When you define a subclass, like student, and don't supply a constructor, then its superclass must: 1. have no constructors defined2. have no constructors defined or have an explicit default (no-arg) constructor defined.3. have an explicit copy constructor defined4. have an explicit default (no-arg) constructor defined5. have an explicit working constructor defined

Which of the following is not contained on the slide show toolbar? a. next button b. slide button c. close button d. pen too

The fourth generation of computers emerged between 1970s and 1980s. which technological advancement brought about this generation of computers? which computer architecture was used most in this generation?

Use a physical stopwatch to record the length of time it takes to run the program. calculate the difference obtained by calls to the method system.currenttimemillis() just before the start of the algorithm and just after the end of the algorithm. calculate the difference obtained by calls to the method system.currenttimemillis() at the start of the program and at the end of the program so that the elapsed time includes the display of the result. use the value returned by the method system.currenttimemillis() just after the end of the algorithm as the elapsed time.