BankAccount.java

class BankAccount {

  public void setName(String name) { 
    this.name = name;
  }
  
  public void setCustomerId(long customerId) {
    this.customerId = customerId
  }
  
  public void setRegisterDate(Date registerDate) {
    this.registerDate = registerDate;
  }
  
  public void setAmount(long amount) {
    this.amount = amount;
  }
  
  // コンストラクタその他は省略
  
}

BankAccount bankAccount = new BankAccount();
bankAccount.setName("会社用口座");
bankAccount.setCustomerId(userId);
bankAccount.setRegisterDate(now);
bankAccount.setAmount(100000L);