I'm learning java and encountering a variable might not have been initialized error when using switch block.
Here is my code;
public static void main (String  args)
int month = 2;
case 1: monthString = "January";
case 2: monthString = "February";
case 3: monthString = "March";
Switch.java:17: error: variable monthString might not have been initialized
3, then there is no statement in the execution path that initializes
monthString before it's referenced. The compiler won't assume that the
month variable retains its
2 value, even if
The JLS, Chapter 16, talks about "definite assignment" and the conditions under which a variable may be "definitely assigned" before it's referenced.
Except for the special treatment of the conditional boolean operators &&, ||, and ? : and of boolean-valued constant expressions, the values of expressions are not taken into account in the flow analysis.
monthString is not definitely assigned prior to being referenced.
Initialize it before the
String monthString = "unrecognized month";
Or initialize it in a
default case in the
default: monthString = "unrecognized month";