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JAVA Tutorial- Do's and Don'ts of Java programming

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Keshav Kumar

Whether you program regularly in Java, and know it like the back of your hand, or whether you’re new to the language or a casual programmer, you’ll make mistakes. The purpose of this webinar is to talk about some Do's and Don'ts of Java programming. The webinar will cover the following areas: - Top 10 mistakes made by Java programmers – How to avoid them - Core Java- Best Practices – This covers good and bad practices both - How to prepare for Java Interviews and Sun Java Exams - Q&A Key learnings from this webinar: - It will benefit both junior and senior java professionals so that they don’t make common errors - Clarity of concepts of Java - Better awareness of best practices of Java

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Dr Java Workshop – By Satyarth Gaur We will cover the following areas:  - Top 10 mistakes made by Java programmers – How to avoid them    - Core Java- Best Practices – This covers good and bad practices both - How to prepare for Java Interviews and Sun Java Exams
Top Ten Errors Java Programmers Make SATYARTH GAUR [email_address]
Accessing non-static member variables from static methods (such as main) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Contd.. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Mistyping the name of a method when overriding ,[object Object]
Comparison assignment (  = rather than == ) ,[object Object]
Comparing two objects ( == instead of .equals) ,[object Object],[object Object],[object Object],[object Object],[object Object]
Confusion over passing by value, and passing by reference ,[object Object]
Contd.. ,[object Object]
Writing blank exception handlers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Forgetting that Java is zero-indexed ,[object Object]
Example Contd.. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Preventing concurrent access to shared variables by threads ,[object Object]
Contd.. ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Capitalization errors ,[object Object],[object Object],[object Object]
Capitalization errors ,[object Object],[object Object],[object Object]
Null pointers ,[object Object],[object Object]
Java Best Practices Java Fundamentals & Object-Oriented Programming Dr Java Boot Camp – Satyarth Gaur
Bad Practices
Duplicate Code! ,[object Object],[object Object]
Accessible Fields ,[object Object],[object Object],[object Object],[object Object]
Using Magic Numbers ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Temporary Fields ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Initializing Strings with “new” ,[object Object],[object Object],[object Object],[object Object]
Using floats and doubles for currency calculations ,[object Object],[object Object],[object Object]
Returning null ,[object Object],[object Object],[object Object],[object Object]
 
 
Subclassing for Functionality ,[object Object],[object Object],[object Object],[object Object],[object Object]
Empty Catch Block ,[object Object]
Using Exceptions Unexceptionally ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Excessive Use of Switches ,[object Object],[object Object]
instanceof ,[object Object],[object Object],[object Object],[object Object],[object Object]
Static Methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
System.exit ,[object Object],[object Object]
Good Practices
Validate Your Parameters ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Create Defensive Copies ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Modify Strings with StringBuilder ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Favor Immutability ,[object Object],[object Object],[object Object]
Prefer “final” for Variables ,[object Object],[object Object]
Declare Variable Just Before Use ,[object Object]
Initialize Variables Whenever Possible ,[object Object],[object Object]
Follow Code Conventions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Refer to Objects by Interfaces ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Consider Using Enums instead of Constants ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Close Your I/O Streams ,[object Object],[object Object]
Design Close to Domain ,[object Object],[object Object],[object Object],[object Object]
If You Override equals() Override hashcode() ,[object Object],[object Object]
Write Self-Documenting Code ,[object Object],[object Object],[object Object]
Use Javadoc Liberally ,[object Object]
Bubble-Up Exceptions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Best Sites for Java Examples,Code Samples,Tutorials and Interview Preparation ,[object Object],[object Object],[object Object],[object Object]
Contd.. ,[object Object],[object Object],[object Object],[object Object],[object Object]

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JAVA Tutorial- Do's and Don'ts of Java programming

  • 1. Dr Java Workshop – By Satyarth Gaur We will cover the following areas:  - Top 10 mistakes made by Java programmers – How to avoid them    - Core Java- Best Practices – This covers good and bad practices both - How to prepare for Java Interviews and Sun Java Exams
  • 2. Top Ten Errors Java Programmers Make SATYARTH GAUR [email_address]
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