java - Break Label is missing even when the label is inside the enclosing loop -

can tell me why compiler says label missing in below code:

case1:

error: label missing

void crazyloop() {     int c = 0;     jack: while (c < 8) {         jill: system.out.println(c);         if (c > 3)             break jill;         else             c++;     } } 

here jill reachable have declared jill inside jack , not outside jack.

case2:

error: c cannot resolved. , if :

void crazyloop() {     jill:int c = 0;     jack: while (c < 8) {          system.out.println(c);         if (c > 3)             break jill;         else             c++;     } } 

the compiler says c cannot resolved variable.

can please explain happening ?

from jsl 14.15. break statement

a break statement label identifier attempts transfer control enclosing labeled statement (§14.7) has same identifier label

so error caused break statement not referring label of loop. also, statements may have label prefixes. see documentation

the following code compiles successfully:

 void crazyloop() {     int c = 0;     ill:     c= 0;  jack: while (c < 8) {      system.out.println(c);     if (c > 3)         break jack;     else         c++; }