cannot make a static reference to the non-static field

Question

I apologize ahead of time if this code isn t formatted correctly  trying to paste instead of retyping each line  If it isn t right  can someone tell me an easy way to paste multiple lines of code at once     My main question is that I keep getting an error message stating  Cannot make a static reference to the non-static field balance   I have tried making the methods static  with no result  and making the main method non-static by removing  static  from the header  but then I get the message  java lang NoSuchMethodError  main Exception in thread  main   Does anyone have any ideas  Any help is appreciated   public class Account        public static void main String   args            Account account   new Account 1122  20000  4 5            account withdraw balance  2500           account deposit balance  3000           System out println  Balance is     account getBalance             System out println  Monthly interest is      account getAnnualInterestRate   12            System out println  The account was created     account getDateCreated                private int id   0      private double balance   0      private double annualInterestRate   0      public java util Date dateCreated       public Account                public Account int id  double balance  double annualInterestRate            this id   id          this balance   balance          this annualInterestRate   annualInterestRate             public void setId int i            id   i             public int getID             return id             public void setBalance double b           balance   b             public double getBalance             return balance             public double getAnnualInterestRate             return annualInterestRate             public void setAnnualInterestRate double interest            annualInterestRate   interest             public java util Date getDateCreated             return this dateCreated             public void setDateCreated java util Date dateCreated            this dateCreated   dateCreated             public static double withdraw double balance  double withdrawAmount            double newBalance   balance - withdrawAmount          return newBalance             public static double deposit double balance  double depositAmount            double newBalance   balance   depositAmount          return newBalance

User · Answer

you can keep your withdraw and deposit methods static if you want however you d have to write it like the code below   sb   starting balance and eB   ending balance   Account account   new Account 1122  20000  4 5        double sB   Account withdraw account getBalance    2500       double eB   Account deposit sB  3000       System out println  Balance is     eB       System out println  Monthly interest is      account getAnnualInterestRate   12        account setDateCreated new Date         System out println  The account was created     account getDateCreated

User · Answer

main is a static method   It cannot refer to balance  which is an attribute  non-static variable    balance has meaning only when it is referred through an object reference  such as myAccount balance or yourAccount balance    But it doesn t have any meaning when it is referred through class  such as Account balance  whose balance is that      I made some changes to your code so that it compiles   public static void main String   args        Account account   new Account 1122  20000  4 5       account withdraw 2500       account deposit 3000     and   public void withdraw double withdrawAmount        balance -  withdrawAmount     public void deposit double depositAmount        balance    depositAmount

User · Answer

The static calls to withdraw and deposit are your problem          account withdraw balance  2500   This line can t work   since  balance  is an instance variable of Account  The code doesn t make much sense anyway  wouldn t withdraw deposit be encapsulated inside the Account object itself  so the withdraw should be more like   public void withdraw double withdrawAmount        balance -  withdrawAmount      Of course depending on your problem you could do additional validation here to prevent negative balance etc

User · Answer

the lines   account withdraw balance  2500   account deposit balance  3000     you might want to make withdraw and deposit non-static and let it modify the balance  public void withdraw double withdrawAmount        balance   balance - withdrawAmount     public void deposit double depositAmount        balance   balance   depositAmount         and remove the balance parameter from the call

User · Answer

Just write   private static double balance   0    and you could also write those like that   private static int id   0  private static double annualInterestRate   0  public static java util Date dateCreated

User · Answer

You are trying to access non static field directly from static method which is not legal in java  balance is a non static field  so either access it using object reference or make it static

[java] cannot make a static reference to the non-static field

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