Java String incorrect concatenation sequence of different languages

Question

So, as you can see from the image, I combined a, c and b. And I get the expected result. But in the second println, when I concatenated a, e and b, I got concatenation at the end, and not where I expected. I want to know the reason for this behavior and the solution to this behavior. Thank you in advance.

import java.util.*; public class prob { public static void main(String... args) { String a="الف",b="1/2",c="ب",e="B"; System.out.println(a+" : "+c+" : "+b); System.out.println(a+" : "+e+" : "+b); } } 

EDIT (to explain why my question is not a duplicate): My question is converting L2R languages ​​to R2L.

Answer 1

This is because the first character is R2L (right-to-left orientation, as in Asian languages), so the following character appears at the beginning (correct orientation):

First char:

 الف // actual orientation ← 

The second char is added to L

 // add ← B : الف // actual orientation → 

After that, B is L2R, as usual in Europe, so the following char (1/2) is added to the right orientation AFTER B:

 // → add in this direction B : 1/2 : الف // actual orientation → (still) 

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You can easily test it by copying the char paste and manually directing it manually, you will see how the orientation changes depending on the entered char.

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UPDATE:

What is my solution for this problem, because I did this example only to show what problem I encountered when creating large reports, where data is sometimes used, it is L2R String, and sometimes R2L. And I want to make a string in exactly this format. (

From this answer :

• Insert from left to right (U + 202A)
• Right to left insert (U + 202B)
• Formatting Pop Destinations (U + 202C)

So, in java, in order to implement an RTL language such as Arabic in LTR, like English, you would do

 myEnglishString + "\u202B" + myArabicString + "\u202C" + moreEnglish 

and do the reverse

 myArabicString + "\u202A" + myEnglishString + "\u202C" + moreArabic 

See (for source material)

• Bidirectional general formatting for more details,
• Unicode specification section under Directional Formatting Codes

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ADD ON 2:

 char l2R = '\u202A'; System.out.println(l2R + a + " : " + e +" : "+b); 

OUTPUT:

 ‪الف : B : 1/2 

Answer 2

The reason, as already mentioned in this, is that some line has an orientation from right to left.

You can manually set the letf-right-right orientation for a line with a right-to-left orientation, with a \u200e control character , for example:

 String a="\u200eالف",b="1/2",c="\u200eب",e="B"; System.out.println(a+" : "+c+" : "+b); System.out.println(a+" : "+e+" : "+b);