ArrayLists - Building Java Programs: A Back to Basics Approach - page 673

3. Write a method called removeEvenLength that takes an ArrayList of String s as a parameter and removes all of
the String s of even length from the list.
4. Write a method called doubleList that takes an ArrayList of String s as a parameter and replaces every String
with two of that same String . For example, if the list stores the values (“how”, “are”, “you?”) before the method is
called, it should store the values (“how”, “how”, “are”, “are”, “you?”, “you?”) after the method finishes executing.
5. Write a method called scaleByK that takes an ArrayList of integers as a parameter and replaces every integer of
value K with K copies of itself. For example, if the list stores the values (4, 1, 2, 0, 3) before the method is called, it
should store the values (4, 4, 4, 4, 1, 2, 2, 3, 3, 3) after the method finishes executing. Zeroes and negative numbers
should be removed from the list by this method.
6. Write a method called minToFront that takes an ArrayList of integers as a parameter and moves the minimum
value in the list to the front, otherwise preserving the order of the elements. For example, if a variable called list
stores (3, 8, 92, 4, 2, 17, 9), the value 2 is the minimum, so your method should modify the list to store the values
(2, 3, 8, 92, 4, 17, 9).
7. Write a method called removeDuplicates that takes as a parameter a sorted ArrayList of String s and eliminates
any duplicates from the list. For example, if the list stores the values (“be”, “be”, “is”, “not”, “or”, “question”, “that”,
“the”, “to”, “to”) before the method is called, it should store the values (“be”, “is”, “not”, “or”, “question”, “that”,
“the”, “to”) after the method finishes executing. Because the values will be sorted, all of the duplicates will be
grouped together. Assume that the ArrayList contains only String values, but keep in mind that it might be empty.
8. Write a method called removeZeroes that takes as a parameter an ArrayList of integers and eliminates any
occurrences of the number 0 from the list. For example, if the list stores the values (0, 7, 2, 0, 0, 4, 0) before the
method is called, it should store the values (7, 2, 4) after the method finishes executing.
9. Write a method called rangeBetweenZeroes that takes as a parameter an ArrayList of integers and returns the
number of indexes apart the two furthest occurrences of the number 0 are. For example, if the list stores the
values (7, 2, 0, 0, 4, 0, 9, 0, 6, 4, 8) when the method is called, it should return 6 , because the occurrences of 0 that
are furthest apart are at indexes 2 and 7, and the range 2 through 7 has six elements. If only one 0 occurs in the list,
your method should return 1 . If no 0 s occur, your method should return 0 .
10. Write a method called removeInRange that accepts three parameters, an ArrayList of String s, a beginning
String , and an ending String , and removes from the list any String s that fall alphabetically between the start
and end String s. For example, if the method is passed a list containing the elements (“to”, “be”, “or”, “not”, “to”,
“be”, “that”, “is”, “the”, “question”), “free” as the start String , and “rich” as the end String , the list's elements
should be changed to (“to”, “be”, “to”, “be”, “that”, “the”). The “or”, “not”, “is”, and “question” should be removed
because they occur alphabetically between “free” and “rich”. You may assume that the start String alphabetically
precedes the ending String .
11. Write a method called stutter that accepts an ArrayList of strings as a parameter and that replaces every string
with two of that string. For example, if the list stores the values [“how”, “are”, “you?”], after the call it should store
[“how”, “how”, “are”, “are”, “you?”, “you?”].
12. Write a method called markLength4 that accepts an ArrayList of strings as a parameter and that places a string of
four asterisks "****" in front of every string of length 4. For example, suppose that a variable called list
contains the values [“this”, “is”, “lots”, “of”, “fun”, “for”, “Java”, “coders”]. The call of markLength4(list);
should change the list to store the values [“****”, “this”, “is”, “****”, “lots”, “of”, “fun”, “for”, “****”, “Java”,
“coders”].