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Account.java

package com.masterdevskills.cha1;

public class Account {
    private int balance;
    
    public Account(int balance) {
        this.balance = balance;
    }
    
    public void transfer (int value, Account account) {
        synchronized (account) {
            synchronized (this) {
                balance = balance - value;
                account.deposit(value);
            }
        }
    }
    
    public void deposit(int value) {
        balance = balance + value;
    }

    public static void main(String[] args) {
        Account a = new Account(100);
        Account b = new Account(500);
        
        a.transfer(50, b);
    }
}