类Test1、Test2定义如下:
1.public class Test1
2.{ public float aMethod(float a,float b)throws
3. IOException { }
4.}
5.public class Test2 extends Test1{
6.
7.}
将以下哪种方法插入行6是不合法的()
float aMethod(float a,float b){ }
public int aMethod(int a,int b)throws Exception{ }
public float aMethod(float p,float q){ }
public int aMethod(int a,int b)throws IOException{ }