myway:

1.选择一函数，按住ctrl，显示open declaration（或按F3）;

2.点进去：

如果未配置，点 source attachment configuration -- external file selection --找到你的jdk下的src.zip文件，选择，然后就结束了

3.设置成功无需重启：

百度

1.windows--preferences--java--installed jres --选中jre6--点击右边的edit--选中jre6/lib/rt.jar --点击右边的 source attachment configuration -- external file selection --找到你的jdk下的src.zip文件，选择，然后就结束了

*

2.Short answer would be yes.

You can attach source using the properties for a project.

Go to Properties (for the Project) -> Java Build Path -> Libraries

Select the Library you want to attach source/javadoc for and then expand it, you'll see a list like so:

Source Attachment: (none)

Javadoc location: (none)

Native library location: (none)

Access rules: (No restrictions)

Select Javadoc location and then click Edit on the right hahnd side. It should be quite straight forward from there.

Good luck :)