View the source code of the JDK class library in eclipse

Transfer from http://www.cnblogs.com/gzgg/archive/2011/10/28/2227602.html

View the source code of the JDK class library in eclipse

Settings:

1. Point "Window", "Preferences", "Java", "Installed JREs"

2. The right side of "Installed JREs" is the list pane, listing the JRE environment in the system, selecting your JRE, and then clicking "Edit ..." on the edge, a window will appear (edit JRE)

3. Select this entry for the Rt.jar file: "C:\Program Files\java\jre_1.5.0_06\lib\rt.jar"
Point to the left of the "+" sign to expand it,

4. After expanding, you can see "source Attachment: (None)", point this item, point to the right button "Source Attachment ...", select "Src.zip" file under your JDK directory

5. "OK", end.

Dt.jar is a class library about the operating environment, mainly swing packages
Tools.jar is a class library of some tools
Rt.jar contains the base class library of the JDK, which is the class file of all the classes you see in Java doc

use:

You can select the name of a type, method, or field in the Java source editor or Code Snippet Editing Test window, and then open the editor for the definition of the element.

In the Java editor, select the name of the type, method, or field. You can also just click once in the name.
Perform one of the following actions:
1. From the menu bar, select Browse > Open claims
2. From the editor's pop-up menu, select Open declaration
3. Press the F3 key

Or

1. Press the Ctrl key.
2. In the Java editor, move the mouse over the name of the type, method, or field until the name becomes underlined.
3. Click the hyperlink once.

If you have more than one definition with the same name, a dialog box appears, and you can select a definition that you want to open. An editor opens that contains the selected element.

To view the source code of the JDK class library in eclipse