java/w3/Test.java

import java.util.Scanner;

public class Test {
    public static void main(String[] args){
        BankAccount account = new BankAccount("abc123","zj");

        System.out.println("当前余额：" + account.getBalance());

        account.deposit(500);
        account.deposit(-100);

        account.withdraw(200);
        account.withdraw(400);
        account.withdraw(-50);

        account.setOwnerName("ZJ123");
        System.out.println("修改后户主：" + account.getOwnerName());

        System.out.println("当前余额：" + account.getBalance());
    }
}

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) {
        if (ownerName == null || ownerName.isBlank()) {
            throw new IllegalArgumentException("invalid ownerName");
        }
        this.ownerName = ownerName.strip();
    }

    public double getBalance(){
        return balance;
    }

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

    public void withdraw(double amount){
        if (amount>0 && amount<=balance){
            balance -= amount;
            System.out.println("取款成功，当前余额为"+balance+"元");
        } else if (amount<=0){
            System.out.println("取款金额必须大于0");
        } else {
            System.out.println("取款金额不能超过当前余额");
        }
    }
}