java - Difference between writing a==2 and 2==a -


this question has answer here:

i have question in mind. in many places saw

int a=2; if(2==a){   //some operation }

can tell me advantage on comparing 2==a in place of a==2 .

some people force error, rather incorrect behaviour, if accidentally typed = instead of ==. however:

  • it helps in circumstances (when 1 of values compared modifiable , other isn't)
  • any decent compiler give warning if make mistake (add parentheses and/or explicit comparison if want assignment)

so real purpose make code confusing read.

a better habit might declare variables const, unless want them mutable. prevent accidental assignment, while making code easier rather harder reason about.


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