Consider a database of student records for the university. What kind of data would be associated with each student? <\/p>\n
Student<\/code> which contains some student information<\/li>\n- Create students a number of students in BlueJ. Use the Inspector to examine their fields.<\/li>\n
- Use the
getName()<\/code> method to access the student’s name.<\/li>\n- Write your own accessor methods to get the address and year enrolled.<\/li>\n
- Add a field to record the student’s gender. Update the constructor to initialise this value appropriately using a parameter. Add an accessor method.<\/li>\n
- Add a field to record the student’s age. Update the constructor to initialise the age to the default value of 18.<\/li>\n
- Add a second constructor that allows you to specify an age other than the default.<\/li>\n
- Add a
static final<\/code> constant to the class for the default age, to avoid using 18 as a magic number in your code.<\/li>\n<\/ul>\nConsider designing a class representing a car in a database for a used car lot. <\/p>\n
\n- What kinds of data would be recorded about each car?<\/li>\n
- What are the types of this data?<\/li>\n
- Write a Car class representing an entry in this database. Give it:<\/li>\n
\n- Fields recording the above data.<\/li>\n
- A public constructor.<\/li>\n
- Public accessor methods to read the data.<\/li>\n<\/ol>\n<\/ul>\n
Lists<\/h3>\n\n- Create an ArrayList of strings in BlueJ using the Tools > Use Library Class…<\/strong> menu.<\/li>\n
- Right click on the list object to see the public interface<\/strong>, the list of available methods.<\/li>\n
- Double click on the object to inspect the private implementation<\/strong>, the fields internal to the list object.<\/li>\n
- Call the
size<\/code> method to check that the list is initially empty.<\/li>\n- Call the
add<\/code> method to add some names to the list.<\/li>\n- Use the inspector to see how the fields have changed.<\/li>\n
- How does the
elementData<\/code> field change as you add names to the list? What happens if you add more than 10 names?<\/li>\n- Use the
get<\/code> method to read items off the list. What happens if you try to read an item beyond the end of the list? Explain the message you receive.<\/li>\n<\/ul>\nCreate a new class called StringUtils<\/code> with the following methods:
\npublic String findLongest(ArrayList)<\/code><\/p>\nThis method should search through a list of strings to find the longest one. You can use the length()<\/code> method<\/a> on the String class to find this value.<\/p>\n