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by walshemj 3033 days ago
Can some explain the fist example says infers the type is right there in black and white

var foo = new ArrayList<String>();

It literally says exactly what foo is !!
1 comments
kinghajj 3033 days ago
Yes, but in current Java one would have to write

ArrayList<String> foo = new ArrayList<String>()

Or, at least

List<String> foo = new ArrayList<String>()

Whereas with `var`, as you show, the compiler infers the type. Proponents of this point out exactly what you did: the type is right there, so why should the programmer have to write it twice?

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stickfigure 3033 days ago
Because nobody actually writes this twice.

n,<return>,A,r,L,<return>,S,t,r,<return>,Cmd-Option-V,<return>

The IDE autocompletes everything, extract-to-variable does most of the heavy lifting.

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ionised 3033 days ago
> List<String> foo = new ArrayList<String>()

List<String> foo = new ArrayList<>()

> so why should the programmer have to write it twice?

You wouldn't.

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