What is a String

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来自 Duke University 的课程

Java 程序设计：使用软件解题

2027 个评分

Duke University

Java 程序设计：使用软件解题

2027 个评分

课程 1（共 4 门，Specialization Object Oriented Programming in Java）

Building upon Duke’s “Programming and the Web for Beginners” course, you will grow in your ability to be a problem-solver and programmer by writing Java programs. We are excited that you've chosen to learn Java with us! You will soon be able to solve problems that you find interesting and useful by practicing a design process you will learn in this course. Java concepts presented in this course include basic control flow; object-oriented concepts including classes and methods; custom, open-source classes; and a design-implement-debug process that you can continue to leverage as you build your experience and knowledge of programming principles. The custom, open-source classes will provide a consistent application programming interface (API) so that you can write programs that access and transform images, websites, comma separated value (CSV) files and other data files using simple and accessible coding idioms built on the Java Iterable interface. You will learn to design, test, and debug programs and to find and read Java documentation that can serve as the basis for continued study of Java and programming. After completing this course you will be able to: 1. Edit, compile, and run a Java program; 2. Use conditionals and for loops appropriately in a Java program; 3. Use Java API documentation in writing programs. 4. Debug a Java program using the scientific method; 5. Develop 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 more than one method.

从本节课中

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.

What is a String2:39

Understanding Strings3:05

Developing an Algorithm5:13

Positions in Strings8:06

Translating into Code11:17

与讲师见面

Owen Astrachan
Professor of the Practice
Computer Science
Robert Duvall
Lecturer
Computer Science
Andrew D. Hilton
Associate Professor of the Practice
Electrical and Computer Engineering
Susan H. Rodger
Professor of the Practice
Computer Science

Hi, I'm Dr. Raluca Gordan.

I'm a professor in the Duke Center for Genomic and Computational Biology and

in the Department of Biostatistics and Bioinformatics.

My work is strongly based on designing and using computational algorithms, programs,

and tools, and I want to tell you just a little bit about that.

But first, I'd like you to think about the word strings.

What does an orchestra conductor think about when she hears the word strings?

What does a sailor think about the word strings?

What does a pianist think about the word strings?

Well, I'm a genome scientist, so I will tell you what

I think when I hear the word strings, and that is genomic strings.

The genome of an organism stores all the genetic information necessary to build and

maintain that organism.

This genetic information is stored as a long list, or

string, over the four-letter alphabet, A, T, C, and G.

These four characters correspond to the four DNA bases,

adenine, thymine, cytosine, and guanine.

The shear size of the genome makes it difficult, if not impossible,

to analyze by hand.

The human genome, for example, contains 3 billion characters.

That is a million times more than the characters shown here.

Thus, finding any information in the genome requires computational approaches.

In addition, the genome is complex and contains different types of information.

Computational approaches are needed to find information,

including genes, as you can see here.

Finding genes requires more than simply looking for the tags or

codons that identify the start and end of a gene.

In addition to genes, such as the ones shown here in red,

we also need to look for regulatory elements, as shown here.

We do this with computational tools and techniques.

These regulatory elements are shown here as simple

letters representing nucleotides.

But it's important to remember that these are actually bound by proteins,

called transcription factors, which help turn genes on and off.

My research is focused on identifying such regulatory elements

in the human genome using various computational approaches.

You will do similar things in this course, and

this will prepare you to become a computer scientist or

a genome scientist, depending on what your preferences are.

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