tool, and programming in general, is not meant for beginners as it requires extensive knowledge of coding before you can even begin to use these tools properly. You will also need JDK for compiling programs afterward. The first is that JRE is just one part of a system of components that are needed to program in Java. Then, the JRE itself mainly serves as a container for these components and is responsible for facilitating their activities. Meanwhile, the JVM ensures Java applications have the resources they need to run properly. The Class Loader is responsible for correctly loading classes and connecting them with core Class Libraries.
There are basically three parts that work in the Java Runtime Environment. Together with the Java Virtual Machine and the Java Development Kit, they form a trifecta of platform components needed for developing using this particular programming language.
It provides the necessary libraries and resources that programs made using Java need to run and work properly on your computer. The file should be saved under // or maybe as /_, like $TEMP/opencv_data/12345/lena.jpg or $TEMP/opencv_data/12345_lena.jpg in this case.The Java Runtime Environment, sometimes referred to as JRE, is essentially a software layer that runs on top of your operating system.Saving to the same directory as sample is not a good idea either, because it can be in read-only directory (like /usr/share) or on a slow flash drive etc. Saving to current directory may not be very good idea, because sample can be executed from different directories. If it's not set, some environment variable should be used (like OPENCV_SAVE_DIR), and if it's empty, it could be opencv_data subdirectory inside $TEMP or something like that.
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