: Working with worker threads ( Runnable , Callable ), ExecutorService , and identifying threading problems like deadlocks or race conditions.
: Managing file systems using the java.io and java.nio.file packages. JDBC : Developing database applications using JDBC. 2. Recommended Study Resources OCP: Oracle Certified Professional Java SE 8 Pr...
: Use comprehensive resources like the Sybex OCP Study Guide by Jeanne Boyarsky and Scott Selikoff, which covers 100% of the objectives. : Working with worker threads ( Runnable ,