Install BlueJ

About BlueJ

A free Java Development Environment designed for beginners, used by millions worldwide.

What's new in 5.5.0

This is a release with many different small improvements to BlueJ's usability, plus a few bug fixes. Fixed bugs: - Fixed slowdown bug with Java classes over 5000 lines. - Fixed bug with terminal sometimes not showing exceptions if the stderr pane was not previously visible. - Fixed bug with rectangle characters showing up in the documentation view on Windows. - Fixed bug with assert panel not changing the OK button to enabled (and the field to disabled) when selecting null/not-null as the assertion while recording a test - Show quick fixes even if the locale is one that supports localised Java compiler error messages (e.g. German) Improvements: - The Edit->New CSS File has become Edit->New CSS/Text File and will let you create text files - Select several lines in the Java editor, right-click and select "Screenshot line(s)". A screenshot of those lines will be put on the clipboard. The lines must all be visible on screen. - In the Java editor, middle-click the name of any other class to go to its definition/documentation. (Also available on right-click menu.) - When you inspect a String object, new pane for string content and new "Copy to clipboard" button. - New "Re-run" button on left side of main window, re-runs last constructor or static method (or JavaFX app) with same parameters. (Compiles first, if needed.) - The New Class dialog now has a new dropdown: Template or Minimal; the latter lets you create a class/interface/enum/record/etc without anything in the body. - New checkbox in Preferences, in Interface -> General that lets you turn off re-opening last open project...

Read release notes

Version history