These Light Relief sections are pieces of “infotainment” about Java and the computer industry. This one is heavy on the info, and light on the 'tainment.
Sun Microsystems, the company that originated Java, started offering a Java test and pass certificate to programmers back in 1996. People take these tests for different reasons. Some companies send their employees on Java training courses and buy them this test at the end so they will have a qualification they can take away with them. Other people (like me) took the test at the invitation of the folks at Sun running the program to help them calibrate the results. Some people just like an extra qualification to put on their resume.