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Maps with multiple types of values in java
public class Person {

    private String name;
    private List<String> phoneNumbers = Collections.emptyList();

    public void setName(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setPhoneNumbers(List<String> phoneNumbers) {
        this.phoneNumbers = phoneNumbers;
    }

    public void addPhoneNumber(String number) {
        phoneNumbers.add(number);
    }

    public List<String> getPhoneNumbers() {
        return phoneNumbers;
    }
}

Map<String, Object>

class PhoneNumber {


  private String[] phoneNumbers;


  public void storePhoneNumber(String... phoneNumbers) {
     this.phoneNumbers = phoneNumbers;
  }

  public String getPhoneNumber() {
    if(phoneNumbers.length>=1) {
      return phoneNumbers[0];
    } else {
      return null;
    }

  }

  public List<String> getPhoneNumbers() {
    if(phoneNumbers!=null) {
      return Arrays.asList(phoneNumbers);
    } else {
      return null;
    }

  }

Map<String, Object> mixed = new HashMap<String, Object>();

Map<String, Serializable> mixed = new HashMap<String, Serializable>();

@SuppressWarnings("rawtypes")
Map mixed = new HashMap();