在Java中打印循環結果

Question

此代碼不起作用。我得到我似乎無法以下錯誤（在Eclipse）來解決：

語法錯誤，插入「:: IdentifierOrNew」完成ReferenceExpression
語法錯誤，插入「;」完成BlockStatements
重複的局部變量的興趣

import java.util.Scanner; 

public class DoWhile { 

    public static void main (String[] args) 
    { 
     Scanner in = new Scanner(System.in); 
     System.out.print("balance: "); 
     int balance = in.nextInt(); 
     System.out.print("interestRate: "); 
     double interestRate = in.nextDouble(); 
     System.out.print("year: "); 
     int year = in.nextInt(); 

     System.out.print("input: "); 
     String input = in.next(); 
     Integer interest = null; //to define interest  

     do 
     { 
      double interest = balance * interestRate/100; 
      balance += interest; 
      year++; // print current balance 
     } 
     while (input.equals("N")); 
     System.out.println("interest: " + interest + "balance: " + balance + "year: " + year) ; 
    }; 
} 

Answer 1

變量interest聲明兩次。

這裏是你的代碼稍微清理版本：

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