When we import a class from our own source file, we have to compile it and generate its .class file, so that we can give the classpath to the other source file which is importing. But when we import classes from java standard libraries, which are stored in the src folder of the java jdk, are they also compiled, and if yes, then where is the .class file of them????
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The src folder of the java jdk is not used/needed; its installation is optional, usually for documentation purposes. When resolving the imports, only the compiled classes (usually packed in jars) are used.
Regarding the .class files, it depends on the jre/jdk installation platform/version. For example:
jar tvf /usr/lib/jvm/java-1.8.0-openjdk-amd64/jre/lib/rt.jar | tail
109 Mon Aug 03 01:53:14 PET 2020 java/lang/Cloneable.class
233 Mon Aug 03 01:53:14 PET 2020 java/lang/reflect/Type.class
3416 Mon Aug 03 01:53:14 PET 2020 java/lang/reflect/AnnotatedElement.class
304 Mon Aug 03 01:53:14 PET 2020 java/lang/reflect/GenericDeclaration.class
34224 Mon Aug 03 01:53:14 PET 2020 java/lang/Class.class
1918 Mon Aug 03 01:53:10 PET 2020 java/lang/CharSequence.class
235 Mon Aug 03 01:53:10 PET 2020 java/lang/Comparable.class
113 Mon Aug 03 01:53:10 PET 2020 java/io/Serializable.class
18936 Mon Aug 03 01:53:10 PET 2020 java/lang/String.class
1497 Mon Aug 03 01:53:10 PET 2020 java/lang/Object.class
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does it contain all the .class files associated with all source files in src folder??? – Siddharth Parihar Oct 29 '20 at 14:47