Blue triangle indicates default (package visible) method.
Are you using Subversion and the Sublipse plugin for Eclipse? Those black boxes with white asterisks indicate that something in that directory has changed compared to the latest version that is checked in. If its on a file, then that file has changed.
It means there is a problem with the build path in your project. If it is an android project then it mostly means the target value specified in project. properties file cannot be found. This can also be caused because of other kinds of built problems.
In Eclipse IDE, If a project contains errors, a small “red-x” icon will be displayed in the files that are causing the error. This useful feature is supported in Java related perspectives only, for example, “Package Explorer”.
This is a fairly comprehensive list from the Eclipse documentation. If anyone knows of another list — maybe with more details, or just the most common icons — feel free to add it.
Latest: JDT Icons
2019-06: JDT Icons
2019-03: JDT Icons
2018-12: JDT Icons
2018-09: JDT Icons
Photon: JDT Icons
Oxygen: JDT Icons
Neon: JDT Icons
Mars: JDT Icons
Luna: JDT Icons
Kepler: JDT Icons
Juno: JDT Icons
Indigo: JDT Icons
Helios: JDT Icons
There are also some CDT icons at the bottom of this help page.
If you're a Subversion user, the icons you're looking for may actually belong to Subclipse; see this excellent answer for more on those.
I can't find a way to create a table with icons in SO, so I am uploading 2 images.
In eclipse help documentation, we can all icons information as follows. Common path for all eclipse versions except eclipse version:
https://help.eclipse.org/2019-09/index.jsp?nav=%2F1
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