[問題] constructor error(extends時)

[tanx (arctanx)]

新手發問
這是課本後面習題

class A
{
        int i;

        public A(int i)
        {
                this.i=i;
        }
}

public class Test extends A{
        public static void main(String[] arg){
                A aaa=new A(10);
                System.out.println(aaa.i);
        }
}


error message:
D:\java\debug>javac Test.java
Test.java:12: cannot find symbol
symbol  : constructor A()
location: class A
public class Test extends A{
       ^
1 error

請問
為什麼有錯ㄚ? 先謝謝摟~

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