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Thread: Error:Cannot find Symbol

  1. #1
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    Default Error:Cannot find Symbol

    I'm having some trouble. Right now it's just that the compilier is telling me it cannot find the symbol



    Grades.java:10: error: cannot find symbol
    ArrayList<Integer> Grades = new ArrayList<Integer>();
    ^
    symbol: class ArrayList
    location: class Grades
    [/I]
    public class Grades
    {
     
    public static void main(String []args)
    {
     
    int sum = 0;
    int Grades;
     
    ArrayList<Integer> Grades = new ArrayList<Integer>();
    Grades.add(100);
    Grades.add(90);
    Grades.add(80);
    Grades.add(70);
     
    for(integer element : values){
     
    sum = sum + element;
     
    }
     
    for (int i = 0; i <Gradebook.size(); i++)
    {
     if (i > 0)
     {
      System.out.printl(Gradebook.get(i));
      }


    --- Update ---

    I have never gotten this error before and I copied the ArrayList<> Grades = new ArrayList<>(); from the book so I am clueless as to why I am getting an error


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Error:Cannot find Symbol

    The ArrayList class is in a package. You need an import statement that tells the compiler the name of that package.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
    Super Moderator curmudgeon's Avatar
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    Default Re: Error:Cannot find Symbol

    Don't forget to import java.util.ArrayList.

  4. #4
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    Default Re: Error:Cannot find Symbol

    Nvm fixed that one too

    --- Update ---

    Alright my code compiled without a problem. Thank you guys

    --- Update ---

    //This class will take four grades then display them, remove the first element and display the new Array and Display the Array size and the second object.
     
     
    import java.util.ArrayList; //Imports Arraylist
     
    public class Gradebook     // Main class
    {
     
    public static void main(String []args) //Main method
    {
     
    ArrayList<Integer> Grades = new ArrayList<Integer>(); //creates a new Array;ist
    Grades.add(100);   //Adds 100 to element 0
    Grades.add(90);    // Adds 90 to element 1
    Grades.add(80);    // Adds 80  to element 2
    Grades.add(70);   //Adds 70 to element 3
     
    for(Integer element : Grades){     //The enchanced for loop statement
     
    }
     
    for (int i = 0; i <Grades.size(); i++) //Sets up a break between each number
    {
     if (i > 0)
     {
     System.out.print("|");   //The break to make it easier to read
     
     }
     
      System.out.println(Grades.get(i)); //Displays all the grades
      }
     
    Grades.remove(0); //Removes the first grade
     
    System.out.println(Grades); //Displays the new Grade
     
     
     
    int n = Grades.size();   //Puts the ArrayLists number of elements into int n
    System.out.printf("%d",n);//Displays int n, which is the number of elements
     
    System.out.println(Grades.get(1)); //Displays the second object
     
    }
     
    }


    --- Update ---

    Yeah new problem came up. When I want to access the second object in the Arraylist, which would be element 1, I am getting 380...Do you know why i am getting that?

    --- Update ---

    Am I getting the reference number maybe?

    --- Update ---

    Nvm. I was being stupid forgot that 3 and 80 weren't being split up.

  5. #5
    Super Moderator curmudgeon's Avatar
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    Default Re: Error:Cannot find Symbol

    You will want to improve your code formatting using consistent indentation. Your for loops especially are very difficult to read and it's hard to know what code is inside and what is outside of the for loop. Please edit your code above as this will help both you and us.

    It sort of appears that you're removing an element from the ArrayList from within the for loop, and if so, don't do that as you'll get unexpected side effects. For one if you remove the 0th element while its looping, the next element you get an the next iteration of the loop won't be the next item in the ArrayList because the list has changed.

    Edit: no you're not removing items in the loop so ignore that, but again please please fix your indenting. It shows that you respect our efforts and free time if you put in efforts to make it easier for us to read your code.

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