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lambda expression template [message #1350769]

Mon, 12 May 2014 20:28

Francois Guillot

Messages: 6
Registered: February 2012

Junior Member

Hi

I wanted to check Java 8 integration with Eclipse Luna so I downloaded the M7 Luna from eclipse.org.

After configuring the JDK to jdk8u5, I started some tests.

Let's say you have a nice Runnable like

Runnable r = new Runnable() {
   @Override
    public void run() {
        System.out.println("foo");
    }
};

If you select the

new Runnable() {
  @Override
  public void run() {
    System.out.println("foo");
  }
}

block and press Ctrl-1 (Quick Fix), you get the suggestion to change it to a lambda, resulting in

Runnable r = () -> System.out.println("foo");

, which is pretty cool.

But a nicer thing whould be to actually help creating lambda expression. For instance, if you type

Runnable r = |

(with | being the cursor location) and press ctrl+Space (content-assist), I would have expected to find a "create a lambda expression from this functional interface" option in the displayed popup. But nothing new is available.

Do you know if this will be implemented in the future ? I think it might have something to do with the templates (Java/Editor/Templates in preferences) but I actually never experimented with them.

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Re: lambda expression template [message #1353423 is a reply to message #1350769]

Tue, 13 May 2014 22:45

Stephan Herrmann

Messages: 1853
Registered: July 2009

Senior Member

One problem with the proposed quick fix is: which style of lambda should be proposed?
- explicit arguments or arguments with elided types?
- expression body or block body?
Combines to 4 styles that need to be shown for you to select from.

Compare this to the net value of saved keystrokes:
expand