blocks|key|4367146|text|通常，如果您已经安装了JDK6u14，eclipse应该会检测到它，并将其自动声明到“已安装的JRE”列表中。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4367147|如果没有，您可以通过“Windows/Preferences”添加JDK：Java+>+Installed+JREs|offset|length|style|CODE|4367148|只需指向您的JDK安装的根目录:它应该包含JDK的源代码(src.zip)，并通过eclipse自动检测并附加到rt.jar。|4367149|​|4367150|📷|atomic|4367151|4367152|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/caaee9004e9f4214c12e4f6881bbe4ca.png|imageAlt^0|0|11|L|0|T|7|1K|6|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Z|8|@$D|10|E|11|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|12|8|@$D|13|E|14|F|G]|$D|15|E|16|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|17|8|@]|9|@]|A|$]]|$1|L|3|M|5|N|7|18|8|@]|9|@$D|19|E|1A|1|1B]]|A|$]]|$1|O|3|K|5|6|7|1C|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|1D|8|@]|9|@]|A|$]]]|Q|$R|$5|S|T|U|A|$V|W|X|-4]]]]

Normally, if you have installed the JDK6u14, eclipse should detect it and declare it automatically in its "installed JRE" list.

If not, you can add that JDK through "Windows/Preferences": <code>Java &gt; Installed JREs</code>:

Just point to the root directory of your JDK installation: it should include the sources of the JDK (<code>src.zip</code>), automatically detected and attached to <code>rt.jar</code> by eclipse.

<img src="https://i.stack.imgur.com/pVOlY.png" alt="Add JRE VM, from pic.dhe.ibm.com/infocenter/iadthelp/v8r0/topic/org.eclipse.jdt.doc.user/tasks/images/task-add_jre_std_vm.PNG">

blocks|key|138330|text|您不一定需要添加并删除源代码，但您可能需要删除没有附加源代码的的JRE。|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|138331|在查看“已安装的JRE”时，我看到我的JDK已正确设置了source，但机器上的默认JRE没有源代码。在寻找源代码时，Eclipse默认使用该选项。|138332|我刚刚使用remove按钮驱逐了JRE，留下了我的JDK。然后我点击了F3，源代码就在那里。嗯!|138333|entityMap^0|W|4|0|0|22|0|0|1C|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|K|$]]

You don't necessarily need to add the source, but you rather may need to remove a JRE that does not have the source attached.

On looking at the "installed JRE's" I saw that my JDK was setup properly with source, but the default JRE on the machine had no sources. Eclipse was defaulting to that when looking for source.

I just used the remove button to expel the JRE, leaving my JDK. I then hit F3 and the source was there. Yeah!

blocks|key|1438116|text|按住Ctrl键，然后单击你想要查看其内部工作的类(例如：String)，然后你会找到“附加源”按钮。单击它。然后点击External+Folder。然后浏览到您的jdk位置，每个实例的C:\Program+Files\Java\jdk1.6.0。就这样。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1438117|​|1438118|📷|atomic|1438119|1438120|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/ae64321c2638370f637b22685346f5bb.png|imageAlt^0|S|6|2K|U|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@$9|11|A|12|1|13]]|E|$]]|$1|K|3|G|5|6|7|14|8|@]|D|@]|E|$]]|$1|L|3|-4|5|6|7|15|8|@]|D|@]|E|$]]]|M|$N|$5|O|P|Q|E|$R|S|T|-4]]]]

Hold ctrl key and then click on class of which you want to see the inner working (for ex: <code>String</code>) then you will find there button &quot;Attach Source&quot;. Click on it. Then click on External Folder. Then browse to your jdk location, per instance <code>C:\Program Files\Java\jdk1.6.0</code>. That's it.
<a href="https://i.stack.imgur.com/IYS8f.png" rel="noreferrer"><img src="https://i.stack.imgur.com/IYS8f.png" alt="enter image description here" /></a>

blocks|key|1150852|text|要附加JDK源代码，以便参考Java源代码进行代码查找，这有助于学习库实现，有时还有助于调试，您所要做的就是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1150853|在JRE+Project+>+Reference+Library中，找到rt.jar。右键单击并转到属性：|offset|length|style|BOLD|1150854|选择右侧和左侧的“Java源附件”并选择“外部位置”，然后单击“外部文件”按钮，并在我的windows计算机的路径中找到$JAVA_HOME路径中的"src.zip"文件。在我的案例中，E114src.zip<代码>E215位置是:E116C:/Program+Files/Java/jdk1.7.0_45/src.zip.|1150855|您现在已经完成了！只需在项目代码中的任何库类上单击JavaCtrl键并单击，即可查找Java类的源代码。|1150856|entityMap^0|0|E|I|10|6|0|8|9|K|6|V|6|22|9|0|K|H|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]|$D|R|E|S|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|T|8|@$D|U|E|V|F|G]|$D|W|E|X|F|G]|$D|Y|E|Z|F|G]|$D|10|E|11|F|G]]|9|@]|A|$]]|$1|J|3|K|5|6|7|12|8|@$D|13|E|14|F|G]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|15|8|@]|9|@]|A|$]]]|M|$]]

To attach JDK source so that you refer to Java Source Code for code look-up which helps in learning the library implementation and sometimes in debugging, all you have to do is:

In your Eclipse Java Project > JRE Reference Library locate rt.jar. Right click and go to Properties:

Select "Java Source Attachment" on the right and to the left select "External Location" and click on "External File" Button and locate "src.zip" file in your $JAVA_HOME path in my case for my windows machine src.zip location is: C:/Program Files/Java/jdk1.7.0_45/src.zip.

You are done now! Just Ctrl + click on any Java library Class in your project code to look-up the source code for the java class.

blocks|key|1439892|text|要做到这一点，最简单的方法是安装JDK并告诉Eclipse将其用作默认的JRE。使用默认安装。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1439893|(从内存中)|1439894|打开窗口->优先级。选择已安装的Java运行时，然后选择Add。导航到JDK的根目录(\Programs...\Java)并单击Ok。然后选择它作为默认的JRE+(复选标记)。|1439895|在工作空间重建之后，您应该将源代码附加到所有JRE类。|1439896|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|J|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|K|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|L|8|@]|9|@]|A|$]]|$1|F|3|G|5|6|7|M|8|@]|9|@]|A|$]]|$1|H|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|I|$]]

The easiest way to do this, is to install a JDK and tell Eclipse to use it as the default JRE. Use the default install.

(from memory) 

Open Window -> Prefences. Select Installed Java runtimes, and choose Add. Navigate to root of your JDK (\Programs...\Java) and click Ok. Then select it to be the default JRE (checkmark).

After a workspace rebuild, you should have source attached to all JRE classes.

blocks|key|138549|text|一个简单的方法对我来说很有效：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|138550|138551|检查您是否安装了jdk+(通常位于"Program+Files\Java“中，如果没有，请安装它。|ordered-list-item|138552|将其链接到eclipse。在Preferences+-->+Java+-->+Installed+JREs中，删除已安装的JRE并添加JDK.|offset|length|style|BOLD|138553|138554|然后，项目将检测到它，并从JDK添加新的库。在这个过程的最后，它看起来像我附加的屏幕截图。|138555|​|138556|📷|atomic|138557|138558|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/2388bcfdf45078ec00bce2b003424937.png|imageAlt^0|0|0|0|E|13|0|0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|13|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|14|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|15|8|@]|9|@]|A|$]]|$1|F|3|G|5|E|7|16|8|@$H|17|I|18|J|K]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|19|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|1A|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1B|8|@]|9|@]|A|$]]|$1|Q|3|R|5|S|7|1C|8|@]|9|@$H|1D|I|1E|1|1F]]|A|$]]|$1|T|3|P|5|6|7|1G|8|@]|9|@]|A|$]]|$1|U|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11|12|-4]]]]

Easy way that just worked for me: 

<ol>
<li>Check if you have a jdk installed (it is usually in "Program
Files\Java", if you don't have one, install it. </li>
<li>Link it to eclipse. In Preferences --> Java --> Installed JREs remove the JRE installed and add the JDK.</li>
</ol>

Then the project will detect it and add the new libraries from the JDK. At the end of this process it looks like the screenshot I attach.

<a href="https://i.stack.imgur.com/e4TEZ.png" rel="noreferrer"><img src="https://i.stack.imgur.com/e4TEZ.png" alt="JDK added"></a>

blocks|key|138372|text|只需删除JDK中的JRE并添加Preferences>Java>Installed的文件夹即可。如果您只是添加JDK而仍然离开JRE，它将不会工作|type|unstyled|depth|inlineStyleRanges|entityRanges|data|138373|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

Just remove the JRE in Preferences>Java>Installed JRE and add the folder of your JDK. If you just add JDK but still leave JRE it won't work

blocks|key|4367475|text|对我(使用JDK7)起作用的是：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4367476|4367477|从GrepCode下载openjdk-xy-Sourcees.jar，|ordered-list-item|offset|length|4367478|将文件重命名为src.zip，|4367479|将src.zip复制到添加到eclipse的JRE/JDK的根文件夹(其中包含bin和lib文件夹)|4367480|重启eclipse<代码>H29<代码>G210|4367481|4367482|或者，如果不想写入JDK文件夹，也可以(至少)在Java的Window+%7C+Preferences菜单中将src.zip附加到eclipse中的rt.jar。|4367483|如果你不喜欢从GrepCode下载源代码，你也可以直接从openJDK下载。不过，这需要更多的努力。将上面的步骤一替换为以下步骤：|4367484|4367485|从here下载JDK源代码，|4367486|从压缩文件的*openjdk\jdk\src\share\classes*文件夹中提取所有文件夹，|4367487|创建文件src.zip并将这些文件夹添加到其中，|4367488|将src.zip复制到添加到eclipse的JRE/JDK的根文件夹(其中包含bin和lib文件夹)H220H121重新启动eclipse<代码>H222<代码>G223|4367489|4367490|获得src.zip的第三种选择是从here下载非官方的OpenJDK版本。src.zip包含在下载的压缩包中。|4367491|entityMap|0|LINK|mutability|MUTABLE|url|http://grepcode.com/project/repository.grepcode.com/java/root/jdk/openjdk/|1|http://download.java.net/openjdk/jdk7/|2|https://github.com/alexkasko/openjdk-unofficial-builds^0|0|0|1|8|0|0|0|0|0|0|0|0|0|1|4|1|0|0|0|0|0|H|4|2|0^^$0|@$1|2|3|4|5|6|7|1G|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|1H|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|1I|8|@]|9|@$F|1J|G|1K|1|1L]]|A|$]]|$1|H|3|I|5|E|7|1M|8|@]|9|@]|A|$]]|$1|J|3|K|5|E|7|1N|8|@]|9|@]|A|$]]|$1|L|3|M|5|E|7|1O|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|1P|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|1Q|8|@]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1R|8|@]|9|@]|A|$]]|$1|S|3|-4|5|6|7|1S|8|@]|9|@]|A|$]]|$1|T|3|U|5|E|7|1T|8|@]|9|@$F|1U|G|1V|1|1W]]|A|$]]|$1|V|3|W|5|E|7|1X|8|@]|9|@]|A|$]]|$1|X|3|Y|5|E|7|1Y|8|@]|9|@]|A|$]]|$1|Z|3|10|5|E|7|1Z|8|@]|9|@]|A|$]]|$1|11|3|-4|5|6|7|20|8|@]|9|@]|A|$]]|$1|12|3|13|5|6|7|21|8|@]|9|@$F|22|G|23|1|24]]|A|$]]|$1|14|3|-4|5|6|7|25|8|@]|9|@]|A|$]]]|15|$16|$5|17|18|19|A|$1A|1B]]|1C|$5|17|18|19|A|$1A|1D]]|1E|$5|17|18|19|A|$1A|1F]]]]

What worked for me (with JDK7) was the following:

<ol>
<li>Download the openjdk-xy-sources.jar from <a href="http://grepcode.com/project/repository.grepcode.com/java/root/jdk/openjdk/" rel="nofollow">GrepCode</a>,</li>
<li>rename the file to src.zip,</li>
<li>copy src.zip to the root folder of the JRE/JDK added to eclipse (the one with bin and lib folders in it)</li>
<li>restart eclipse</li>
</ol>

Alternatively, if you don't want to write to your JDK folder, you could also attach src.zip to (at least) rt.jar in eclipse in the Window | Preferences menu in Java | Installed JREs.

If you're not comfortable with downloading the sources from GrepCode, you could also get them from openJDK directly. This requires requires a bit more effort, though.
Replace step one above by the following steps:

<ol>
<li>Download the JDK sources from <a href="http://download.java.net/openjdk/jdk7/" rel="nofollow">here</a>,</li>
<li>extract all folders from the zip file's *openjdk\jdk\src\share\classes* folder,</li>
<li>create a file src.zip and add these folders to it,</li>
<li>copy src.zip to the root folder of the JRE/JDK added to eclipse (the one with bin and lib folders in it)</li>
<li>restart eclipse</li>
</ol>

A third alternative to acquire src.zip is to download the unofficial OpenJDK builds from <a href="https://github.com/alexkasko/openjdk-unofficial-builds" rel="nofollow">here</a>. The src.zip is contained within the downloaded zip.

blocks|key|1438296|text|老问题，这是我最终使用Java源Attatcher插件的结果：http://marketplace.eclipse.org/content/java-source-attacher#.U85j4rF-N7s|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1438297|它可以为不同的开源项目提供源码。奇怪的是，如果你在libs文件夹下有库，你不能从那里附加，但你需要附加源代码，点击显示在"Libraries+from+external“下面的jar。|1438298|entityMap|0|LINK|mutability|MUTABLE|url|http://marketplace.eclipse.org/content/java-source-attacher#.U85j4rF-N7s^0|V|20|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

Old question, be here's what I ended up using Java Source Attatcher plugin: 
<a href="http://marketplace.eclipse.org/content/java-source-attacher#.U85j4rF-N7s" rel="nofollow">http://marketplace.eclipse.org/content/java-source-attacher#.U85j4rF-N7s</a>

It can provide source for different opensource projects. One weird thing thou, if you have libraries under libs folder, you cannot attach from there, but you need to attach source clicking on jar displayed under "Libraries from external".

blocks|key|138049|text|使用ScreenShots的2019年Eclipse的答案|type|unstyled|depth|inlineStyleRanges|offset|length|style|BOLD|entityRanges|data|138050|138051|Step+1：Window+->+Preferences+->+Java+->+Installed+JRE|unordered-list-item|138052|138053|​|138054|📷|atomic|138055|138056|138057|Step+2：选择当前使用的JRE，现在编辑选项将被启用，单击编辑选项|138058|138059|138060|138061|138062|138063|Step+3：从JRE系统库中选择rt.jar，点击相应的下拉展开|CODE|138064|138065|138066|138067|138068|138069|Step+4：选择Source+attachment+none，单击Source+Attachment按钮，将出现源附件配置窗口，选择|138070|138071|138072|138073|138074|138075|Step+5：从jdk文件夹中选择src.zip文件，说ok+ok+finish|138076|138077|138078|138079|138080|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/809bbd73b28eedf7d21df97abceb52ca.png|imageAlt|1|https://ask.qcloudimg.com/http-save/yehe-900000/a2afe60be331f9bcb3e9236e537eaf81.png|2|https://ask.qcloudimg.com/http-save/yehe-900000/b370368f6f1f8f14bdcafcc8fac9f3a5.png|3|https://ask.qcloudimg.com/http-save/yehe-900000/0e01e4964020640bd9817ada6b504204.png|4|https://ask.qcloudimg.com/http-save/yehe-900000/868358f0a5f15bba8f1e470ece01f6a9.png^0|R|2|0|0|0|1H|0|0|0|1|0|0|1|0|1|0|0|0|1|0|0|0|Z|0|0|0|1|0|0|1|0|1|1|0|0|1|0|0|0|X|H|6|0|0|0|1|0|0|1|0|1|2|0|0|1|0|0|0|1V|9|M|Y|H|0|0|0|0|1|3|0|0|0|0|6|H|7|0|0|0|0|1|4|0|0^^$0|@$1|2|3|4|5|6|7|20|8|@$9|21|A|22|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|23|8|@]|D|@]|E|$]]|$1|G|3|H|5|I|7|24|8|@$9|25|A|26|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|27|8|@]|D|@]|E|$]]|$1|K|3|L|5|6|7|28|8|@$9|29|A|2A|B|C]]|D|@]|E|$]]|$1|M|3|N|5|O|7|2B|8|@$9|2C|A|2D|B|C]]|D|@$9|2E|A|2F|1|2G]]|E|$]]|$1|P|3|L|5|6|7|2H|8|@$9|2I|A|2J|B|C]]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|2K|8|@]|D|@]|E|$]]|$1|R|3|S|5|I|7|2L|8|@$9|2M|A|2N|B|C]]|D|@]|E|$]]|$1|T|3|-4|5|6|7|2O|8|@]|D|@]|E|$]]|$1|U|3|L|5|6|7|2P|8|@$9|2Q|A|2R|B|C]]|D|@]|E|$]]|$1|V|3|N|5|O|7|2S|8|@$9|2T|A|2U|B|C]]|D|@$9|2V|A|2W|1|2X]]|E|$]]|$1|W|3|L|5|6|7|2Y|8|@$9|2Z|A|30|B|C]]|D|@]|E|$]]|$1|X|3|-4|5|6|7|31|8|@]|D|@]|E|$]]|$1|Y|3|Z|5|I|7|32|8|@$9|33|A|34|B|C]|$9|35|A|36|B|10]]|D|@]|E|$]]|$1|11|3|-4|5|6|7|37|8|@]|D|@]|E|$]]|$1|12|3|L|5|6|7|38|8|@$9|39|A|3A|B|C]]|D|@]|E|$]]|$1|13|3|N|5|O|7|3B|8|@$9|3C|A|3D|B|C]]|D|@$9|3E|A|3F|1|3G]]|E|$]]|$1|14|3|L|5|6|7|3H|8|@$9|3I|A|3J|B|C]]|D|@]|E|$]]|$1|15|3|-4|5|6|7|3K|8|@]|D|@]|E|$]]|$1|16|3|17|5|I|7|3L|8|@$9|3M|A|3N|B|C]|$9|3O|A|3P|B|10]|$9|3Q|A|3R|B|10]]|D|@]|E|$]]|$1|18|3|-4|5|6|7|3S|8|@]|D|@]|E|$]]|$1|19|3|L|5|6|7|3T|8|@]|D|@]|E|$]]|$1|1A|3|N|5|O|7|3U|8|@]|D|@$9|3V|A|3W|1|3X]]|E|$]]|$1|1B|3|L|5|6|7|3Y|8|@]|D|@]|E|$]]|$1|1C|3|-4|5|6|7|3Z|8|@]|D|@]|E|$]]|$1|1D|3|1E|5|I|7|40|8|@$9|41|A|42|B|C]|$9|43|A|44|B|10]]|D|@]|E|$]]|$1|1F|3|-4|5|6|7|45|8|@]|D|@]|E|$]]|$1|1G|3|L|5|6|7|46|8|@]|D|@]|E|$]]|$1|1H|3|N|5|O|7|47|8|@]|D|@$9|48|A|49|1|4A]]|E|$]]|$1|1I|3|L|5|6|7|4B|8|@]|D|@]|E|$]]|$1|1J|3|-4|5|6|7|4C|8|@]|D|@]|E|$]]]|1K|$1L|$5|1M|1N|1O|E|$1P|1Q|1R|-4]]|1S|$5|1M|1N|1O|E|$1P|1T|1R|-4]]|1U|$5|1M|1N|1O|E|$1P|1V|1R|-4]]|1W|$5|1M|1N|1O|E|$1P|1X|1R|-4]]|1Y|$5|1M|1N|1O|E|$1P|1Z|1R|-4]]]]

Answer For Eclipse 2019 With ScreenShots

<ul>
<li>Step 1: Window -> Preferences -> Java -> Installed JREs</li>
</ul>

<a href="https://i.stack.imgur.com/8S4wH.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/8S4wH.png" alt="Installed JREs"></a>

<ul>
<li>Step 2: Select Currently used JRE, now Edit option will get enabled, Click on edit option</li>
</ul>

<a href="https://i.stack.imgur.com/nKL21.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/nKL21.png" alt="Currently used JRE option edit"></a>

<ul>
<li>Step 3: Select <code>rt.jar</code> from JRE systems library, click on corresponding drop down to expand</li>
</ul>

<a href="https://i.stack.imgur.com/SGiK7.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SGiK7.png" alt="rt.jar"></a>

<ul>
<li>Step 4: Select <code>Source attachment none</code>, Click on <code>Source Attachment</code> Button, Source attachment configuration window will appear, Select <code>external location</code></li>
</ul>

<a href="https://i.stack.imgur.com/dhLSW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/dhLSW.png" alt="Source attachment external location"></a>

<ul>
<li>Step 5: Select <code>src.zip</code> file from jdk folder, say ok ok finish</li>
</ul>

<a href="https://i.stack.imgur.com/YnNOd.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/YnNOd.png" alt="src.zip"></a>

blocks|key|137735|text|“praveenak”提供的选项也可以应用于任何其他提供了源文件的jar文件。例如，对于JavaFx，我们右键单击jfxrt.jar，选择“属性”，然后在外部位置下输入jdk1.8.0_05/javafx-src.zip作为“路径”。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|137736|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

The option provided by"praveenak" can also be applied to any other jar files with source file provided. For example, for JavaFx, we right click jfxrt.jar, select "Properties" and enter jdk1.8.0_05/javafx-src.zip for "Path" under External location.

blocks|key|4367819|text|您需要附加JDK附带的java源代码(C：\Program+Files\Java\jdk1.8.0_71\src.zip)。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4367820|步骤(**来源：link)：|offset|length|4367821|4367822|选择任何Java项目|ordered-list-item|4367823|展开引用的任何JAR文件，在本例中为rt.jar，即Java+runtime|4367824|，右键单击并通过浏览源代码路径转到|4367825|。|4367826|4367827|4367828|entityMap|0|LINK|mutability|MUTABLE|url|http://javarevisited.blogspot.in/2012/12/how-to-attach-source-in-eclipse-Jar-JDK-debugging.html^0|0|8|4|0|0|0|0|0|1|1|0|0^^$0|@$1|2|3|4|5|6|7|Z|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|10|8|@]|9|@$D|11|E|12|1|13]]|A|$]]|$1|F|3|-4|5|6|7|14|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|15|8|@]|9|@]|A|$]]|$1|J|3|K|5|I|7|16|8|@]|9|@]|A|$]]|$1|L|3|M|5|I|7|17|8|@]|9|@]|A|$]]|$1|N|3|O|5|I|7|18|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|19|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1A|8|@]|9|@]|A|$]]|$1|R|3|-4|5|6|7|1B|8|@]|9|@]|A|$]]]|S|$T|$5|U|V|W|A|$X|Y]]]]

You need to attach java sources which comes with JDK(C:\Program Files\Java\jdk1.8.0_71\src.zip). 

Steps(**Source: <a href="http://javarevisited.blogspot.in/2012/12/how-to-attach-source-in-eclipse-Jar-JDK-debugging.html" rel="nofollow">link</a>):

<ol>
<li>Select any Java project</li>
<li>Expand Referenced libraries</li>
<li>Select any JAR file, in our case rt.jar which is Java runtime</li>
<li>Right click and go to properties</li>
<li>Attach source code by browsing source path.</li>
</ol>

blocks|key|1151700|text|此处解决的问题：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1151701|"Windows/Preferences"：Java+>+Installed+JRE：|1151702|然后设置/更新JRE+HOME：C:\Program+Files\Java\jdk1.8.0_221\jre|offset|length|style|BOLD|1151703|你应该试试这个。|1151704|entityMap^0|0|0|G|12|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|P|8|@$F|Q|G|R|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|S|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|T|8|@]|9|@]|A|$]]]|M|$]]

issue resolved here :

"Windows/Preferences": Java > Installed JREs:

then set/update JRE HOME : C:\Program Files\Java\jdk1.8.0_221\jre

should try this.

blocks|key|1438642|text|enter+image+description+here|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1438643|如果要添加jre和jkd路径，请删除jre安装路径，并保留jdk路径。|1438644|entityMap|0|LINK|mutability|MUTABLE|url|https://i.stack.imgur.com/7vTYs.png^0|0|S|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

<a href="https://i.stack.imgur.com/7vTYs.png" rel="nofollow noreferrer">enter image description here</a>

if you are add jre and jkd path, remove jre install path, keep jdk path is work

I cannot for the life of me attach the java source code to eclipse so I can see the inner workings of the language. Not even something as simple as the String Class.

when I run java -version this is what I have:

<pre><code>java version "1.6.0_14"
Java(TM) SE Runtime Environment (build 1.6.0_14-b08)
Java HotSpot(TM) Client VM (build 14.0-b16, mixed mode, sharing)
</code></pre>

I am downloading the java souce from:
<a href="http://download.java.net/jdk6/source/" rel="noreferrer">http://download.java.net/jdk6/source/</a>

And in eclipse when I attach it It says:

<pre><code>The JAR file "C:\Program Files\Java\jre6\jdk-6u14-fcs-src-b08-jrl-21_may_2009.jar" 
has no source attachment.
</code></pre>

What am I doing wrong?

Attach the Java Source Code

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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功能1上新10个字符

功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符功能2描述100个字符。

功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符功能2上新100个字符。

功能5描述100个字符功能5描述100个字符功能5描述100个字符功能5描述100个字符功能5描述100个字符功能5描述100个字符

功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符功能5上新100个字符

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我无论如何也不能将java源代码附加到eclipse上，这样我就可以看到该语言的内部工作原理。甚至不是像String类这样简单的东西。当我运行java -version时，我得到的是：java version "1.6.0_14"Java(TM) SE Runtime Environment (build 1.6.0_14-b08)Java HotSpot(TM) Client VM (build

问附加Java源代码
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