Print Arabic (RTL) and English (LTR) in the correct directions at the same time

Question

I want to output "Arabic" and "English" text at the same time in Java for example, outputting the following statement: مرحبا I am Adham.

I searched the internet and I found that the BiDi algorithm is needed in this case. Are there any java classes for BiDi.

I have tried this class BiDiReferenceJava and I tested it, but when I call runSample() in the class BidiReferenceTest and entering an arabic string as parameter, I got an OutOfIndexException as the count of the character is duplicated (exactly at this line of code in the class BidiReferenceTestCharmap)

byte[] result = new byte[count];

Where if the string length is 4 the count is 8!

Answer 1

The ICU4J is more or less the standard comprehensive Unicode library for Java, and thus supports the bidirectional algorithm. I really wonder why you need this, though; BiDi is usually applied by the display layer, unless you're a word-processor or something.

BidiReference.java is apparently a demonstration piece; it's designed to show how the algorithm works on ASCII characters instead of using actual Unicode characters.