java - Re-Initializing a Variable as a Constant -

java - Re-Initializing a Variable as a Constant -

i new java. want know whether there way re-initialize declared global variable constant later after using variable ... because after doing work declared variable want utilize in switch case statement...

class { int x; int y; public static void main(string args[]) { a = new a(); system.out.println(a.x); a.y = 3; a.x = 5; switch (a.y) { case a.x:// } } }

this illustration need... print statement mentions, need variable x. later want utilize in switch case statement. don't want utilize x after switch case statement... please help me...

i want know whether there way re-initialize declared global variable constant later after using variable...

no, there isn't. (java doesn't have global variables; looking @ code, x , y instance info members. closest thing java has global variables public static [aka "class"] info members in public classes.)

that because after doing work declared variable want utilize in switch case statement...

you can't if case values (a.x, in case) aren't constants. instead, have utilize if/else if/else:

class { int x; int y; public static void main(string args[]) { a = new a(); system.out.println(a.x); a.y = 3; if (a.y == a.x) { // ... } else if (a.y == something_else) { // ... } else { // ... } } }

java variables switch-statement constants