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Solve a real-world problem using Java

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As I wrote in the first two articles in this series, I enjoy solving small problems by writing small programs in different languages, so I can compare the different ways they approach the solution. The example I'm using in this series is dividing bulk supplies into hampers of similar value to distribute to struggling neighbors in your community, which you can read about in the first article in this series.

In the first article, I solved this problem using the Groovy programming language , which is like Python in many ways, but syntactically it's more like C and Java. In the second article, I solved it in Python with a very similar design and effort, which demonstrates the resemblance between the languages.

Now I'll try it in Java .

The Java solution

When working in Java, I find myself declaring utility classes to hold tuples of data (the new record feature is going to be great for that), rather than using the language support for maps offered in Groovy and Python. This is because Java encourages creating maps that map one specific type to another specific type, but in Groovy or Python, it's cool to have a map with mixed-type keys and mixed-type values.

The first task is to define these utility classes, and the first is the Unit class:

There's nothing too startling here. I effectively created a class whose instances are immutable since there are no setters for fields item , brand , or price and they are declared private . As a general rule, I don't see value in creating a mutable data structure unless I'm going to mutate it; and in this application, I don't see any value in mutating the Unit class.

While more effort is required to create these utility classes, creating them encourages a bit more design effort than just using a map, which can be a good thing. In this case, I realized that a bulk package is composed of a number of individual units, so I created the Pack class:

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Similar to the Unit class, the Pack class is immutable. A couple of things worth mentioning here:

The sharp-eyed reader will note that, unlike in the Groovy and Python examples where I was mostly focused on compact code and spent way less time thinking about design decisions, here, I separated the definition of a Pack from the number of Pack instances purchased. Again, from a design perspective, this seemed like a good idea as the Pack is conceptually quite independent of the number of Pack instances acquired.

Given this, I need one more utility class: the Bought class:

OK! Time to move on and solve the problem. First, declare the purchased packs:

This is pretty nice from a readability perspective: there is one pack of Best Family Rice containing 10 units that cost 5,650 (using those crazy monetary units, like in the other examples). It's straightforward to see that in addition to the one bulk pack of 10 bags of rice, the organization acquired 10 bulk packs of one bag each of spaghetti. The utility classes are doing some work under the covers, but that's not important at this point because of the great design job!

Note the var keyword is used here; it's one of the nice features in recent versions of Java that help make the language a bit less verbose (the principle is called DRY —don't repeat yourself) by letting the compiler infer the variable's data type from the right-side expression's type. This looks kind of similar to the Groovy def keyword, but since Groovy by default is dynamically typed and Java is statically typed, the typing information inferred in Java by var persists throughout the lifetime of that variable.

Finally, it's worth mentioning that packs here is an array and not a List instance. If you were reading this data from a separate file, you would probably prefer to create it as a list.

Next, unpack the bulk packages. Because the unpacking of Pack instances is delegated into lists of Unit instances, you can use that like this:

This uses some of the nice functional programming features introduced in later Java versions. Convert the array packs declared previously to a Java stream, use flatmap() with a lambda to flatten the sublists of units generated by the unpack() method of the Bought class, and collect the resulting stream elements back into a list.

As in the Groovy and Java solutions, the final step is repacking the units into the hampers for distribution. Here's the code—it's not much wordier than the Groovy version (tiresome semicolons aside) nor really all that different:

Some clarification, with numbers in brackets in the comments above (e.g., [1] ) corresponding to the clarifications below:

When you run this code, the output looks quite similar to the output from the Groovy and Python programs:

The last hamper is abbreviated in contents and value.

Closing thoughts

The similarities in the "working code" with the Groovy original are obvious—the close relationship between Groovy and Java is evident. Groovy and Java diverged in a few ways in things that were added to Java after Groovy was released, such as the var vs. def keywords and the superficial similarities and differences between Groovy closures and Java lambdas. Moreover, the whole Java streams framework adds a great deal of power and expressiveness to the Java platform (full disclosure, in case it's not obvious—I am but a babe in the Java streams woods).

Java's intent to use maps for mapping instances of a single type to instances of another single type pushes you to use utility classes, or tuples, instead of the more inherently flexible intents in Groovy maps (which are basically just Map<Object,Object> plus a lot of syntactic sugar to vanish the kinds of casting and instanceof hassles that you would create in Java) or in Python. The bonus from this is the opportunity to apply some real design effort to these utility classes, which pays off at least insofar as it instills good habits in the programmer.

Aside from the utility classes, there isn't a lot of additional ceremony nor boilerplate in the Java code compared to the Groovy code. Well, except that you need to add a bunch of imports and wrap the "working code" in a class definition, which might look like this:

The same fiddly bits are necessary in Java as they are in Groovy and Python when it comes to grabbing stuff out of the list of Unit instances for the hampers, involving random numbers, loops through remaining units, etc.

Another issue worth mentioning—this isn't a particularly efficient approach. Removing elements from ArrayLists , being careless about repeated expressions, and a few other things make this less suitable for a huge redistribution problem. I've been a bit more careful here to stick with integer data. But at least it's quite quick to execute.

Yes, I'm still using the dreaded while { … } and for { … } . I still haven't thought of a way to use map and reduce style stream processing in conjunction with a random selection of units for repackaging. Can you?

Stay tuned for the next articles in this series, with versions in Julia and Go .

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Comparing how different programming languages solve the same problem is fun and instructive. Next up, Python.

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Java Programming: Solving Problems with Software

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About this Course

Learn to code in Java and improve your programming and problem-solving skills. You will learn to design algorithms as well as develop and debug programs. Using custom open-source classes, you will write programs that access and transform images, websites, and other types of data. At the end of the course you will build a program that determines the popularity of different baby names in the US over time by analyzing comma separated value (CSV) files.

After completing this course you will be able to: 1. Edit, compile, and run a Java program; 2. Use conditionals and loops in a Java program; 3. Use Java API documentation in writing programs. 4. Debug a Java program using the scientific method; 5. Write a Java method to solve a specific problem; 6. Develop a set of test cases as part of developing a program; 7. Create a class with multiple methods that work together to solve a problem; and 8. Use divide-and-conquer design techniques for a program that uses multiple methods.

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Skills you will gain



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Susan H. Rodger


Duke University

Duke University has about 13,000 undergraduate and graduate students and a world-class faculty helping to expand the frontiers of knowledge. The university has a strong commitment to applying knowledge in service to society, both near its North Carolina campus and around the world.

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Syllabus - What you will learn from this course

Introduction to the course.

Welcome to “Java Programming: Solving Problems with Software”! We are excited that you are starting our course to learn how to write programs in Java, one of the most popular programming languages in the world. In this introductory module, you will get to meet the instructor team from Duke University and have an overview of the course. Have fun!

Fundamental Java Syntax and Semantics

In this module, you will learn to write and run your first Java programs, including one program that prints “Hello!” in various countries’ languages and another where you will analyze the perimeters and other information of shapes. To accomplish these tasks, you will learn the basics of Java syntax and how to design stepwise solutions with programs. By the end of this module, you will be able to: (1) Download and run BlueJ, the Java programming environment for this course; (2) Access the documentation for the Java libraries specially designed for this course; (3) Edit, compile, and run a Java program; (4) Construct methods, variables, if else statements, and for each loops in Java; and (5) Use Iterables (like DirectoryResource) to run a program that iterates over multiples lines in a document or webpage or multiple files in a directory.

Strings in Java

This module begins with a short presentation from Raluca Gordân, an assistant professor in Duke University’s Center for Genomic and Computational Biology, about an important problem genomics scientists encounter regularly: how to identify genes in a strand of DNA. To tackle this problem, you will need to understand strings: series of characters such as letters, digits, punctuation, etc. After learning about Java methods that work with strings, you will be able to find genes within a DNA string as well as tackle other string related problems, such as finding all of the links in a web page. By the end of this module, you will be able to: (1) Use important methods for the Java String class; (2) Use conditionals, for loops, and while loops appropriately in a Java program; (3) Find patterns in the data represented by strings to help develop the algorithm for your program; (4) Understand the importance of designing programs that keep different data processing steps separate; (5) Use the StorageResource iterable for this course to store some data for further processing; and (6) Rely on Java documentation to better understand how to use different Java packages and classes.

CSV Files and Basic Statistics in Java

A common format for storing tabular data (any data organized into columns and rows) is in comma separated values (CSV) files. In this module, you will learn how to analyze and manipulate data from multiple CSV data files using a powerful open-source software package: Apache Commons CSV. Using this library will empower you to solve problems that could prove too complex to solve with a spreadsheet. By the end of this module, you will be able to: (1) Use the open-source Apache Commons CSV package in your own Java programs; (2) Access data from one or many CSV files using Java; (3) Convert strings into numbers; (4) Understand how to use “null” in Java programs (when you want to represent “nothing”); (5) Devise an algorithm (and implement in Java) to answer questions about CSV data; and (6) Analyze CSV data across multiple CSV files (for example, find maximums, minimums, averages, and other simple statistical results).

MiniProject: Baby Names

This module wraps up the course with a mini project that ties together the different practices, skills, and libraries you have gained across the course! Using data on the popularity of different baby names in the United States from the past several decades, you will be able to compare different names’ popularity over time. While the data we have collected for this course is from the United States, we welcome you to share data from other countries in the course discussion forums. Good luck with the mini project!


Being new to programming, this course was challenging, but it was well designed course and helped me with reasoning and gaining confidence with handling Methods and Loops and conditionals.

Excellent explanations and amount of course work for practice, the tests made good use of the examples and work given, I am satisfied with what I learned in this course and see it's real world usage.

The course was well structured but I feel the content could have incorporated more concepts. I feel like there's so much basic JAVA that's not covered. But otherwise the teachers did a great job.

A basic practice approach for solving problems with a 7step formula for any kind of problem set, for any kind of programming language you use. A very basic approach to JAVA syntax and semantics.

Frequently Asked Questions

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Access to lectures and assignments depends on your type of enrollment. If you take a course in audit mode, you will be able to see most course materials for free. To access graded assignments and to earn a Certificate, you will need to purchase the Certificate experience, during or after your audit. If you don't see the audit option:

The course may not offer an audit option. You can try a Free Trial instead, or apply for Financial Aid.

The course may offer 'Full Course, No Certificate' instead. This option lets you see all course materials, submit required assessments, and get a final grade. This also means that you will not be able to purchase a Certificate experience.

What will I get if I subscribe to this Specialization?

When you enroll in the course, you get access to all of the courses in the Specialization, and you earn a certificate when you complete the work. Your electronic Certificate will be added to your Accomplishments page - from there, you can print your Certificate or add it to your LinkedIn profile. If you only want to read and view the course content, you can audit the course for free.

What is the refund policy?

If you subscribed, you get a 7-day free trial during which you can cancel at no penalty. After that, we don’t give refunds, but you can cancel your subscription at any time. See our full refund policy .

Is financial aid available?

Yes. In select learning programs, you can apply for financial aid or a scholarship if you can’t afford the enrollment fee. If fin aid or scholarship is available for your learning program selection, you’ll find a link to apply on the description page.

Will I receive a transcript from Duke University for completing this course?

No. Completion of a Coursera course does not earn you academic credit from Duke; therefore, Duke is not able to provide you with a university transcript. However, your electronic Certificate will be added to your Accomplishments page - from there, you can print your Certificate or add it to your LinkedIn profile.

More questions? Visit the Learner Help Center .

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Java Programming Exercises, Practice, Solution

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Java is the foundation for virtually every type of networked application and is the global standard for developing and delivering embedded and mobile applications, games, Web-based content, and enterprise software. With more than 9 million developers worldwide, Java enables you to efficiently develop, deploy and use exciting applications and services.

The best way we learn anything is by practice and exercise questions. Here you have the opportunity to practice the Java programming language concepts by solving the exercises starting from basic to more complex exercises. A sample solution is provided for each exercise. It is recommended to do these exercises by yourself first before checking the solution.

Hope, these exercises help you to improve your Java programming coding skills. Currently, following sections are available, we are working hard to add more exercises .... Happy Coding!

List of Java Exercises:

Note: If you are not habituated with Java programming you can learn from the following :

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[ Want to contribute to Java exercises? Send your code (attached with a .zip file) to us at w3resource[at]yahoo[dot]com. Please avoid copyrighted materials.]

Do not submit any solution of the above exercises at here, if you want to contribute go to the appropriate exercise page.

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Java: How do I break out of nested loops in Java?

Like other answerers, I'd definitely prefer to put the loops in a different method, at which point you can just return to stop iterating completely. This answer just shows how the requirements in the question can be met. You can use break with a label for the outer loop. For example:

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How to improve problem solving skills in java programming.

problem solving skills in java

Most developers would agree that Java problem solving skills are one of the most important skills to have when it comes to programming. After all, what good is a developer who can’t solve problems? But even for the best Java developers, problem solving skills in java programming can be a difficult task.

That’s why we’ve put together this list of 6 easy tips to improve problem solving skills in programming (Java).

Java problem solver

What Do We Mean By Programming Problem Solving Skills?

Problem solving skills are the ability to identify and solve problems. When it comes to Java development, this means being able to find solutions to coding challenges, debugging errors, and working through difficult logic puzzles.

Java Problem Solving For Beginners (With An Example):

Let’s take a look at an example of how to use problem-solving skills in Java. Suppose you have a list of numbers, and you want to find the sum of the even numbers in that list. This is what your code might look like:

In this code, we are using a for loop to iterate through the list of numbers. We then use a conditional statement to determine if the integer passed to the conditional statement is even or not. If it is an even number, we add it to our sum variable.

Here’s how you would solve this problem without using any of the available tools in Java:

Use a for loop to iterate through each number in your list. Use modulus (%) and double-check your work to make sure that you know which numbers are even.

With a for loop, this might not look too difficult. But what happens when the problem gets more complex? What happens when you have a list of 100 or 1000 numbers instead of just 6? You would have to use nested for loops, and it could get very confusing.

Why Is Learning Problem Solving Skills In Java So Crucial?

While having adequate skills in problem-solving, Java developers can create ample amount of opportunities for themselves, like:

Problem Solving Skills In Competitive Programming

How To Improve Problem Solving Skills In Competitive Programming:

1. practice makes perfect with skills of problem solving.

The only way to get better at solving problems is by practicing. The more complex the situation, the more you will need to rely on your problem solving skills and ability to think outside the box. If you’re one of those developers that are always looking for a challenge, take online boot camps where companies post coding challenges and Java programmers compete against each other to find solutions as quickly as possible.

2. Use the Power of Google (or other dev tools)

There may be times when your code works perfectly fine but you still don’t know how it actually works. When you run into these times, don’t be afraid to use Google! There are times when a simple Google search is all you need to complete the task at hand.

3. Find a Friend for Code Reviews

If you have a colleague or friend who’s also passionate about Java development, find them and do code reviews together! Code reviews are an excellent learning experience for any developer. Not only will they help improve your skills of problem solving in Java, but they will also teach you new things that you might not know about the language.

4. Try Pair Programming

Pair programming is a great way to work through bugs and complex logic problems with another person. When coding in pairs, it becomes much easier to solve difficult problems since there are two brains working on it—and if one of those programmers knows how to solve the problem, the other one might just learn something new.

Read the Related Article – what is pair programming ?

5. Use Debuggers to Your Advantage

Debuggers are a developer’s best friend—they will save you time and headaches when it comes to debugging errors in code. If you don’t have any experience with Java debuggers, now would be a great time to try one out! Just knowing how to use a debugger can go a long way in helping you solve difficult problems.

6. Keep an Open Mind

When solving a problem, there will be some developers who try to use the “standard” way of doing things. For some problems, this might work perfectly fine—but when you’re trying to solve a difficult problem, sometimes it’s best not to follow convention and think outside the box!

Being able to solve problems is an essential skill of a web developer , but Java developers, in particular, need strong skills in problem-solving to succeed. If you’re looking for help with how to improve your problem-solving abilities in Java, start by practicing more often and using the power of Google or other dev tools when needed. You can also find friends who are passionate about programming to do code reviews together—or if you want some hands-on experience try pair programming! Debuggers will save time and headaches as well, so make sure that you know how they work before tackling difficult problems on your own. The key is practice; give these tips a shot today and see what happens!

Ans- Skills of Problem-solving in Java are the ability to identify and solve problems. This includes being able to understand the problem, come up with a solution, and then code that solution. Java developers need these skills to be successful because they often have to work on projects with tight deadlines and limited resources.

Ans- The best time to use Google is when a developer doesn’t know how to solve a problem that they’re facing. There’s almost always someone who has run into the same problem, so it’s important to know how to use Google to find other solutions.

Ans- Pair programming is a method of working on a task with another person. One developer codes while the other reviews, and together they work through the problem. It’s a great way to learn while you work, and it can be especially helpful for more difficult problems that require the knowledge of both developers.

problem solving using java programming

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Java Programming Examples

The following Java section contains a wide range of Java programs from basic to intermediate level. The examples are categorized as basic, string, array, collections, methods, list, date, and time, files, exception, multithreading, etc. Here, you will find the different approaches to solve a particular problem in Java with proper explanation.

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10 Java Code Challenges for Beginners


If you’re starting a career as a Front-End Developer , Full-Stack Developer , or Computer Scientist , then you’ve probably started learning Java . Maybe you’ve started with an online course , which is a great way to build a solid programming foundation. Once you’re familiar with the basics, try putting your Java skills to the test with some practical exercises to build on your knowledge.

One of the best features of Java is its flexibility. You may find that there are multiple ways to solve the same challenge. In fact, if you’re learning Java with a friend, try these challenges together and learn from each other by comparing your results.

If you get stuck, try thinking through the problem using pseudocode or a general description of the programming steps you’d use to solve the problem. Pseudocode is helpful because it lets you work through programming challenges without having to worry about the specific syntax of a programming language (you can worry about that later).

Below are 10 Java code challenges for beginners. The first five challenges are with strings , while the last five challenges involve numerical inputs. Let’s get started!

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10 Java code challenges to practice your new skills

1. word reversal.

For this challenge, the input is a string of words, and the output should be the words in reverse but with the letters in the original order. For example, the string “Dog bites man” should output as “man bites Dog.”

After you’ve solved this challenge, try adding sentence capitalization and punctuation to your code. So, the string “Codecademy is the best!” should output as “Best the is Codecademy!”

2. Find the word

Starting with an input string of words, find the second-to-last word of the string. For example, an input of “I love Codecademy” should return “love.”

To make your program more challenging, allow for a second numerical input, n , that results in returning the n th word of a string. So, for the string “I can program in Java” and n = 3, the output should be the third word, “program.”

3. Word search

For a given input string, return a Boolean TRUE if the string starts with a given input word. So, for an input string of “hello world” and input word “hello,” the program should return TRUE.

For a more advanced word searcher, create a program that returns the number of times a word appears in an input string. For example, given an input word “new” and an input string “I’m the new newt,” the program should return a value of 2.

4. Anagrams

Two words are anagrams if they contain the same letters but in a different order. Here are a few examples of anagram pairs:

For a given input of two strings, return a Boolean TRUE if the two strings are anagrams.

As an added challenge, for a given array of strings, return separate lists that group anagrams together. For example, the input {“tar,” “rat,” “art,” “meats,” “steam”}, the output should look something like {[“tar,” “rat,” “art”], [“meats,” “steam”]}.

5. Pangrams

A pangram is a sentence that contains all 26 letters of the English alphabet. One of the most well-known examples of a pangram is, “The quick brown fox jumps over the lazy dog.” Create a pangram checker that returns a Boolean TRUE if an input string is a pangram and FALSE if it isn’t.

For an added pangram challenge, create a perfect pangram checker. A perfect pangram is a sentence that uses each letter of the alphabet only once, such as, “Mr. Jock, TV quiz Ph.D., bags few lynx.”

6. Number reversal

This one is a technical interview favorite. For a given input number, return the number in reverse. So, an input of 3956 should return 6593.

If you’re ready for a bigger challenge, reverse a decimal number. The decimal point should stay in the same place. So, the number 193.56 should output 653.91.

7. Armstrong numbers

An Armstrong number is a whole number that’s equal to the sum of its digits raised to the power of the total number of digits. For example, 153 is an Armstrong number because there are three digits, and 153 = 13 + 53 + 33. The four-digit number 8208 is also an Armstrong number, as 8208 = 84 + 24 + 04 + 84.

Create an Armstrong number checker that returns a Boolean TRUE if the input number is an Armstrong number. Hint: to extract each digit from a given number, try using the remainder/modulo operator.

If you’re looking for something a little more challenging, create an Armstrong number calculator that returns all Armstrong numbers between 0 and the input number.

8. Product maximizer

For a given input array of numbers, find the two that result in the largest product. The output should include the two numbers in the array along with their product.

As an extra challenge, use an input of two arrays of numbers and find two numbers — one from each input array — that results in the largest product.

9. Prime number checker

A prime number is any whole number greater than 1 whose only factors are 1 and itself. For example, 7 is a prime number because it’s only divisible by 1 and 7.

Create a function that returns TRUE if an input number is prime. The first few prime numbers are 2, 3, 5, 7, 11, 13, 17, and 19.

For a slightly harder challenge, create a prime number calculator that outputs all prime numbers between 2 and the input number.

10. Prime factorization

The prime factors of a number are all of the integers below that number that are divisible into the number as well as 1. For example, the prime factors of 12 are 1,2,3,4,6, and 12.

Create a prime factorization calculator that returns the prime factors of any number between 2 and 100. If you’re looking for a more advanced version of this challenge, use exercise 9 to create a prime factorization calculator for any number. Hint: think about using square roots to cut your work in half.

Advancing your career with Java

Along with being a fun, low-stress way to test your knowledge of a programming language, code challenges play an important role in helping you prepare for the interview process . If you’re pursuing a career where knowledge of Java is expected, then you’ll be asked to complete a Java-based coding test, as well as other questions related to Java . And, the best way to prepare for that test is to practice code challenges like these.  

To find more opportunities to practice, take a look at our other Java courses , including our popular Java for Programmers course .

Whether you’re looking to break into a new career, build your technical skills, or just code for fun, we’re here to help every step of the way. Check out our blog post about how to choose the best Codecademy plan for you to learn about our structured courses, professional certifications, interview prep resources, career services, and more.

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  1. Solve a real-world problem using Java

    The Java solution · 1] canAdd = false; // [2.2. · 2] for (int o = 0; o < units.size(); o++) { // [2.2. · 3] var uo = (u + o) % units.size(); var

  2. Java Programming: Solving Problems with Software

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