[Java] What is an anonymous object.

An anonymous object is an object whose reference is not saved in a named reference variable, it is the one that does not have a reference variable referencing it.
There is a simple object instantiation:

    Sample s = new Sample();

and the anonymous object instantiation:

     new Sample();

The anonymous object is created and dies instantaneously. But, still  with anonymous objects work can be extracted before it dies like calling a method using the anonymous object:

     new Sample().display()

The anonymous object can be used only once in the program.  We can’t use  twice or more as the anonymous object dies immediately after doing its  assigned task.

    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

if an object would be used once only, you can use an anonymous object instantiation instead of object instantiation.

Remarks
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Reference:
Introduction to Java Programming, Y. Daniel Liang
http://www.austincc.edu/baldwin/ITSE2321LectureNotesAndSlides/LectureNotes/Lecture05/Lecture05.htm