Code gets compiled on eclipse ide but showing error in compiling online

#1

Code gets compiled in eclipse ide but showing this error in online compiling and submitting
Main.java:27: error: cannot find symbol
if (s1.compareTo(s2) < 0) {
^
symbol: method compareTo(StringBuilder)
location: variable s1 of type StringBuilder
1 error
Here is my code:

#2

Here is the working piece of code

#3

Not able to find out why test cases are not passing

#4

Your code doesn’t print spaces between the numbers please check it.

#5

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#6

not able to find out why test case are not passing here is my code https://ide.codingblocks.com/s/367750

#7

@shubhamkumarsingh
You can close this doubt and ask another doubt for different doubt