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Thread: variable might not have been initialized...help appreciated

  1. #1
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    Default variable might not have been initialized...help appreciated

    hey guys ive been working on the project and i keep gettin an error here is thy code....
    public class Tickets
    {
    public static void main(String[] args)
     
    {
     
     
     DecimalFormat df = new DecimalFormat("#,000.00");
     
     
     
    Scanner s = new Scanner(System.in); // create a Scanner object
     String name;
     String input;	// read in user input as a string
     
     
      System.out.println("Welcome To Royals Stadium! Please select your ticket tier then enter quanity!");
    System.out.println("(A)Tier 1 $50.00 ");
    System.out.println("(B)Tier 2 $40.00 ");
    System.out.println("(C)Tier 3 $30.00 ");
    System.out.println("Please enter ticket tier A, B, or C: "); 
    	char tick1 = (s.nextLine()).charAt(0);
     
    System.out.println("Please enter quanity: "); 
    int hours1 = Integer.parseInt(s.nextLine());
    	int points1;
     
     if(tick1 == 'A' || tick1 == 'a'){
    		points1 = 50;
    	} // end 'A"
    	else if(tick1 =='B' || tick1 == 'b'){
    		points1 = 40;
    	} // end 'B'
    	else if(tick1 =='C' || tick1 == 'c'){
    		points1 = 30;
    	} // end 'C'
     
     System.out.println("Would you like to add Parking to the Ticket ");	// user prompt
      System.out.println("(Y for Yes, N for No) ");	// user prompt
     input = s.nextLine();
     
     double totalcredits = points1*hours1;   (this is where the error occurs)	
    double totalhours = hours1;
    	double gpa = (double) totalcredits/totalhours;
    	System.out.print("Your Grand ticket total is" + df.format(gpa));





    here is the error

    Tickets.java:55: variable points1 might not have been initialized
    double totalcredits = points1*hours1;
    ^
    1 error
    i just cant figure out why its not goin through
    thanks for your help!
    Last edited by helloworld922; February 3rd, 2012 at 05:25 PM.


  2. #2
    Think of me.... Mr.777's Avatar
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    Default Re: variable might not have been initialized...help appreciated

    Can't you just understand the error? It's plain english, saying your variables points1 has not been initialized. Initialize points1 where you have declared it.

  3. #3
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    Default Re: variable might not have been initialized...help appreciated

    Lighten up. Yes i can read the error code. I thought I already declared and initialized points1.
    int points1; //(declared)
     
    if(tick1 == 'A' || tick1 == 'a'){
    		points1 = 50;      //( initialed a value)
    	} // end 'A"
    	else if(tick1 =='B' || tick1 == 'b'){
    		points1 = 40;      // ( initialed a value)
    	} // end 'B'
    	else if(tick1 =='C' || tick1 == 'c'){
    		points1 = 30;     // ( initialed a value)
    	} // end 'C'
    Thanks for your help!
    Last edited by helloworld922; February 3rd, 2012 at 05:24 PM.

  4. #4
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    Default Re: variable might not have been initialized...help appreciated

    It looks like you have declared and initialized it properly but thats not true. You have declared it correctly but all initialization is happening in conditional loop so there might be a situation where programs flow doesn't pass through any of the loop then no initialization will happen and compiler always try to avoid that situation. This error is pointing to that situation.

    Just add this extra line
    else
    {
    points1 = 30;
    }


    Error will be gone. or you initilize it where you have declared it.
    Always remember local member don't get default value as instance variable.

    Hope this help. For instance or local variable look here URL

  5. #5
    Super Moderator pbrockway2's Avatar
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    Default Re: variable might not have been initialized...help appreciated

    Notice that the Java compiler does not (cannot?) do any complicated analysis to see if one or other of the if branches - or corresponding case parts of a switch statement - *must* be reached.

    The logic of your program might imply that one of A, B or C hold, but you still have to help the compiler by covering all cases including that where none of the conditions hold. If no assignment makes sense you have the option of throwing an exception.

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