COP2800 – Computer Programming Using JAVA University of Florida Department of CISE Spring 2013 Lecture 14 – How to Complete Assignment 2, Part III Webpage:

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COP2800 – Computer Programming Using JAVA University of Florida Department of CISE Spring 2013 Lecture 14 – How to Complete Assignment 2, Part III Webpage:

COP2800 – Programming in JAVA Course Objectives – Basic Knowledge of Computers & Programming – Specific Knowledge of JAVA Programming – Practical Programming Projects Build Skills Today’s Class – The Concept of Number Filtering – How to Complete Assignment 2 Building Classes for Part III Adding/Modifying Methods

Review: Java Program Structure HIGH-LEVEL VIEW JAVA Units: -Packages -Classes (Instances) -Methods -Instructions -Variables PICTURE CREDIT:

Review: Java Package Structure PICTURE CREDIT:

What Is An Array? Arrays Are Regular, periodic data structures 1-D : A vector of values (1,4,37,3) 2-D : A matrix (like mailboxes at the Post Office) Arrays Are Used For Storing Values for Regular Accessibility Sorting and Searching Regularizing Variable-Length Data

Assignment 2: The “Bins” Array Two-Dimensional Array: Array Name = “Bins” // Declare array (2-D, NBins rows x 4 cols) float a2[][] = new float[NBins][3] ; Anatomy: Dimension #1 = Bin Number (from 0 to Nbins-1) Dimension #2 = Parameters: 1 – Lower Bound of Test Interval 2 – Upper Bound of Test Interval 3 – Count of Numbers in Bin

The “Bins” Array (Asn-2), cont’d Two-Dimensional Array: Array Name = “Bins” Bin Number Parameter #1 Parameter #2 Parameter #3 Lesson Learned: Arrays can be used for storing input parameters and results.

How the “Bins” Array Works Number-Line Interval Is Defined By: -- Lower BoundBins[0][0] = -- Upper Bound Bins[0][1] = Interval from -10 to 0 writ- ten as [-10,0] x =  Bin CountBins[0][2] = Bins[0][2] + 1 incremented because x = is within [-10,0].

How NumberFilter Works Number-Line Interval Defined By: -- Lower Bound Bins[0][0] = -- Upper Bound Bins[0][1] = Test Number x = Pseudocode: (for the i th Bin Bins[i][…]) if x > LowerBound AND x < UpperBound then { x is in the i th interval so we increment the i th bin_count } else we try the next value of i or get next x if bin-loop ends

This Week: Arrays and Java READING ASSIGNMENT: D. Liang: Chapters 6 & 7 By now, you should have read textbook Ch. 1-8 Today (Friday 8 Feb 2013): How to Do Assignment #2 – Part III More on Multidimensional Arrays in Java Monday 11 Feb 2013: New Topic: READ LIANG CHAPTER 9

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