Response.java

public class Response {

    private String code;
    private Map<String, Object> data;
    private Long timestamp;
    private String checksum;

    public Response(String code, Map<String, Object> data, Long timestamp, String checksum) {
        this.code = code;
        this.data = data;
        this.timestamp = timestamp;
        this.checksum = checksum;
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }

    public Map<String, Object> getData() {
        return data;
    }

    public void setData(Map<String, Object> data) {
        this.data = data;
    }

    public Long getTimestamp() {
        return timestamp;
    }

    public void setTimestamp(Long timestamp) {
        this.timestamp = timestamp;
    }

    public String getChecksum() {
        return checksum;
    }

    public void setChecksum(String checksum) {
        this.checksum = checksum;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Response response = (Response) o;

        if (code != null ? !code.equals(response.code) : response.code != null) return false;
        if (data != null ? !data.equals(response.data) : response.data != null) return false;
        if (timestamp != null ? !timestamp.equals(response.timestamp) : response.timestamp != null) return false;
        return checksum != null ? checksum.equals(response.checksum) : response.checksum == null;
    }

    @Override
    public int hashCode() {
        int result = code != null ? code.hashCode() : 0;
        result = 31 * result + (data != null ? data.hashCode() : 0);
        result = 31 * result + (timestamp != null ? timestamp.hashCode() : 0);
        result = 31 * result + (checksum != null ? checksum.hashCode() : 0);
        return result;
    }

    @Override
    public String toString() {
        return "Response{" +
                "code='" + code + '\'' +
                ", data=" + data +
                ", timestamp=" + timestamp +
                ", checksum='" + checksum + '\'' +
                '}';
    }
}