1. Resolve the use of names in the following Java program: 
    public class foobar {
    public foobar foobar = foobar();

    public foobar() {}

    public foobar foobar() {
        foobar foobar = new foobar();
        return foobar.foobar();
    }

    public static void main(String[] args) {
        new foobar().foobar().foobar.foobar();
    }
}

  2. We now modify the program by adding a package name: 
    package foobar;

public class foobar {
    public foobar.foobar foobar = foobar();

    public foobar() {}

    public foobar.foobar foobar() {
        foobar.foobar foobar = new foobar();
        return foobar.foobar();
    }

    public static void main(String[] args) {
        new foobar.foobar().foobar().foobar.foobar();
    }
}
    Explain how this changes the behavior of the name resolution.

  3. Construct a Java program that violates all the hierarchy well-formedness constraints.

  4. Fun challenge: construct a (legal?) Java program that crashes SUN's Java compiler during name resolution.