Unable to switch on String in JRE7

Question

I'm on jre7 and I still can't switch on Strings. I installed jdk7 update 1 and pointed Eclipse to it but still no luck. Any idea what I'm doing wrong?

Here is a the code:

String code = "something"; switch(code) { case "xxx": dosomehting(); break; default: dosomethingelse(); break; }

The error I get:

Cannot switch on a value of type String. Only convertible int values or enum constants are permitted.

Do you have an Eclipse version which supports Java SE 7? (e.g. version 3.7 should be fine AFAIK) — Puce
– Puce, Commented Oct 20, 2011 at 18:05

MTilsted · Accepted Answer · 2011-10-20 19:00:40Z

2

I am pretty sure that Eclipse 3.7 only support jdk 1.6. You need 3.7.1 according to http://download.eclipse.org/eclipse/downloads/drops/R-3.7.1-201109091335/index.php

(Remember: Eclipse don't use suns compiler, they use their own, so installing jdk 1.7 is not enough).

Just open eclipse and select help->Check for updates. - That should upgrade you to 3.7.1

answered Oct 20, 2011 at 19:00

MTilsted

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4 Comments

amnesyc Over a year ago

In the Properties -> Java Compiler the maximum level I get for Compiler Compliance level is 1.6. So that I guess seals it. How can I update Eclipse from 3.7 to 3.7.1 ?

MTilsted Over a year ago

I added a comment about upgrading from 3.7 to 3.7.1 - It was pretty easy for me.

Patrick Over a year ago

Thanks Amnesyc, I know that this is an old thread but I just ran into this today on Eclipse 4.2.2 and looking at the compiler level fix my issue.

punita.gosar Over a year ago

I am facing the same issue for Eclipse Kepler version i.e. 4.3.

monksy · Accepted Answer · 2011-10-20 18:05:21Z

1

It sounds like you're still trying to compile under the old JDK [6 or earlier] Install the JDK, and make sure your Eclipse settings reflect the new platform. Additionally check if your project is reflecting the JDK7 platform.

answered Oct 20, 2011 at 18:05

monksy

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2 Comments

amnesyc Over a year ago

What I've done is change the buil path and make it point to the new jre that's in the jdk7. Now Eclipse shows JRE System Library [jdk1.7.0_01] in the build path. What else do I need to do? Is there some way to change the compiler being used?

monksy Over a year ago

If there is a way, try to get eclipse to run javac -version or the ilk as a post or pre compile step. I don't use eclipse so I can't give you exact details. However, Netbeans/IDEA use a "platform selection" [like VS] type interface to switch between the java platforms/versions

Michael Berry · Accepted Answer · 2011-10-20 18:20:23Z

Three things spring to mind to check:

Make sure that Eclipse isn't still pointing to the old (6) install of the JDK.
Make sure that you haven't selected a lower source level for compilation; eg. -source 1.6.
Make sure you're using a version of Eclipse that supports Java 7 syntax.

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