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Java: How to Get the File Path Separator

Keep 'em separated.

Java NIO: How to Format FileTime

Make it look pretty.

Java NIO: How to Get the Last Modified Time From a File

Find out when it happened.

Java: How to Format a Double With DecimalFormat

When you don't need too much precision.

Java: How to Format a Double Using String.format()

Make it look the way it should.

Spring Boot: How to Upload Files With a REST API

It's just a glorified request body.

JUnit and Mockito: Why Your Mocks Aren't Injecting

One theory, anyway.

JUnit: Test Exception Conditions With assertThrows()

Make sure things go wrong the way they're supposed to go wrong.

Spring Boot: How to Handle REST API Errors

Take the time to deliver a user-friendly error response.

So What's the Difference Between ? and Object in Java Generics?

They're not the same.
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