超級抽象類未被接受的子類參數父類

Question

此處的新手總數（感謝承擔）。我創建了一個抽象父類：

public abstract class Account { 


public double setInterestRate (double interestRate) { 

    return this. interestRate = interestRate/100; 


public abstract void withdraw(double amount); 


public void deposit(double amount) { 
    if (amount < 0) { // amount is invalid: exception occurs 
     throw new IllegalArgumentException("Error: Deposit cannot be a" 
      + " negative value."); 
    } else { 
    this.deposit = amount; 
    balance = balance + amount; 

    } 
} 

public void calculateBalance() { 

     double interestTotal = balance * setInterestRate(interestRate); 
     this.balance = balance + interestTotal; 

}  
public double annualEarnings (double interest) { 

    return this.interest = 1000 * setInterestRate(interestRate); 

}

在子類中我想的annualInterest變量作爲參數傳遞給super.annualEarnings（annualInterest）方法我在的toString（）調用：

public class CheckingAccount extends Account implements Overdraftable { 

protected double annualInterest = 1.0; 

@Override 
public String toString() { 

    return super.toString() + "\n"+ account + "\t\t" + deposit + "\t\t" 
     + withdrawAmt +"\t\t" + super.annualEarnings(annualInterest)+ "\t\t" + super.balance ; 

} 

我希望這種類型的打印出來：

======================================= 
AccNo. Deposit Withdraw Intr. NewBal 
======================================= 
101 200.00 0.00 10.00 1210.00 

凡INIT每年1000美元的簡單利息是10美元（又稱10.00英鎊），剩下的只是200美元的存款，加上1000美元的初始金額以及NewBal的10美元利息。

Answer 1

有些東西對我沒有任何意義。在父類中，計算年度收入的方法是採用名爲interest的變量，但隨後將其完全丟棄，並使用本地變量interestRate代替。

public double annualEarnings (double interest) { 

    return this.interest = 1000 * setInterestRate(interestRate); 
} 

我覺得應該是

public double annualEarnings (double interest) { 

     return this.interest = 1000 * setInterestRate(interest); 
    }