Java 7 is now available

Post by felipemnoa » Thu, Jul 28, 2011, 8:50 PM UTC

famousactress wrote: post #105

felipemnoa wrote: post #99

Earlier quoted context omitted.

There really is not much you can do to a language to make you code faster. I guess people just like the novelty of a new language.

If you mean that time spent actually coding a program is a rounding error of the time spent conceiving it, then that's an interesting point. That said.. 1. OF COURSE you can make languages that are faster or slower to write code in. 2. Trivializing anyone who jumps ship on a language as being enchanted with the 'novelty of a new language' is obnoxious and arrogant.

Post by sukuriant » Thu, Jul 28, 2011, 8:52 PM UTC

kragen wrote: post #54

Looks like this version is not open source. Is there an open-source version of Java 7? Edit: Yes! http://openjdk.java.net/ has an announcement at http://mail.openjdk.java.net/pipermail/announce/2011-July/00... . So why would anybody "accept the Oracle Binary Code License Agreement for Java SE"?

Post by dnadolny » Thu, Jul 28, 2011, 8:53 PM UTC

rkalla wrote: post #110

dnadolny wrote: post #85

Earlier quoted context omitted.

> And one that I can't get confirmation on if it's in 7 or got pushed, index-access for List and Maps I just tried it out, it didn't get added to 7. > String-in-switch (NOTE: check on performance implications of this for tight loops) I haven't checked the performance, but I tried decompiling a String switch statement: String test = "asdf"; switch (test) { case "sss": System.out.println("sss"); break; case "asdf": Sys…

Really appreciate you going through the trouble to do that and post the results so we don't need any hand-waving. This looks the same as the original proposal -- using the hashCode and final verification via equals. So in a typical case scenario you have the 1-time calculation of the String's hashCode (which is then cached by java.lang.String) and the two method calls. .equals() is the only thing that could get away…

  class Test2{
    public static void main(String[] args) {
      MyEnum en = MyEnum.ONE;
      switch (en) {
        case ONE:
          System.out.println("one"); break;
        case TWO:
          System.out.println("two"); break;
        default:
          System.out.println("default");
       }
    }
  }

  enum MyEnum {
    ONE, TWO, THREE;
  }

    public static void main(String args[])
    {
        MyEnum myenum = MyEnum.ONE;
        static class _cls1
        {

            static final int $SwitchMap$MyEnum[];

            static
            {
                $SwitchMap$MyEnum = new int[MyEnum.values().length];
                try
                {
                    $SwitchMap$MyEnum[MyEnum.ONE.ordinal()] = 1;
                }
                catch(NoSuchFieldError nosuchfielderror) { }
                try
                {
                    $SwitchMap$MyEnum[MyEnum.TWO.ordinal()] = 2;
                }
                catch(NoSuchFieldError nosuchfielderror1) { }
            }
        }

        switch(_cls1.$SwitchMap$MyEnum[myenum.ordinal()])
        {
        case 1: // '\001'
            System.out.println("one");
            break;

        case 2: // '\002'
            System.out.println("two");
            break;

        default:
            System.out.println("default");
            break;
        }
    }

Post by gmartres » Thu, Jul 28, 2011, 9:15 PM UTC

metra wrote: post #68

kragen wrote: post #54

Looks like this version is not open source. Is there an open-source version of Java 7? Edit: Yes! http://openjdk.java.net/ has an announcement at http://mail.openjdk.java.net/pipermail/announce/2011-July/00... . So why would anybody "accept the Oracle Binary Code License Agreement for Java SE"?

The OpenJDK may have more bugs. Check out [ http://stackoverflow.com/questions/1977238/why-should-i-use-... ].

Post by mattmanser » Thu, Jul 28, 2011, 9:19 PM UTC

speckledjim wrote: post #116

famousactress wrote: post #102

Earlier quoted context omitted.

@felipemnoa: Downvotes are presumably for snarky 'You must suck and reading/writing code then' comments. Isn't a positive contribution to the discussion. Also, 'making the difference' and 'being totally irrelevant' are two very different things. Programming languages matter. I'd be surprised if Mr. Spolsky disagrees.

I think it is. If people haven't learnt yet that the single most important skill you need as a programmer is being able to read any code, in any language, and take a good guess at what it does, be able to hold abstract programming concepts in your head, and match them up to random code listings you have never seen before.... Before you can write code, you need to know how to read it.