Question

当我想使用另一个类的方法时，我遇到了一些麻烦。

所以我必须在我的类AccountType中向控制台打印interestRate和帐户类型，在我的班级客户和我已经用我称之为BankAccount类的余额做得很好。

BankAccount balance = new BankAccount();

并且从只有一个参数的构造函数调用，但现在我想调用带有两个参数的构造函数，我得到一个错误。

       public void printAccountInformation()
       {
          BankAccount balance = new BankAccount(); // This work fine
          AccountType rate = new AccountType();   // but here i get error because the constructor in the account type takes two arguments
          AccountType type = new AccountType();   // but here i get error because the constructor in the account type takes two arguments

          System.out.println("Greetings dear: " + name); 
            System.out.println("Your street: " + street); 
             System.out.println("Your town " + town);
              System.out.println("Your postalCode " + postalCode);
               System.out.println("Your PhoneNumber " + telephoneNumber);
                System.out.println("User balance: " + balance.getBalance());
                System.out.println("User Account type: " + type.getAccountType());
                System.out.println("Your InterestRate Is: " + rate.getInterestRate());

   }

这是我的AccountType类

public class AccountType
{
  // Attributes

  private String accountNameType;
  private float interestRate = 0.0f;



  // Constructor 
  public AccountType(String types, float rate)
  {
      accountNameType = types;
      interestRate = rate;

  }
  // accessor 
  public String getAccountType()
    {
        return accountNameType;
    }

public float getInterestRate()
    {
        return interestRate;
    }

}

我在这里做错了什么？

Answer 1

只需传递＆＃34; typeName＆＃34;和＆＃34; interestRate＆＃34; by参数到你的构造函数

AccountType type = new AccountType("savings", 0.012f);

Answer 2

如果要初始化一个空的AccountType对象，则需要添加一个无参数的默认构造函数。

public AccountType() { }

如果需要在初始化对象后设置类变量，则需要添加适当的setter方法。

public void setAccountType(String accountNameType){
    this.accountNameType = accountNameType;
}

public void setInterestRate(float interestRate){
    this.interestRate = interestRate;
}

所以在你的主要班级。

AccountType accountType = new AccountType();
accountType.setAccountType("savings");
accountType.setInterestRate(10.0);

Answer 3

调用构造函数时需要设置参数：

AccountType acct = new AccountType("Type R", 1.0f);

Answer 4

将此项添加到您的AccountType类

public AccountType(){
}

带有两个参数Java的构造函数

4 个答案: