Computer Science > QUESTIONS & ANSWERS > UNIT_17_TEST.docx. Coding criteeria. Accurate programs. Download to score A (All)

UNIT_17_TEST.docx. Coding criteeria. Accurate programs. Download to score A

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Which of the following code segments could fill /* blank */ so the code would add the first and third element of list? ArrayList<Object> list = new ArrayList<Object>(); list.add(5); list.add("abc" ... ); list.add(4); list.add(1.2); list.add('a'); list.add("10"); int i = /* blank */ a. list.get(0) + list.get(2); b. list.get(1) + list.get(3); c. (int)(list.get(0)) + (int)(list.get(2)); d. (int)list.get(0) + (int)list.get(2); e. more than one of these 2. What is output by the code below? String[] ray; ray = new String[4]; ray[1] = "one"; ray[2] = "two"; ray[3] = "three"; ray[0] = ray[2]; ray[2] = null; System.out.println( ray[0] ); a. one b. two c. three d. null e. 0 © A+ Computer Science – www.apluscompsci.com © A+ Computer Science – www.apluscompsci.com 3. Which of the descriptions provided below describes the best way to improve the code shown below to ensure that all of the occurrences of string one will be removed? public static void removeAllOnes(ArrayList<String> all) { int spot = all.size() - 1; while ( spot > 0 ) { if( all.get(spot).equals("one") ) all.remove(spot); spot--; } } a. Change the while loop to a for loop. b. Change the while loop to an in if statement. c. Add an else before spot-- in the loop. d. Change the while loop condition to ( spot >= 0 ) e. Change spot-- to spot++. 4. What is output by the code below? List<String> bigList = new ArrayList<String>(); bigList.add(0,"one"); bigList.add("two"); bigList.add(0,"three"); bigList.add("four"); bigList.add(0,"five"); bigList.set(2,"six"); bigList.set(3,"seven"); out.println( bigList.indexOf("three") ); a. 2 b. 1 c. 0 d. 4 e. 5 © A+ Computer Science – www.apluscompsci.com © A+ Computer Science – www.apluscompsci.com 5. What is output by the code below? List<String> badList = new ArrayList<String>(); badList.add(0,"one"); badList.add("two"); badList.set(0,"three"); badList.add(1,"four"); badList.set(1,"five"); out.println( badList.get(0) ); a. one b. two c. three d. four e. five 6. What is output by the code below? List<String> list = new ArrayList<String>(); list.add("one"); list.add(0,"two"); list.set(0,"three"); list.add(1,"four"); list.set(2,"five"); System.out.println(list [Show More]

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