Where can I see the source code of the Sun JDK?

Question

I want to have a look at how Java implements LinkedList. Where should I go to look at the source code?

It is the source code of the jdk, not the jvm. – peterh Jan 23 '15 at 20:30 — peterh, Jan 23 '15 at 20:30

score 68 · Answer 1 · edited Jun 29 '17 at 03:24

68

Install the Java SE Development Kit from http://java.sun.com/javase/downloads/index.jsp.

Once installed, you should find an archive called src.zip in the top of the JDK installation directory. The Java source code is in there.

The file is java/util/LinkedList.java.

update: You may also like to visit the online OpenJDK Source repository. See this answer below.

edited Jun 29 '17 at 03:24

anishpatel

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answered Nov 04 '08 at 06:01

Bill Karwin

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Bill, this doesn't appear to be the case with the latest Java update (7u51). I wonder what the deal is... – ryvantage Jan 16 '14 at 00:48
1

They seem to have moved the JDK source to http://hg.openjdk.java.net/jdk7/jdk7/jdk/ – Bill Karwin Jan 16 '14 at 01:54
Actually, I figured it out. I downloaded the wrong JDK package. =/ – ryvantage Jan 16 '14 at 03:13

score 20 · Answer 2 · answered Nov 04 '08 at 06:32

20

You have the source in the docjar:

LinkedList.java (from the openjdk-7)

answered Nov 04 '08 at 06:32

VonC

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+1, First link that is still working and can be viewed online – BeniBela Dec 29 '13 at 00:39
Seems outdated to me. Last update was 2010, so no Java 8 :( – Qw3ry Aug 05 '19 at 09:15
@Qw3ry That is possible indeed. This was one of my first answers on this site eleven years ago. – VonC Aug 05 '19 at 09:40

score 11 · Answer 3 · edited Jun 29 '17 at 09:42

11

The sources are hosted at hg.openjdk.java.net. You can find the library sources for a specific JDK version under src/share/classes. For example, the JDK 8 source for java.util.LinkedList is located at:

hg.openjdk.java.net/jdk8u/jdk8u/jdk/file/tip/src/share/classes/java/util/LinkedList.java

You can follow the instructions here to explore the source.

edited Jun 29 '17 at 09:42

anishpatel

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answered Mar 15 '11 at 06:06

fouding.zheng

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score 4 · Answer 4 · answered Jun 29 '16 at 08:53

grepcode.com has source code of almost all opensource projects. It also provides common IDE features like find usages, derived types, etc.

Here you can find LinkedList source: http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/8u40-b25/java/util/LinkedList.java/

score 3 · Answer 5 · edited Feb 08 '13 at 07:08

3

As previously said, you have a src.zip file installed with Sun JDK if you have selected it during installation. Moreover, if you use eclipse and add a JDK to your JRE list, it will attach automatically the sources to the jar and if you try to open a class with Ctrl+Shift+T (Open Type), you type LinkedList, and it will show you the code of the class.

edited Feb 08 '13 at 07:08

Naveed S

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answered Nov 04 '08 at 08:44

Denis R.

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score 3 · Answer 6 · edited Jan 21 '14 at 15:44

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If you have a JDK, you can find the source in the src.zip file.

If you have an IDE, you can just ctrl+click or similar on the class/method you want to see the definition of.

edited Jan 21 '14 at 15:44

naXa stands with Ukraine

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answered Jun 01 '09 at 21:09

Peter Lawrey

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Intellij Idea has not found the src file automatically. Thanks for file reference. – Flowy May 23 '16 at 07:05

score 2 · Answer 7 · answered Nov 04 '08 at 06:00

2

Here:

http://hg.openjdk.java.net/

answered Nov 04 '08 at 06:00

Gustavo Rubio

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Arry · Answer 8 · 2018-07-28T17:03:21.673

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zGrepCode has an online directory of Java open source code. Here is the Sun Java classes available: https://zgrepcode.com/java/openjdk/10.0.2/java.base/sun/

And here is the LinkedList implementation code. Hope it helps.

edited Jul 28 '18 at 17:03

answered Jul 28 '18 at 06:51

Arry

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score 1 · Answer 9 · answered Nov 04 '08 at 06:01

1

I would say start at the OpenJDK repository, but I don't see anything there for the LinkedList objects.

answered Nov 04 '08 at 06:01

Justin Yost

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HA S · Answer 10 · 2018-07-25T01:24:51.750

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The best way to view java source code is to install Intelli-J community edition. Create a new Java project and inside your project create a new class. Inside class if you want to see the source code of LinkedList, create a new LinkedList object as follows:

public class LinkedListWatch{
   public static void main(String[] args){
    LinkedList linkedList = new LinkedList();

  }
}

Now ctrl + mouse left click on LinkedList class, will take you to LinkedList source code. You can explore many things and it could be very useful.

You can look at the implementation of Stack class also; very helpful.

Enjoy searching java open source code.

edited Jul 25 '18 at 01:24

answered Jul 23 '18 at 06:00

HA S

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This isn't useful if there is no attached source documents. Why would you even post this after reading the other answers that explain where to get the source documents? – superPhreshHackerKid Jul 25 '18 at 00:33
I am sure you missed something, I found it very convenient to look for Java source code inside Intellij, check my updated post for screenshots – HA S Jul 25 '18 at 01:18
This is fine for IntelliJ, but what about when you're using an IBM implementation of Java and they didn't include the Java source documents? Someone should download IntelliJ to view them? I disagree, they should do as Bill answered in '08; navigate to the src.zip to view / attach the source code. – superPhreshHackerKid Jul 25 '18 at 19:23
@superPhreshHackerKid You can do this in Eclipse and pretty much any IDE. Plus, you get to browse through the source code as you would with your project. That's far better than dealing with the src.zip yourself. – BaSsGaz Dec 24 '20 at 19:39

Where can I see the source code of the Sun JDK?

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