gistfile1.java

package com.myapp.mobile;

public class Singleton
{
    private static Singleton instance = null;

    protected Singleton()
    {
        // Exists only to defeat instantiation
    }

    public static Singleton getInstance()
    {
        if (instance == null) {
            instance = new Singleton();
        }

        return instance;
    }
}

gistfile2.java

package com.myapp.mobile;

import com.myapp.mobile.Singleton;
import com.myapp.mobile.Customer;

public class MyAppApplication extends Singleton
{
    private Customer mCustomer;

    public Customer getCustomer() 
    {
        return this.mCustomer;
    }

    public void setCustomer(Customer aCustomer)
    {
        this.mCustomer = aCustomer;
    }
}