java/w3/BankAccount.java

public class BankAccount {
    // 私有属性
    private final String accountNumber;
    private String ownerName;
    private double balance;
    
    // 构造方法
    public BankAccount(String accountNumber, String ownerName) {
        this.accountNumber = accountNumber;
        this.ownerName = ownerName;
        this.balance = 0.0;
    }
    
    // Getter 方法
    public String getAccountNumber() {
        return accountNumber;
    }
    
    public String getOwnerName() {
        return ownerName;
    }
    
    public double getBalance() {
        return balance;
    }
    
    // Setter 方法
    public void setOwnerName(String ownerName) {
        this.ownerName = ownerName;
    }
    
    // 存款操作
    public void deposit(double amount) {
        if (amount > 0) {
            balance += amount;
            System.out.println("存款成功！当前余额：" + balance);
        } else {
            System.out.println("存款金额必须大于 0");
        }
    }
    
    // 取款操作
    public void withdraw(double amount) {
        if (amount > 0) {
            if (amount <= balance) {
                balance -= amount;
                System.out.println("取款成功！当前余额：" + balance);
            } else {
                System.out.println("余额不足，无法取款");
            }
        } else {
            System.out.println("取款金额必须大于 0");
        }
    }
    
    // 显示账户信息
    public void displayInfo() {
        System.out.println("账号：" + accountNumber);
        System.out.println("户主：" + ownerName);
        System.out.println("余额：" + balance);
        System.out.println();
    }
}