Answers to Self-Check Problems - Building Java Programs: A Back to Basics Approach - page 1065

System.out.println("]");
}
}
12. To make these methods process arrays of String s, you must change int[] to
String[] and replace all other occurrences of the word int with String . You must
also change any comparisons using == to comparisons using the equals method.
13. public static boolean allLess(int[] list1, int[] list2) {
if (list1.length != list2.length) {
return false;
}
for (int i = 0; i < list1.length; i++) {
if (list1[i] >= list2[i]) {
return false;
}
}
return true;
}
14. The method to swap array elements works because, unlike integers, arrays are
objects and use reference semantics. This means that changes to an array parame-
ter's elements will be seen in the original array by the caller.
15. 2 [0, 0, 1, 0]
1 [0, 0, 1, 0]
3 [0, 0, 1, 1]
2 [0, 0, 1, 1]
16. 2 [0, 1]
1 [0, 1]
1 [1, 2]
0 [1, 2]
17. public static void swapPairs(int[] list) {
for (int i = 0; i < list.length - 1; i += 2) {
swap(list, i, i + 1);
}
}
18. {20, 30, 40, 50, 60, 70, 80, 90, 100, 100}
19. {10, 10, 10, 10, 10, 10, 10, 10, 10, 10}
20. a1: {26, 19, 14, 11, 10}
a2: {1, 4, 9, 16, 25}
21. a1: {1, 3, -3, 13, -4, -24, -6, -14}
a2: {1, 1, 2, 3, 5, 8, 13, 21}