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problem 1: The purpose of this problem is to practice using ArrayLists.prepare a Java client file containing a mainmethod plus other methods as needed to solve the following problem (no class definition file is to be used). (Remember to solve this problem by calling a number of methods, rather than writing large code segments)

A) Generate 30 random numbers between 1 and 1000 inclusive and store these in 2 different Array Lists simultaneously as described below:

a) each ArrayList should be created using the default size (of 10)

b) the first ArrayList should hold the random numbers in the order they are generated (so it will need to automatically expand to accommodate the data)

c) the second ArrayList should hold the random numbers in sorted order. This will be accomplished by inserting each element as it is generated into the second ArrayList using a modified version of the insertion sort code we studied in class

  • make a method that contains your modified insertion sort code.  Your code should work with an ArrayList, not a Comparable[ ].

B) Display the 2 ArrayLists, hopefully demonstrating that your modified insertion sort works (note the first arraylist will display the unsorted data, while the 2ndarraylist should be sorted)

C) Create another method that will perform a selection sort on an arraylist and send it the first (unsorted) arraylist. This method should contain a modified version of the selection sort code we discussed in class; the code is modified to use an arraylist rather than a comparable[ ].

problem 2: The purpose of this problem is to practice using generics.

A) Create a generic class with a type parameter that simulates drawing an item at random out of a box. For ex the box might contain Strings representing names written on a slip of paper, or the box might contain Integers representing a random drawing for a lottery. Include the following methods in your generic class, along with any other methods you’d like:

a) an add( ) method that allows the user to add an object of the specified type.
b) an isEmpty( ) method to determine if the box is empty.
c) adrawItem( ) method that randomly selects an object from the box and returns it.  Return null if the box is empty.

B) In the driver file that tests your class create 2 boxes, one with the names of 7 friends, the other with numbers between 1 and 5 representing the amount of hours of home work you will do before going to the party you’ve been invited to. Use the add( ) methods to populate the 2 boxes, and the drawItem( ) methods for each box to determine i) how many hours of home work you will do before ii) going to the party with the friend you will invite (from the “friends” box)

Java, Programming

  • Category:- Java
  • Reference No.:- M91800

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