Explore
For Enterprise
Join for Free
Log In

Navegar
Pesquisar
For Enterprise
Entrar
Inscreva-se gratuitamente

StorageResource Class

Loading...

Programação em Java: solução de problemas com software

Universidade Duke

4.6 (3,053 classificações) | 130K alunos inscritos

Curso 1 de 4 no Programação orientada a objetos em Java Programa de cursos integrados

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.

Visualizar o programa do curso

Habilidades que você aprenderá

Algorithms, Problem Solving, String (Computer Science), Java Programming

Avaliações

4.6 (3,053 classificações)

5 stars
2,246 ratings
4 stars
588 ratings
3 stars
120 ratings
2 stars
35 ratings
1 star
64 ratings

CC

Mar 29, 2018

Great course, it does help to have some background knowledge in another language but it is doable without any. goes through some fun projects but also some work usable items such as CSV parsing.

DN

Aug 08, 2016

You need a little more experience in coding that just the first course, or try not to leave everything by the end of the week(as I did) to find what you need for the assignments. Great course !

Na lição

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.

Separation of Concerns5:07

StorageResource Class3:54

Coding StorageResource Class4:27

Ministrado por

Owen Astrachan
Professor of the Practice
Robert Duvall
Lecturer
Andrew D. Hilton
Associate Professor of the Practice
Susan H. Rodger
Professor of the Practice

Transcrição

Okay, now you've learned that you want to store your data in a list, so you can separate concerns. You learned you'll start out with our edu.duke.StorageResource class, which is a simplified way of doing this. What exactly is a StorageResource and how do you use it? It's a class that holds a collection of strings. You can call .add to put a string into the StorageResource. You can also use .data to get an iterable, so you can iterate over all the strings that have been put into the StorageResource you've created. There are a few more methods and you can read about them in the Dukelearntoprogram.com website where there is a document page for the StorageResource class. Let's look at an example of using it. First, we are going to declare a variable sr of type StorageResource. Once we've declared the variable sr of type StorageResource, and initialized it to a new StorageResource, we'll see that it's empty. Then we might add a string such as, Hello. Then we might add another string such as, World. And then we could iterate over all the strings in the StorageResource by writing a for-each loop and using sr.data. Let's see what happens when we step through this code. The first line declares a variable, so we'll make a box for it labeled sr. And then calling new, creates a new StorageResource. It's going to be an empty list of strings which the sr variable will refer to. We'll add the string, Hello, to the storage resources list of strings. Similarly, sr.add World, will add, World, to the list. Now, we're at the for-each loop. We're iterating over sr.data. So, we'll make a variable we're going to use to iterate. And have it refer to the first item in the StorageResource object we created. By referring to this first item in the StorageResource object, we'll be able to print it. Here it refers to the first item in the StorageResource, the string Hello. Inside the body of the loop, we print out s. So, we print that. Then, we go back to the beginning of the loop and refer to the next string in the list, in this case, World. So, we print, World, as we enter the loop. Once we've reached the end of the loop, we go back to the beginning of the loop and see that there are no more strings in the list. So we will go past the loop and we are done iterating over the elements of sr. If you want to learn more about other methods in StorageResource or you forgot about the details of the ones we discussed here. You can find the documentation for this class on Dukelearntoprogram.com. Finally, let's see what our algorithm would look like to find all the genes and put them into a StorageResource. It's pretty much what you had before, as we show here. Except, we've made three changes. First, at the beginning of the algorithm, we make an empty StorageResource to put the strings we find, the genes in. After making the empty resource, we do something to each gene we found. We add it to the StorageResource. Finally at the end, we give an answer. We use the StorageResource with all the genes in it. Rather than printing them out, this method will return a value to whatever code called it. So, the caller can use the StorageResource and the data inside it for whatever purpose they want. That could be to print it, or it could be to process that data further. Have fun with StorageResource.

Explore nosso catálogo

Registre-se gratuitamente e obtenha recomendações, atualizações e ofertas personalizadas.

Coursera provides universal access to the world’s best education, partnering with top universities and organizations to offer courses online.

© 2019 Coursera Inc. Todos os direitos reservados.

Baixar no Google Play

Coursera
Sobre
Liderança
Carreiras
Lista de cursos
Certificados
Certificados MasterTrack™
Notas
For Enterprise
For Government
For Campus

Comunidade
Learners
Partners
Developers
Beta Testers
Translators

Conectar
Blog
Facebook
LinkedIn
Twitter
Instagram
YouTube
Tech Blog

Mais
Termos
Privacidade
Ajuda
Acessibilidade
Imprensa
Contato
Diretório
Afiliados