kousen/java_8_recipes

Source code for Modern Java Recipes book from O'Reilly

java_8_recipes

Source code for Modern Java Recipes (O'Reilly, 2017)

http://shop.oreilly.com/product/0636920056669.do

For IntelliJ:

• clone repo or download zip and extract
• Use File -> Open or if not project is open, Import
• Navigate to the build.gradle file inside the project
• Click enter and accept all the defaults

For Eclipse (and Eclipse-based tools, like STS):

• Open a command prompt in the root of the unzipped project
• Type gradlew cleanEclipse eclipse (Note: if you're on a Unix-based system, including Macs, you need to use ./gradlew …)
• Wait for the dependencies to be downloaded
• Choose File -> Import… -> General -> Existing Projects into Workspace
• Navigate to the root of the project and select it

java_8_recipes's Issues

Stream "mapToInt" with "Integer::valueOf"

Hi there,

On page 119, example 5-6 we have the list of Integers "nums" and the below code to calculate the sum:

total = nums.stream().mapToInt(Integer::valueOf).sum()

Wouldn't be better to use "Integer::intValue" since valueOf takes an int primitive as argument and returns an Integer object? In this case I know the list is small so it's not a problem but just saying... what do you think?

haskell joke

https://xkcd.com/1312/