import java.util.*;
public class Main {
	    public static void main(String[] args) {
        final String strs = "STRING : V\r\n" + "STRING : A\r\n" + "STRING : R\r\n" + "STRING : I\r\n" + "STRING : A\r\n"
                + "STRING : B\r\n" + "STRING : L\r\n" + "STRING : E\r\n" + "SPACE : null\r\n" + "SPECIAL : null\r\n"
                + "SPACE : null\r\n" + "NUMBER : 3\r\n" + "NUMBER : 4\r\n" + "SPACE : null\r\n" + "DIV : null\r\n"
                + "SPACE : null\r\n" + "NUMBER : 5\r\n" + "NUMBER : 6\r\n" + "SPACE : null\r\n" + "QUESTION : null";
        final List<ADVAObject> pattern = new ArrayList<>();
        for (final String str : strs.split("\r\n")) {
            final String[] parts = str.split(" : ");
            pattern.add(new ADVAObject(parts[0], parts[1].equals("null") ? null : parts[1]));
        }
        System.out.println("Original list: ");
        pattern.forEach(System.out::println);
        final List<ADVAObject> result = new ArrayList<>(pattern.size());
        for (int i = 0, size = pattern.size(); i < size; i++) {
            final ADVAObject curr = pattern.get(i);
            if (i == 0 || !pattern.get(i - 1).type.equals(curr.type)) {
                result.add(curr);
            } else {
                result.get(result.size() - 1).value += curr.value;
            }
        }
        System.out.println("Combined:");
        result.forEach(System.out::println);
    }
 
    public static class ADVAObject {
        String type = "";
        String value = "";
 
        public ADVAObject(final String type, final String value) {
            this.type = type;
            this.value = value;
        }
 
        @Override
        public String toString() {
            StringBuilder builder = new StringBuilder();
            builder.append("ADVAObject [type=").append(type).append(", value=").append(value).append("]");
            return builder.toString();
        }
    }
}

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