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Mastering Number Filtering in Java: Assignment 2, Part III Overview

In this lecture, we delve into the process of completing Assignment 2, Part III for COP2800, focusing on the concept of number filtering in Java. We'll cover the structure and use of two-dimensional arrays, specifically the "Bins" array for storing lower bounds, upper bounds, and counts of numbers within intervals. Key subjects include Java program structure, the anatomy of arrays, and practical implementations of methods. Students will gain hands-on experience with multidimensional arrays, enhancing their programming skills essential for future projects.

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Mastering Number Filtering in Java: Assignment 2, Part III Overview

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  1. COP2800 – Computer Programming Using JAVA University of Florida Department of CISE Spring 2013 Lecture 14 – How to Complete Assignment 2, Part III Webpage:www.cise.ufl.edu/~mssz/JavaNM/Top-Level.html

  2. 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

  3. Review: Java Program Structure • JAVA Units: • Packages • Classes • (Instances) • Methods • Instructions • Variables HIGH-LEVEL VIEW PICTURE CREDIT: http://www.webbasedprogramming.com/JAVA-Developers-Guide/ch4.htm

  4. Review: Java Package Structure PICTURE CREDIT: http://users.soe.ucsc.edu/~charlie/book/notes/summary1-4/sld016.htm

  5. 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

  6. 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

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

  8. How the “Bins” Array Works Number-Line Interval Is Defined By: -- Lower Bound Bins[0][0] = -- Upper Bound Bins[0][1] = -10 0 x = -1.58 Interval from -10 to 0 writ-ten as [-10,0] -10 -3 -2 -1 0 1 2 3 4  Bin CountBins[0][2] = Bins[0][2] + 1 incremented because x= -1.58 is within [-10,0].

  9. How NumberFilterWorks Number-Line Interval Defined By: -- Lower Bound Bins[0][0] = -- Upper Bound Bins[0][1] = -10 0 Test Number x= -1.58 Pseudocode: (for the ith Bin Bins[i][…]) ifx>LowerBound AND x<UpperBound then { xis in the ith interval so we increment the ithbin_count } else we try the next value of ior get next x if bin-loop ends

  10. 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

  11. Happy Weekend!! Image Credit: http://www.youtube.com/channel/HCYUZ_jJ8fRpM

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