java/w3/BankAccount.java

public class BankAccount {
    
    private final String accountNumber;  
    private String ownerName;           
    private double balance;            

    
    public BankAccount(String accountNumber, String ownerName) {
        this.accountNumber = accountNumber;
        this.ownerName = ownerName;
        this.balance = 0.0;  
    }

    
    public String getAccountNumber() {
        return accountNumber;
    }

    
    public String getOwnerName() {
        return ownerName;
    }

    public void setOwnerName(String ownerName) {
        this.ownerName = ownerName;
        System.out.println("户主姓名已更新为：" + ownerName);
    }

   
    public double getBalance() {
        return balance;
    }

   
    public void deposit(double amount) {
        if (amount > 0) {
            balance += amount;
            System.out.println("存款成功！存入：" + amount + "，当前余额：" + balance);
        } else {
            System.out.println("存款失败：金额必须大于 0！");
        }
    }

    
    public void withdraw(double amount) {
        if (amount <= 0) {
            System.out.println("取款失败：金额必须大于 0！");
        } else if (amount > balance) {
            System.out.println("取款失败：余额不足！当前余额：" + balance);
        } else {
            balance -= amount;
            System.out.println("取款成功！取出：" + amount + "，当前余额：" + balance);
        }
    }

    
    public void displayInfo() {
        System.out.println("账户号：" + accountNumber);
        System.out.println("户主姓名：" + ownerName);
        System.out.println("当前余额：" + balance);
    }
}