Numerade

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Willis James

Numerade educator

Consider the following code: String[] fruits = {"doggie", "badger", "cat", "gopher"}; int i = 3; String str = "d"; for(String item : fruits) { i = item.indexOf("d") + 2; str += item.substring(i); } System.out.println(str); Assume that the loop accesses array elements in order. What is output by this code?

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Eduard Sanchez

Numerade educator

The following method is intended to remove all values from the ArrayList < Integer > aList that have the same value as val; however, this method does NOT work correctly. public void removeValue(ArrayList < Integer > aList, int val) { int i; for(i = 0; i < aList.size(); i++) { if(aList.get(i) == val) { aList.remove(i); } } } If aList initially contains 2 3 4 3 3 4 4 5 4 3 2 1 and val is equal to 3, then aList should contain 2 4 4 4 5 4 2 1 after removeValue is invoked. What does aList actually contain after removeValue is invoked? 2 4 4 4 5 4 2 1 2 4 3 4 4 5 4 2 1 2 4 4 3 4 4 5 4 2 1 2 4 3 4 4 5 4 3 2 1 2 4 3 3 4 4 5 4 3 2 1

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Eduard Sanchez

Numerade educator

Consider the following method: public int mystery(int n) { if(n > 6) { return 1 + mystery(n - 1); } return n % 3; } What is the value of mystery(10)? 4 6 8 9 10

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Eduard Sanchez

Numerade educator

Consider the method below. What would the result of test(3) be? public static int test(int n) { if (n == 0) return 3; else return 2 * test(n - 1); } 1 3 6 12 24

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Eduard Sanchez

Numerade educator

Consider an integer array, vals, which has been declared with one or more integer values. Which of the code segments updates vals so that each element contains the current value less 2? for (int v: vals) { v = v −2; } for (int m = 0; m < vals.length; m++ ) { vals[m] = vals[m] −2; } int m = 0; while (m < vals.length) { vals[m] = vals[m] − 2; } II only III only I and III II and III I, II, and III

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Eduard Sanchez

Numerade educator

Which of the following expressions is equivalent to !(a && b)? (a || b) (!a) && (!b) (a != b) (!a) || (!b) (a && b)

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Eduard Sanchez

Numerade educator

The code segment below should print "9 7 5 3 1". 1 int x = 9; 2 while (x >= 1) { System.out.print(x + " "); 3 x--; } Does it work as intended? If NOT, what code segment below would correct it? Line 3: x− = 2; Line 1: int x = 10; Line 2: while (x > 1) Line 2: while (x < 1) The code runs as expected

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Luke Humphrey

Numerade educator

Consider the code segment below. int x = 3; int y = 5; int z = 12; if (x > 0 && y <= 10) { System.out.println(y − x * z % x + y); } What would print as a result? 0 1 5 10 11

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Eduard Sanchez

Numerade educator

Consider the code block below. for (int x = 0; x < 5; x++ ) { for (int y = 1; y < x; y++ ) { System.out.print(x + " "); } } What is the result when the code executes? 1 2 3 4 1 2 2 3 3 3 4 4 4 4 2 2 3 3 4 4 2 3 3 4 4 4 2 2 2 3 3 3 4 4 4

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Willis James

Numerade educator

Consider the code block below. String str = " hi "; for (int x = 0; x < 3; x++ ) { for (int y = 1; y < 1; y++ ) { System.out.print(x + str); } } What is the result when the code executes? 2hi 2hi 2hi 3hi 2 hi 2 hi 3 hi Nothing is printed

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Lilly B.