Java/com/study/demo2/Account.java

package com.study.demo2;

public class Account {
    private String accountId;
    private String owner;
    private double balance;

    public Account(String accountId, String owner, double balance) {
        this.accountId = accountId;
        this.owner = owner;
        this.balance = balance;
    }

    public void deposit(double amount) {
        if (amount > 0) {
            balance += amount;
        }
    }

    public void withdraw(double amount) {
        if (amount > 0 && amount <= balance) {
            balance -= amount;
        }
    }

    public void transfer(Account target, double amount) {
        if (amount > 0 && amount <= balance) {
            this.balance -= amount;
            target.balance += amount;
        }
    }

    public double getBalance() {
        return balance;
    }
}