This document discusses two-dimensional arrays in Java. It begins by providing motivations for using two-dimensional arrays to represent matrices and tables. It then outlines the objectives of the chapter, which include declaring and initializing two-dimensional arrays, common operations on them like printing and summing elements, passing them as parameters to methods, and using them to solve problems like grading multiple choice tests and finding closest pairs of points. The document provides examples of declaring, initializing, accessing elements of, and performing operations on two-dimensional arrays in Java.
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1. Arrays in Java
2. Types of Arrays
3. Working with Arrays
4. Sorting in Arrays
5. Searching in Arrays
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**** Java Certification Training: https://www.edureka.co/java-j2ee-soa-training ****
This Edureka tutorial on “Arrays in Java” will talk about one of the pillars of Java fundamentals i.e Arrays. It will also take you through the various types of arrays in Java and how they are used to achieve various functionalities. Through this tutorial, you will learn the following topics:
1. Arrays in Java
2. Types of Arrays
3. Working with Arrays
4. Sorting in Arrays
5. Searching in Arrays
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An Introduction to Programming in Java: ArraysMartin Chapman
An Introduction to Programming in Java: Arrays. Last delivered in 2012. All educational material listed or linked to on these pages in relation to King's College London may be provided for reference only, and therefore does not necessarily reflect the current course content.
Sequential collection of elements of the same type
used to store a collection of data
consist of contiguous memory locations
lowest address corresponds to the first element and the highest address to the last element.
Using various data structures: Using Arrays (One Dimensional, Two Dimensional,
Jagged), Array.
ArrayList classes
Using Collections: Collection, HashTable, List, Stack, Queue, HashSet classes.
An Introduction to Programming in Java: ArraysMartin Chapman
An Introduction to Programming in Java: Arrays. Last delivered in 2012. All educational material listed or linked to on these pages in relation to King's College London may be provided for reference only, and therefore does not necessarily reflect the current course content.
Sequential collection of elements of the same type
used to store a collection of data
consist of contiguous memory locations
lowest address corresponds to the first element and the highest address to the last element.
Using various data structures: Using Arrays (One Dimensional, Two Dimensional,
Jagged), Array.
ArrayList classes
Using Collections: Collection, HashTable, List, Stack, Queue, HashSet classes.
7.1 Data types and time delay in 8051 C
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7.4 Data conversion programs in 8051 C
7.5 Accessing code ROM space in 8051 C
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JAVA EXCEPTION HANDLING
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www.technolamp.co.in
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Thus far, you have used one-dimensional arrays to model linear collections of elements. You can use a two-dimensional array to represent a matrix or a table. For example, the following table that describes the distances between the cities can be represented using a two-dimensional array.
A basic introduction to the R programming language. No prior programming knowledge needed. Download to access embedded files. Slide content includes:
Part zero: Getting started (Interacting with R)
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Part six: Logic (programming, other functions in R)
Please use the comments to list any issues with the slides or suggest improvements
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
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Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
Slack (or Teams) Automation for Bonterra Impact Management (fka Social Soluti...Jeffrey Haguewood
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This video focuses on the notifications, alerts, and approval requests using Slack for Bonterra Impact Management. The solutions covered in this webinar can also be deployed for Microsoft Teams.
Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
Generating a custom Ruby SDK for your web service or Rails API using Smithyg2nightmarescribd
Have you ever wanted a Ruby client API to communicate with your web service? Smithy is a protocol-agnostic language for defining services and SDKs. Smithy Ruby is an implementation of Smithy that generates a Ruby SDK using a Smithy model. In this talk, we will explore Smithy and Smithy Ruby to learn how to generate custom feature-rich SDKs that can communicate with any web service, such as a Rails JSON API.
Elevating Tactical DDD Patterns Through Object CalisthenicsDorra BARTAGUIZ
After immersing yourself in the blue book and its red counterpart, attending DDD-focused conferences, and applying tactical patterns, you're left with a crucial question: How do I ensure my design is effective? Tactical patterns within Domain-Driven Design (DDD) serve as guiding principles for creating clear and manageable domain models. However, achieving success with these patterns requires additional guidance. Interestingly, we've observed that a set of constraints initially designed for training purposes remarkably aligns with effective pattern implementation, offering a more ‘mechanical’ approach. Let's explore together how Object Calisthenics can elevate the design of your tactical DDD patterns, offering concrete help for those venturing into DDD for the first time!
UiPath Test Automation using UiPath Test Suite series, part 4DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 4. In this session, we will cover Test Manager overview along with SAP heatmap.
The UiPath Test Manager overview with SAP heatmap webinar offers a concise yet comprehensive exploration of the role of a Test Manager within SAP environments, coupled with the utilization of heatmaps for effective testing strategies.
Participants will gain insights into the responsibilities, challenges, and best practices associated with test management in SAP projects. Additionally, the webinar delves into the significance of heatmaps as a visual aid for identifying testing priorities, areas of risk, and resource allocation within SAP landscapes. Through this session, attendees can expect to enhance their understanding of test management principles while learning practical approaches to optimize testing processes in SAP environments using heatmap visualization techniques
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1. Insights into SAP testing best practices
2. Heatmap utilization for testing
3. Optimization of testing processes
4. Demo
Topics covered:
Execution from the test manager
Orchestrator execution result
Defect reporting
SAP heatmap example with demo
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Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
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• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
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Topics covered:
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Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
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A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
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Epistemic Interaction - tuning interfaces to provide information for AI supportAlan Dix
Paper presented at SYNERGY workshop at AVI 2024, Genoa, Italy. 3rd June 2024
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As machine learning integrates deeper into human-computer interactions, the concept of epistemic interaction emerges, aiming to refine these interactions to enhance system adaptability. This approach encourages minor, intentional adjustments in user behaviour to enrich the data available for system learning. This paper introduces epistemic interaction within the context of human-system communication, illustrating how deliberate interaction design can improve system understanding and adaptation. Through concrete examples, we demonstrate the potential of epistemic interaction to significantly advance human-computer interaction by leveraging intuitive human communication strategies to inform system design and functionality, offering a novel pathway for enriching user-system engagements.
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07slide
1. Chapter 7 Multidimensional Arrays
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
1
2. Motivations
Thus far, you have used one-dimensional arrays to model linear
collections of elements. You can use a two-dimensional array to
represent a matrix or a table. For example, the following table that
describes the distances between the cities can be represented using a
two-dimensional array.
Distance Table (in miles)
Chicago Boston New York Atlanta Miami Dallas Houston
Chicago 0 983 787 714 1375 967 1087
Boston 983 0 214 1102 1763 1723 1842
New York 787 214 0 888 1549 1548 1627
Atlanta 714 1102 888 0 661 781 810
Miami 1375 1763 1549 661 0 1426 1187
Dallas 967 1723 1548 781 1426 0 239
Houston 1087 1842 1627 810 1187 239 0
1723 1548 781 1426 0 239
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
2
3. Objectives
To give examples of representing data using two-dimensional arrays
(§7.1).
To declare variables for two-dimensional arrays, create arrays, and
access array elements in a two-dimensional array using row and column
indexes (§7.2).
To program common operations for two-dimensional arrays (displaying
arrays, summing all elements, finding min and max elements, and
random shuffling) (§7.3).
To pass two-dimensional arrays to methods (§7.4).
To write a program for grading multiple-choice questions using two-
dimensional arrays (§7.5).
To solve the closest-pair problem using two-dimensional arrays (§7.6).
To check a Sudoku solution using two-dimensional arrays (§7.7).
To use multidimensional arrays (§7.8).
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
3
4. Declare/Create Two-dimensional Arrays
// Declare array ref var
dataType[][] refVar;
// Create array and assign its reference to variable
refVar = new dataType[10][10];
// Combine declaration and creation in one statement
dataType[][] refVar = new dataType[10][10];
// Alternative syntax
dataType refVar[][] = new dataType[10][10];
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
4
5. Declaring Variables of Two-
dimensional Arrays and Creating
Two-dimensional Arrays
int[][] matrix = new int[10][10];
or
int matrix[][] = new int[10][10];
matrix[0][0] = 3;
for (int i = 0; i < matrix.length; i++)
for (int j = 0; j < matrix[i].length; j++)
matrix[i][j] = (int)(Math.random() * 1000);
double[][] x;
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
5
7. Declaring, Creating, and Initializing Using
Shorthand Notations
You can also use an array initializer to declare, create and
initialize a two-dimensional array. For example,
int[][] array = {
int[][] array = new int[4][3];
{1, 2, 3}, array[0][0] = 1; array[0][1] = 2; array[0][2] = 3;
{4, 5, 6}, Same as array[1][0] = 4; array[1][1] = 5; array[1][2] = 6;
{7, 8, 9}, array[2][0] = 7; array[2][1] = 8; array[2][2] = 9;
{10, 11, 12} array[3][0] = 10; array[3][1] = 11; array[3][2] = 12;
};
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
7
8. Lengths of Two-dimensional
Arrays
int[][] x = new int[3][4];
x
x[0][0] x[0][1] x[0][2] x[0][3] x[0].length is 4
x[0]
x[1] x[1][0] x[1][1] x[1][2] x[1][3] x[1].length is 4
x[2]
x[2][0] x[2][1] x[2][2] x[2][3] x[2].length is 4
x.length is 3
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
8
9. Lengths of Two-dimensional
Arrays, cont.
int[][] array = { array.length
{1, 2, 3}, array[0].length
{4, 5, 6}, array[1].length
{7, 8, 9}, array[2].length
{10, 11, 12} array[3].length
};
array[4].length ArrayIndexOutOfBoundsException
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
9
10. Ragged Arrays
Each row in a two-dimensional array is itself an array. So,
the rows can have different lengths. Such an array is
known as a ragged array. For example,
int[][] matrix = {
{1, 2, 3, 4, 5}, matrix.length is 5
{2, 3, 4, 5}, matrix[0].length is 5
matrix[1].length is 4
{3, 4, 5}, matrix[2].length is 3
{4, 5}, matrix[3].length is 2
{5} matrix[4].length is 1
};
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
10
12. Processing Two-Dimensional Arrays
See the examples in the text.
1. (Initializing arrays with input values)
2. (Printing arrays)
3. (Summing all elements)
4. (Summing all elements by column)
5. (Which row has the largest sum)
6. (Finding the smallest index of the largest element)
7. (Random shuffling)
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
12
13. Initializing arrays with input values
java.util.Scanner input = new Scanner(System.in);
System.out.println("Enter " + matrix.length + " rows and " +
matrix[0].length + " columns: ");
for (int row = 0; row < matrix.length; row++) {
for (int column = 0; column < matrix[row].length; column++) {
matrix[row][column] = input.nextInt();
}
}
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
13
14. Initializing arrays with random values
for (int row = 0; row < matrix.length; row++) {
for (int column = 0; column < matrix[row].length; column++) {
matrix[row][column] = (int)(Math.random() * 100);
}
}
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
14
15. Printing arrays
for (int row = 0; row < matrix.length; row++) {
for (int column = 0; column < matrix[row].length; column++) {
System.out.print(matrix[row][column] + " ");
}
System.out.println();
}
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
15
16. Summing all elements
int total = 0;
for (int row = 0; row < matrix.length; row++) {
for (int column = 0; column < matrix[row].length; column++) {
total += matrix[row][column];
}
}
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
16
17. Summing elements by column
for (int column = 0; column < matrix[0].length; column++) {
int total = 0;
for (int row = 0; row < matrix.length; row++)
total += matrix[row][column];
System.out.println("Sum for column " + column + " is "
+ total);
}
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
17
18. Random shuffling
for (int i = 0; i < matrix.length; i++) {
for (int j = 0; j < matrix[i].length; j++) {
int i1 = (int)(Math.random() * matrix.length);
int j1 = (int)(Math.random() * matrix[i].length);
// Swap matrix[i][j] with matrix[i1][j1]
int temp = matrix[i][j];
matrix[i][j] = matrix[i1][j1];
matrix[i1][j1] = temp;
}
}
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
18
19. Passing Tow-Dimensional Arrays to
Methods
PassTwoDimensionalArray
Run
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
19
20. Problem: Grading Multiple-
Choice Test
Objective: write a
Students’ Answers to the Questions:
0 1 2 3 4 5 6 7 8 9
program that grades
Student 0 A B A C C D E E A D multiple-choice test.
Student 1 D B A B C A E E A D
Student 2 E D D A C B E E A D
Student 3 C B A E D C E E A D Key to the Questions:
Student 4 A B D C C D E E A D 0 1 2 3 4 5 6 7 8 9
Student 5 B B E C C D E E A D
Student 6 B B A C C D E E A D Key D B D C C D A E A D
Student 7 E B E C C D E E A D
GradeExam Run
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
20
21. Problem: Finding Two Points
Nearest to Each Other
x y
0 -1 3
(-1, 3)
(3, 3) 1 -1 -1
2 1 1
(4, 2)
(1, 1)
3 2 0.5
4 2 -1
(2, 0.5)
5 3 3
(4, -0.5) 6 4 2
(-1, -1) (2, -1) 7 4 -0.5
FindNearestPoints Run
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
21
22. What is Sudoku?
5 3 7
6 1 9 5
9 8 6
8 6 3
4 8 3 1
7 2 6
6
4 1 9 5
8 7 9
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
22
27. Multidimensional Arrays
Occasionally, you will need to represent n-
dimensional data structures. In Java, you can create
n-dimensional arrays for any integer n.
The way to declare two-dimensional array
variables and create two-dimensional arrays can be
generalized to declare n-dimensional array
variables and create n-dimensional arrays for n >=
3.
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
27
29. Problem: Calculating Total Scores
Objective: write a program that calculates the total score for
students in a class. Suppose the scores are stored in a three-
dimensional array named scores. The first index in scores refers to
a student, the second refers to an exam, and the third refers to the
part of the exam. Suppose there are 7 students, 5 exams, and each
exam has two parts--the multiple-choice part and the programming
part. So, scores[i][j][0] represents the score on the multiple-choice
part for the i’s student on the j’s exam. Your program displays the
total score for each student.
TotalScore Run
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
29
30. Problem: Weather Information
Suppose a meteorology station records the
temperature and humidity at each hour of every day
and stores the data for the past ten days in a text file
named weather.txt. Each line of the file consists of
four numbers that indicate the day, hour, temperature,
and humidity. Your task is to write a program that
calculates the average daily temperature and humidity
for the 10 days.
1 1 76.4 0.92 10 24 98.7 0.74
1 2 77.7 0.93 1 2 77.7 0.93
... ...
10 23 97.7 0.71 10 23 97.7 0.71 Weather
10 24 98.7 0.74 1 1 76.4 0.92
(b)
(a)
Run
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
30
31. Problem: Guessing Birthday
Listing3.8, GuessBirthday.java, gives a
program that guesses a birthday. The program
can be simplified by storing the numbers in
five sets in a three-dimensional array, and it
prompts the user for the answers using a loop,
as shown in Listing 7.6. The sample run of the
program can be the same as shown in Listing
3.8.
GuessBirthdayUsingArray Run
Liang, Introduction to Java Programming, Ninth Edition, (c) 2013 Pearson Education, Inc. All
rights reserved.
31