我有一個(gè)名為 savingAccount 的對(duì)象，當(dāng)我在 main 上創(chuàng)建兩個(gè)這種類(lèi)型的對(duì)象時(shí)，我可以設(shè)置用戶(hù)初始帳戶(hù)余額。當(dāng)我創(chuàng)建第一個(gè)對(duì)象時(shí)，初始值設(shè)置為 3000，當(dāng)我創(chuàng)建第二個(gè)對(duì)象時(shí)，我的第一個(gè)和第二個(gè)對(duì)象的初始值都設(shè)置為 2000首先，我認(rèn)為這與公共方法和類(lèi)有關(guān)，但我將它們?nèi)吭O(shè)置為私有、受保護(hù)等，問(wèn)題仍然存在。這是我的對(duì)象：public class SavingsAccount {private static double annualInterestRate = 0;private static double savingsBalance = 0;private static double monthlyInterest = 0;SavingsAccount(double savingsBalance){    this.savingsBalance = savingsBalance;}void setAnnualInterestRate(double annualInterestRate){    this.annualInterestRate = annualInterestRate;}private static void updateSavingsBalance(){    savingsBalance = savingsBalance + monthlyInterest;}double getSavingsBalance(){    return savingsBalance;}}這是我的司機(jī)：    SavingsAccount saver1 = new SavingsAccount(3000.00);    System.out.println("User 1 balance: " + saver1.getSavingsBalance()); // 3000    SavingsAccount saver2 = new SavingsAccount(2000.00);    System.out.println("User 2 balance: " + saver2.getSavingsBalance()); // 2000    //2000 for both now    System.out.println("User 1 balance: " + saver1.getSavingsBalance());    System.out.println("User 2 balance: " + saver2.getSavingsBalance());