Work on these exercises in the IntelliJ java-web-dev-exercises
project,
creating a new class for each item. You may call these classes whatever you
like, but remember to use the proper
Java naming conventions.
Create and initialize an array with the following values in a single line:
1, 1, 2, 3, 5, 8
.
Loop through the array and print out each value, then modify the loop to only print the odd numbers.
For this exercise, use the string I would not, could not, in a box. I
would not, could not with a fox. I will not eat them in a house. I will not
eat them with a mouse.
Use the split
method to divide the string at
each space and store the individual words in an array. If you need to review
the method syntax, look back at the String methods
table.
Print the array of words to verify that your code works. The syntax is:
System.out.println(Arrays.toString(arrayName));
Repeat steps 3 and 4, but change the delimiter to split the string into separate sentences.
Note
Some characters, like a period "."
, have special meanings when used with
the split
method. They cannot be used as-is for the deliminator.
To use these characters as the deliminator, we must escape their special
meanings. Instead of .split(".")
, we need to use .split("\\.")
.
Write a static method to find the sum of all the even numbers in an
ArrayList. Within main
, create a list with at least 10 integers and call
your method on the list.
Write a static method to print out each word in a list that has exactly 5 letters.
Modify your code to prompt the user to enter the word length for the search.
BONUS: Instead of creating our own list of words, what if we want to use the
string from the Array Practice section? Search “Java convert String to
ArrayList” online to see how to split a string into the more flexible
ArrayList
collection.
Make a program similar to GradebookHashMap
that does the following: