The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.
See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.
See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.
Security functions help you to protect your programs and data from harm, to keep data shielded and private, and to deploy new applications in security-aware runtime environments.
Java also provides several tools to help you to manage access to system resources; to create, store and maintain encrypted public and private passwords (key pairs) and certificates; and to create and sign jarfiles during the deployment process.