Classes, Constructors & Encapsulation

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public class BankAccount {
    private final String accountNumber;
    private double balance;
 
    public BankAccount(String accNum, double initial) {
        this.accountNumber = accNum;
        this.balance = Math.max(0, initial);
    }
 
    public void deposit(double amount) {
        if (amount > 0) this.balance += amount;
    }
 
    public double getBalance() { return this.balance; }
}