Java 是否有任何数据字段变为；“静态”；没有明确声明？

我声明了没有“static”修饰符的私有数据字段，但是当我从一个方法调用该数据字段时。编译器表示，仅对一个数据字段“AnnualInterestate”和其他字段使用“对非静态方法的静态引用”似乎没问题

我还以同样的方式声明了其他数据，但它们没有问题。但在“AnnualInterestate”数据字段的情况下，它会给出错误

import java.util.Date;
import java.util.Scanner;
public class Account {
    private int id;
    private double balance;
    private double annualInterestRate;
    private java.util.Date dateCreated;
    public Account() {

    }
    public Account(int id, double balance, double interestRate) {
        this.id = id;
        this.balance = balance;
        this.annualInterestRate = interestRate;
        dateCreated = new java.util.Date();
    }
    public void setId(int id) {
        this.id = id;
    }
    public int getId() {
        return id;
    }
    public void setBalance(double balance) {
        this.balance = balance;
    }
    public double getBalance() {
        return balance;
    }
    public void setInterestRate(double annualInterestRate) {
        this.annualInterestRate = annualInterestRate;
    }
    public double getInterestRate() {
        return annualInterestRate;
    }
    public java.util.Date getDate(){
        return dateCreated;
    }
    public double getMonthlyInterestRate() {
    double  monthlyInterestRate = annualInterestRate/12.0;
        return monthlyInterestRate;
    }
    public double getmonthlyInterest() {
        double monthlyInterestRate = annualInterestRate/12.0;
        return monthlyInterestRate*balance;
    }
    public void withdraw(double balance) {
        this.balance-=balance;
    }
    public void deposit(double balance) {
        this.balance+=balance;
    }
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        int id;
        double balance,interestRate,mir;
        Scanner in = new Scanner(System.in);
        id = in.nextInt();
        balance = in.nextDouble();
        interestRate = in.nextDouble();
        Account Person = new Account(id, balance, interestRate);
        Person.withdraw(2500.0);
        Person.deposit(3000.0);
        mir = getmonthlyInterest();
        System.out.println(balance + " " + mir + " " + dateCreated);

    }

}

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希望能够顺利运行

稍微纠正一下使用Account类实例的主要方法：

public static void main(String[] args) {
        // TODO Auto-generated method stub
        int id;
        double balance,interestRate,mir;
        Scanner in = new Scanner(System.in);
        id = in.nextInt();
        balance = in.nextDouble();
        interestRate = in.nextDouble();
        Account myPerson = new Account(id, balance, interestRate);
        myPerson.withdraw(2500.0);
        myPerson.deposit(3000.0);
        mir = myPerson.getmonthlyInterest();
        System.out.println(balance + " " + mir + " " + myPerson.getDate());

    }

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你的意思是写

这个.annualInterestate

而不是

annualInterestate.this

？我还怀疑您可能在某个地方有一些

Person

类，与名为

Person

的变量冲突（注意，按照惯例，变量名应该以小写字符开头，并且可能与它们所代表的对象相关）。您的代码中所有“this”用法都是错误的。应该是

这个。

旁注：你真的不应该使用

日期，它已经过时了。相反，请使用
java.time
包中的类。此外，还应遵循java命名约定：变量名始终以小写开头。您的变量
Person
应该是
Person
。我是新java。然而，我做的更正仍然有同样的问题。