Sample code used to test a prototype Apex Analysis tool using the new Spring'13 Tooling API.

SomeClassA.cls

public class SomeClassA
{
    public static void someMethod()
    {
        SomeClassB.someMethodB();
        someOtherMethod();
    }
    
    public static void someOtherMethod()
    {
    }
}

SomeClassB.cls

public class SomeClassB
{
    public static void someMethodB()
    {
        
    }
}

SomeClassC

public class SomeClassC
{
    public void myMethod()
    {
    }
}