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9.1: MonetaryCoin 设计并实现一个名为 MonetaryCoin 的类，该类派生自第 5 章中介绍的 Coin 类。在 MonetaryCoin 中存储一个表示其值的整数并添加一个返回其值的方法。添加一个 toString 方法，该方法在 Coin 的字符串表示中附加一个空格，后跟硬币的值。

司机。无需创建主驱动程序类，而是在 MonetaryCoin 类本身中包含一个 main 方法来练习该类的行为。您的方法应该创建一个包含 7 个 MonetaryCoin 对象的数组，其值为 1,5,10,25,50,100,100，然后遍历该数组，翻转每个硬币。然后该方法应再次遍历数组，调用 getValue 方法并将结果值相加。然后应将每个硬币的字符串表示形式单独打印在一行上，然后在一行上单独打印计算的值的总和（前面带有标签“总价值：”。

这就是问题所在，到目前为止我输入的代码是：

public class MonetaryCoin extends Coin


{ private int value; 
 public int getValue()
 { return value; } 
 public String toString() 
{ return super.toString() + " " + value; } 
public static void main(String [] args) 
{ int sum = 0;
MonetaryCoin[] coin = {1,5,10,25,50,100,100}; 
for(int i = 0;i<coin.length;i++)
 { coin[i].flip(); } 
for(int i = 0;i<coin.length;i++) 
{ sum += coin[i].getValue(); 
System.out.println(coin[i].toString()); } 
System.out.println(); 
System.out.println("Total Value: " + sum); } }

我收到一条错误响应：

MonetaryCoin.java:9: incompatible types
found   : int
required: MonetaryCoin
MonetaryCoin[] coin = {1,5,10,25,50,100,100}; 
                       ^
MonetaryCoin.java:9: incompatible types
found   : int
required: MonetaryCoin
MonetaryCoin[] coin = {1,5,10,25,50,100,100}; 
                         ^
MonetaryCoin.java:9: incompatible types
found   : int
required: MonetaryCoin
MonetaryCoin[] coin = {1,5,10,25,50,100,100}; 
                           ^
MonetaryCoin.java:9: incompatible types
found   : int
required: MonetaryCoin
MonetaryCoin[] coin = {1,5,10,25,50,100,100}; 
                              ^
MonetaryCoin.java:9: incompatible types
found   : int
required: MonetaryCoin
MonetaryCoin[] coin = {1,5,10,25,50,100,100}; 
                                 ^
MonetaryCoin.java:9: incompatible types
found   : int
required: MonetaryCoin
MonetaryCoin[] coin = {1,5,10,25,50,100,100}; 
                                    ^
MonetaryCoin.java:9: incompatible types
found   : int
required: MonetaryCoin
MonetaryCoin[] coin = {1,5,10,25,50,100,100};

我怎样才能让它工作？谢谢。

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