Access a class no package Java

Question

I have 2 classes A and B

class A:

// no package
public class A {
public doIt() {}
}

class B:

package com.abc;
public class B {
// A a = new A();
// a.doIt();
}

In class B, I want to access doIt() method of class A.

So, how do I do?

Help me.