Why is 010 not equal to 10?

Question

A Java challenge question asked, "what is the output of the following code?
System.out.println(010==10);"
The correct answer was false, so my question is why does the leading zero make these values unequal?

Answer 1

010 is an octal value (8), while 10 is decimal.

Answer 2

so number starting with 0 is octal in java???...

Answer 3

maybe that is string

Answer 4

because java accepts it as an octal value, So 010 = 8. while 10 is you know.