Who should take this course

How to use this course

Choose primitives over boxed primitives

Pick the right data type for ids

Don’t concatenate many strings

Watch out for float and double precision

Understand date and time challenges

Always use @Override

Validate parameters

Pick the scope of method responsibility carefully

Return appropriate results

Design method signatures carefully

Restrict access as much as possible

Consider using static factory methods

Design utility classes correctly

Use dependency injection

Favour immutability

Throw appropriate exceptions

Throw exceptions in if blocks

Design catch blocks carefully

Use meaningful error messages

Java 7 Use try-with-resources

Java 10 Use var correctly

Java 1421 Prefer switch expressions and pattern matching

Java 14 Use records

Follow popular naming conventions

Use libraries

Program to interfaces where appropriate

Don’t optimise code too early

Congratulations!

Follow unit test best practices

Avoid Java serialisation

Package by feature, not by layer