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Advanced Array Data Structures in Java Programming

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This lecture focuses on advanced array data structures using methods in Java, presented by Mahmoud Rafeek Alfarra at the College of Science and Technology in Khanyounis, Palestine. It covers concepts such as one-dimensional and multidimensional arrays, their creation, initialization, and applications. The content includes practical examples, such as storing even numbers in an array and calculating their sum, alongside theoretical insights into the nature of arrays in programming. This educational material aims to enhance programming skills and understanding of data structures.

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Advanced Array Data Structures in Java Programming

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  1. MINISTRY OF EDUCATION & HIGHER EDUCATION • COLLEGE OF SCIENCE AND TECHNOLOGY (CST) • KHANYOUNIS- PALESTINE Computer Programming 2 Lecture 1: Advanced Array Data Structure Using Methods Prepared & Presented by: Mahmoud Rafeek Alfarra

  2. و من يتقِ الله ... قال ربي سبحـانه: و لو أن أهل القرى أمنوا و اتقوا لفتحنا عليهم بركات من السماء و الأرض. شريحـة ثابتـة لعلنا نحسن من خلالها أخلاقنـا و أفعالنا لنفوز يوم الامتحان الحقيقي Downloaded from http://staff.cst.ps/mfarra

  3. Out Lines Revision about Array data structure Example: Store the even elements in array What is Multidimensional Arrays? Applications !! Example: X O’s Project. Downloaded from http://staff.cst.ps/mfarra

  4. Revision about Array data structure An array is a special type of object that can hold an ordered collection of elements. The type of the elements of the array is called the base type of the array; the number of elements it holds is a fixed attribute called its length. Java supports arrays of all primitive and reference types. Downloaded from http://staff.cst.ps/mfarra

  5. Revision about Array data structure Arrays are static data structure (which means ?!!). Downloaded from http://staff.cst.ps/mfarra

  6. Revision about Array data structure To Create & initialize the one dim. array: basetype [] arrayname = new basetype[length]; Arrayname[0] = val1; Arrayname[1] = val2; Arrayname[…] = valn; Or basetype [] arrayname = { val1, val2, val3, … }; Downloaded from http://staff.cst.ps/mfarra

  7. Revision about Array data structure Examples: int [] salary = new int [3]; salary[0] = 487; salary[1] = 600; salary[2] = 894; Or int [] salary = { 487, 600, 894 }; Downloaded from http://staff.cst.ps/mfarra

  8. Example : Store even elements in array Using Procedural programming, Write a program to store the even numbers from int To int in array. Then, print the summation of the array’s elements. Downloaded from http://staff.cst.ps/mfarra

  9. import javax.swing.JOptionPane; public class SumEvenArray { public static void even (int low, int high){ int size = (high - low)/2 +2; int [] evenarr = new int [size]; int len=0; for (int i = low; i<=high; i++) { if (i%2==0){ evenarr[len] = i; len++;} } sumarr(evenarr); } public static void sumarr(int [] evenarr) { int sum=0; for (int i =0; i<evenarr.length; i++) sum= sum+evenarr[i]; JOptionPane.showMessageDialog(null, "Sum is: "+sum); } public static void main(String[] args) { even(100, 110); } } Downloaded from http://staff.cst.ps/mfarra

  10. What is Multidimensional Arrays? Multidimensional arrays with two dimensions are often used to represent tables of values consisting of information arranged in rows and columns. To identify a particular table element, we must specify two indices. By convention, the first identifies the element's row and the second its column. Downloaded from http://staff.cst.ps/mfarra

  11. What is Multidimensional Arrays? To Create & initialize the two dim. array: basetype[] [] arrayname = new basetype[r][c]; Arrayname[0] [0]= val1; Arrayname[0] [1] = val2; Arrayname[…][…] = valn; Or basetype[] [] arrayname = { {val1, val2}, {val3, …} }; Downloaded from http://staff.cst.ps/mfarra

  12. What is Multidimensional Arrays? To Create & initialize the two dim. array: int [] [] table = new int [3][2]; table[0] [0]= 3; table[0] [1] = 5; table[0] [2] = 4; table[…][…] = valn; Or int [] [] table= { {3, 5, 4}, {valn, …} }; Downloaded from http://staff.cst.ps/mfarra

  13. What is Multidimensional Arrays? Java does not support multidimensional arrays directly, but it does allow the programmer to specify one-dimensional arrays whose elements are also one-dimensional arrays. Downloaded from http://staff.cst.ps/mfarra

  14. Example : Using Procedural programming, Write a program to store the following figure (multiple of 1, 2, 3, 4 by its successors to three times). Downloaded from http://staff.cst.ps/mfarra

  15. Lets thinking now … ? How To Downloaded from http://staff.cst.ps/mfarra

  16. Next Lecture … Continue Array’s Application Downloaded from http://staff.cst.ps/mfarra

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