If you want to initialize an empty AccountType object, then you need to add a no argument default constructor.
public AccountType() { }
If you need to set class variables after the object is initialized then you will need to add the appropriate setter methods.
public void setAccountType(String accountNameType){
this.accountNameType = accountNameType;
}
public void setInterestRate(float interestRate){
this.interestRate = interestRate;
}
So in your main class.
AccountType accountType = new AccountType();
accountType.setAccountType("savings");
accountType.setInterestRate(10.0);
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solved Constructor with two arguments Java