jshield jshield - 2 months ago 17
Java Question

cannot make a static reference to the non-static field

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;
}
}

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 balance, double depositAmount) {
    balance = balance + depositAmount;
}   

and remove the balance parameter from the call

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