interface InA extends Cloneable {
    public void method1();
    public Object clone() throws CloneNotSupportedException;
}

class C1 implements InA {
    public void method1(){}
    public Object clone() throws CloneNotSupportedException {return super.clone();}
}

public class C2 {
    public static void main(String[] args) throws Exception {
        InA a = new C1();
        Object b = a.clone(); //出错，不能这样写，需要怎么实现这个功能？
        System.out.println(a);
        System.out.println(b);
    }
}