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  1. #1
    javahead is offline Member
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    Default problem with variables

    Hey! I'm new to all this so be kind :o! I am having trouble with variables, I get the following errors and don't know how to fix it! Any help would be greatly appreciated! Thanks!
    ----jGRASP exec: javac -g H:\insurance_sales.java

    insurance_sales.java:28: non-static variable carValue cannot be referenced from a static context
    carValue = 22000;
    ^
    insurance_sales.java:31: non-static variable carValue cannot be referenced from a static context
    carValue = 23000;
    ^
    insurance_sales.java:34: non-static variable carValue cannot be referenced from a static context
    carValue = 30000;
    ^
    insurance_sales.java:37: non-static variable carValue cannot be referenced from a static context
    carValue = 100000;
    ^
    insurance_sales.java:40: non-static variable carValue cannot be referenced from a static context
    carValue = 15000;
    ^
    insurance_sales.java:43: non-static variable carValue cannot be referenced from a static context
    carValue = 26000;
    ^
    insurance_sales.java:51: non-static variable fuelType cannot be referenced from a static context
    if ( fuelType = "Petrol" ) //IF statements assigns value to petrol/diesel
    ^
    insurance_sales.java:51: incompatible types
    found : java.lang.String
    required: int
    if ( fuelType = "Petrol" ) //IF statements assigns value to petrol/diesel
    ^
    insurance_sales.java:51: incompatible types
    found : int
    required: boolean
    if ( fuelType = "Petrol" ) //IF statements assigns value to petrol/diesel
    ^
    insurance_sales.java:52: non-static variable fuelType cannot be referenced from a static context
    fuelType = 350;
    ^
    insurance_sales.java:55: non-static variable fuelType cannot be referenced from a static context
    if ( fuelType = "Diesel")
    ^
    insurance_sales.java:55: incompatible types
    found : java.lang.String
    required: int
    if ( fuelType = "Diesel")
    ^
    insurance_sales.java:55: incompatible types
    found : int
    required: boolean
    if ( fuelType = "Diesel")
    ^
    insurance_sales.java:56: non-static variable fuelType cannot be referenced from a static context
    fuelType = 200;
    ^
    insurance_sales.java:62: cannot find symbol
    symbol : variable transmisson
    location: class insurance_sales
    switch (transmisson) {
    ^
    insurance_sales.java:64: cannot find symbol
    symbol : variable transmissonPrice
    location: class insurance_sales
    transmissonPrice = 200;
    ^
    insurance_sales.java:67: cannot find symbol
    symbol : variable transmissonPrice
    location: class insurance_sales
    transmissonPrice = 400;
    ^
    insurance_sales.java:79: non-static variable enginePrice cannot be referenced from a static context
    enginePrice = 300;
    ^
    insurance_sales.java:82: non-static variable enginePrice cannot be referenced from a static context
    enginePrice = 500;
    ^
    insurance_sales.java:85: non-static variable enginePrice cannot be referenced from a static context
    enginePrice = 600;
    ^
    insurance_sales.java:88: non-static variable enginePrice cannot be referenced from a static context
    enginePrice = 800;
    ^
    insurance_sales.java:91: non-static variable enginePrice cannot be referenced from a static context
    enginePrice = 1000;
    ^
    insurance_sales.java:96: non-static variable totalPrice cannot be referenced from a static context
    System.out.println("Premium payable " + totalPrice);
    ^
    23 errors

    ----jGRASP wedge2: exit code for process is 1.
    ----jGRASP: operation complete.


    My code looks like this

    public class insurance
    {

    String Name;
    String Address;
    String carName;
    String fuelType;
    String carValue;
    int Age;
    String transmission;
    int engineSize;




    public insurance (String Name, String Address, String carName, int Age,String Transmission, int engineSize)
    {
    this.Name = Name;
    this.Address = Address;
    this.carName = carName;
    this.Age = Age;
    this.transmission = transmission;
    this.engineSize = engineSize;
    }

    String Name()
    {
    return Name;
    }

    String Address()
    {
    return Address;

    }

    String carName()
    {
    return carName;
    }

    String transmisson()
    {
    return transmission;
    }

    String carValue()
    {
    return carValue;
    }
    String fuelType()
    {
    return fuelType;
    }


    int engineSize()
    {
    return engineSize;
    }
    }

    __________________________________________


    import java.util.Scanner;

    class insurance_sales //name of class
    {
    String Name = "";
    String Address = "";
    int carName = 0;
    int fuelType = 0;
    int transmissionPrice =0;
    int engineSize = 0;
    int carValue = 0;
    int enginePrice = 0;
    int totalPrice = carValue + fuelType + transmissionPrice + enginePrice;



    public static void main(String args[])
    {
    System.out.println("!Welcome to Cheap Insurances.Com!");
    System.out.println(" Please fill in the information, if you are eligible for cover, a quote will be given");
    Scanner scan = new Scanner(System.in);

    System.out.println("Please enter the make of car:");
    int carName = scan.nextInt();

    switch (carName) { //switch statement for the name of the car and to assign the values to each car
    case 1: System.out.println("Ford");
    carValue = 22000;
    break;
    case 2: System.out.println("Fiat");
    carValue = 23000;
    break;
    case 3: System.out.println("BMW");
    carValue = 30000;
    break;
    case 4: System.out.println("Ferrari");
    carValue = 100000;
    break;
    case 5: System.out.println("Opel");
    carValue = 15000;
    break;
    case 6: System.out.println("Alfa");
    carValue = 26000;
    break;
    default: System.out.println("Invalid Car.");break;
    }


    System.out.println("Please choose fuel type (Petrol/Diesel?):");
    String fuel = scan.nextLine();
    if ( fuelType = "Petrol" ) //IF statements assigns value to petrol/diesel
    fuelType = 350;

    else
    if ( fuelType = "Diesel")
    fuelType = 200;



    System.out.println("Please choose transmission type: Manual/Automatic");
    int transmission = scan.nextInt(); //switch statement to choose transmission type
    switch (transmisson) {
    case 1: System.out.println("Manual");
    transmissonPrice = 200;
    break;
    case 2: System.out.println("Automatic");
    transmissonPrice = 400;
    break;
    default: System.out.println("Invalid type");
    break;
    }


    System.out.println("Please enter engine size (In cc only eg. 1200cc, 2000cc");
    //IF statement to determine the engine size and price
    int engineSize = scan.nextInt();

    if ( engineSize >= 1200 )
    enginePrice = 300;
    else
    if ( engineSize >= 1400)
    enginePrice = 500;
    else
    if ( engineSize >= 1600)
    enginePrice = 600;
    else
    if ( engineSize >= 1800)
    enginePrice = 800;
    else
    if ( engineSize < 2000)
    enginePrice = 1000;




    System.out.println("Premium payable " + totalPrice);
    }
    }

  2. #2
    serjant's Avatar
    serjant is offline Senior Member
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    Ukraine,Zaporozhye
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    Default

    Java Code:
    class insurance_sales //name of class
    {
    String Name = "";
    String Address = "";
    [B]int carName = 0;[/B]
    int fuelType = 0;
    int transmissionPrice =0;
    int engineSize = 0;
    int carValue = 0;
    int enginePrice = 0;
    int totalPrice = carValue + fuelType + transmissionPrice + enginePrice;
    
    
    
    public static void main(String args[])
    {
    System.out.println("!Welcome to Cheap Insurances.Com!");
    System.out.println(" Please fill in the information, if you are eligible for cover, a quote will be given");
    Scanner scan = new Scanner(System.in);
    
    System.out.println("Please enter the make of car:");
    [B]int carName [/B]= scan.nextInt();
    Man you declared two times on one variable.Be attentive.

  3. #3
    CJSLMAN's Avatar
    CJSLMAN is offline Moderator
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    Default = != ==

    You have to correct the comparation operator in your "if" statements.
    Java Code:
    if ( fuelType [B][COLOR="Red"]=[/COLOR][/B] "Petrol" ) 
    .
    .
    .
    if ( fuelType [COLOR="red"][B]=[/B][/COLOR] "Diesel")
    Use "=="

    Luck,
    CJSL
    Chris S.
    Difficult? This is Mission Impossible, not Mission Difficult. Difficult should be easy.

  4. #4
    Sven is offline Member
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    Default

    You're referencing instance variables from within your main method, which is a static method (method belonging to the class, not to an instance). You need to instantiate your class first before referencing those variables.

  5. #5
    CJSLMAN's Avatar
    CJSLMAN is offline Moderator
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    Default Another one...

    Found another glitch...
    fuelType is define as an int, but is being compared against a string
    Java Code:
    [B][COLOR="Red"]int[/COLOR][/B] fuelType = 0;
    .
    .
    .
    if ( fuelType == [B][COLOR="red"]"Petrol"[/COLOR][/B] ) //this is the correct comparation I mentioned in my previous post
    Luck,
    CJSL
    Chris S.
    Difficult? This is Mission Impossible, not Mission Difficult. Difficult should be easy.

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