let us suppose that a function f() running on the UI thread must invoke a long-running function called long_op(). Use a short code segment, show how f() can create a worker thread and...

let us suppose that a function f() running on the UI thread must invoke a long-running function called long_op(). Use a short code segment, show how f() can create a worker thread and invoke long_op() in the worker thread. Your code should use general Java concurrency constructs; do not use Android-specific concurrency constructs.