CSIS 110 – Lecture 10
Homework
Problems 3.2, 3.13, 3.16, 3.18, 3.21 - You don't need to 'explain' your answers.
Due Wednesday, Feb 2.
Programming Assignment
Do the Harvester programming exercise on page 134 of the text. Due on Monday, Feb 7.
Review - String methods/operations
Concatenation (+)
Look at program that prints out first and last names - Example1.java
First, notice the nextLine() method that is part of the Scanner class. It gets all of the
characters typed by the user until they press the enter key.
What is going on in the println statement?
Now look at Example2.java - concatenation can be used in expressions outside of
println().
Be careful: Look at Example3.java - distinction between addition and concatenation.
length() method
WordLength.java
Show how it works.
Note that the method is called using an instance identifier followed by a '.' followed by
the method. This is how you call or invoke a method.
Then enter a 'word' with leading and trailing spaces.
Introduce trim() method.
charAt() method - takes an integer index as a parameter, and returns the character in that
position in the string.
Point out the Java starts counting at 0! So, s.charAt(0) is the first character in the String. I
will try to call it the 'zeroth' character. What if index is outside of the range of valid
indices?
