java/w3/BankAccount.java

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

    public BankAccount(){
        this("000000","未命名");
    }

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

    public void setOwnerName(String ownerName) {
        this.ownerName = ownerName;
    }

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

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

    // 查询余额的方法
    public double getBalance() {
        return this.balance;
    }

    // 获取账户号的方法（因为账户号不可修改，只提供getter）
    public String getAccountNumber() {
        return this.accountNumber;
    }

    // 获取户主姓名的方法
    public String getOwnerName() {
        return this.ownerName;
    }
}