Supermarkets use ________ to scan codes printed on product containers.
A. OCR readers
B. RFID microchips
C. bar code readers
D. photoelectric cells
Answer: C
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Analyze the following code.
``` class Test { public static void main(String[] args) { StringBuilder strBuf = new StringBuilder(4); strBuf.append("ABCDE"); System.out.println("What's strBuf.charAt(5)? " + strBuf.charAt(5)); } }``` a. The program has a compile error because you cannot specify initial capacity in the StringBuilder constructor. b. The program has a runtime error because because the buffer's capacity is 4, but five characters "ABCDE" are appended into the buffer. c. The program has a runtime error because the length of the string in the buffer is 5 after "ABCDE" is appended into the buffer. Therefore, strBuf.charAt(5) is out of range. d. The program compiles and runs fine.
A ____ operator allows you to perform arithmetic operations with a variable and store the results back to that variable.
A. logical B. rational C. compressed D. compound
Key fields link data together in a database.
Answer the following statement true (T) or false (F)
Which of the following is true about abstract classes?
A. they are the same as a class interface B. the are always a subclass of a superclass C. they are not normally instantiated in client applications D. they are used as concrete classes by client applications