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A file used to keep the root certificates of signing authorities. 1  in C:\Program Files\java\jre1.8.0_102\lib\security\cacerts. in JRE 1.8.0_102 on your local Windows C: drive.  in J:\Program Files\java\jdk1.8.0_102\jre\lib\security\cacerts. in JDK 1.8.0_102 on your local Windows J: drive.
A Java package is a technique for organizing Java classes into namespaces similar to the modules of Modula, providing modular programming in Java.Java packages can be stored in compressed files called JAR files, allowing classes to be downloaded faster as groups rather than individually.o use a package's classes inside a Java source file, it is convenient to import the classes from the package with an import declaration. The following declaration. imports all classes from the java.awt.event package, while the next declaration.