Just write below line in your main java program and it will show you all System defined properties.
Some of the important properties that we can use generally:
1. user.dir will give project root directory location.
2. java.class.path will give the classpath which class loader used to find user defined location.
3. java.home will give the current jre location you are using .
4. user.home will give user home directory location.
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