7 Countries Color Method

I have written out the assignment, which needs me to print seven different countries, its' color, and its' neighbors and then color them with 4 colors using a method. I figured out how to print, but cannot figure out how to color one of 4 colors - Blue, Yellow, Green, or Red. It should be random, like a method that checks for neighbors color and then assign one, so at the end none of the same colors touch each. I understand how to do it in my head, but don't have enough skills and knowledge about how to connect things, so I have no idea how to do it. Writing it in BlueJ. I would really appreciate some help, please. Thanks )

import java.util.*;

public class Solve
{
    public ArrayList<Country>countries;

public Solve()
{
    countries = new ArrayList<>();
    countries.add(new Country("Germany", "NONE", "Poland", "Czech Republic", "Austria", "Switzerland", "NONE", "NONE", "NONE"));
    countries.add(new Country("Poland", "NONE", "Germany", "Czech Republic", "Slovakia", "NONE", "NONE", "NONE", "NONE"));
    countries.add(new Country("Czech Republic", "NONE", "Poland", "Germany", "Austria", "Slovakia", "NONE", "NONE", "NONE"));
    countries.add(new Country("Slovakia", "NONE", "Czech Republic", "Hungary", "Austria", "Poland", "NONE", "NONE", "NONE"));
    countries.add(new Country("Hungary", "NONE", "Slovenia", "Slovakia", "Austria", "NONE", "NONE", "NONE", "NONE"));
    countries.add(new Country("Slovenia", "NONE", "Italy", "Hungary", "Austria", "NONE", "NONE", "NONE", "NONE"));
    countries.add(new Country("Italy", "NONE", "Slovenia", "Switzerland", "Austria", "NONE", "NONE", "NONE", "NONE"));
    countries.add(new Country("Austria", "NONE", "Italy", "Slovenia", "Hungary", "Slovakia", "Czech Republic", "Germany", "Switzerland"));
    countries.add(new Country("Switzerland", "NONE", "Italy", "Austria", "Germany", "NONE", "NONE", "NONE", "NONE"));
}
public void printData()
{
    String first = "NONE";
    String second  = "NONE";
    String third = "NONE";
    String fourth = "NONE";
    String fifth = "NONE";
    String sixth = "NONE";
    String seventh = "NONE";
    String color = "NONE";


    for(Country country:countries)
    {
        color = country.getColor().equals("NONE") ? "" :  (country.getColor() + ", ");
        first = country.getFirstNeighbor().equals("NONE") ? "" :  (country.getFirstNeighbor() + ", ");
        second = country.getSecondNeighbor().equals("NONE") ? "" :  (country.getSecondNeighbor() + ", ");
        third = country.getThirdNeighbor().equals("NONE") ? "" :  (country.getThirdNeighbor() + ", ");
        fourth= country.getFourthNeighbor().equals("NONE") ? "" :  (country.getFourthNeighbor() + ", ");
        fifth = country.getFifthNeighbor().equals("NONE") ? "" :  (country.getFifthNeighbor() + ", ");
        sixth = country.getSixthNeighbor().equals("NONE") ? "" :  (country.getSixthNeighbor() + ", ");
        seventh = country.getSeventhNeighbor().equals("NONE") ? "" :  (country.getSeventhNeighbor() + ", ");
        System.out.println("COUNTRY - " + country.getName() + " | COLOR - " + color + " | NEIGHBORS - " + first +  second + third + fourth + fifth + sixth + seventh);
    }  
} 
public void printNew()
{
    ...... 
}
}



import java.util.*;

public class Country
{
private String name;
private String currentColor;
private String country1;
private String country2;
private String country3;
private String country4;
private String country5;
private String country6;
private String country7;

    public Country(String nameIn, String originalColor, String firstCountry, String secondCountry, String thirdCountry, String fourthCountry, String fifthCountry, String sixthCountry, String seventhCountry)
{
    name = nameIn;
    currentColor = originalColor;
    country1 = firstCountry;
    country2 = secondCountry;
    country3 = thirdCountry;
    country4 = fourthCountry;
    country5 = fifthCountry;    
    country6 = sixthCountry;
    country7 = seventhCountry;
}
public String getName()
{
    return name;
}   
public String getColor()
{
    return currentColor;
}
public String getFirstNeighbor()
{
    return country1;
}
public String getSecondNeighbor()
{
    return country2;
}
public String getThirdNeighbor()
{
    return country3;
}
public String getFourthNeighbor()
{
    return country4;
}
public String getFifthNeighbor()
{
    return country5;
}
public String getSixthNeighbor()
{
    return country6;
}
public String getSeventhNeighbor()
{
    return country7;
}
}