CODEWITHSUNDEEP
lambdajava-8
Balaji
Balaji

Reputation: 191

Find maximum value of a attribute in a list of custom objects using lamdaj

I am trying to figure out a way to get the maximum value of an attribute and its object reference from a list containing custom objects.

Below is my code and I am supposed to use java 8 lambda expressions here. I am not allowed to use any of the google guava libraries.

My question is how can I determine whether the sequenceNumber attribute from CcarReportPreferenceConfig objects is in a list.

The sequence number will be like 1 or 2 or 3 or 4. If I have 5 objects of CcarReportPreferenceConfig and if each objects sequence number is like 1,2,3,4,5 I need to determine that 5 is the largest of all

List<CcarReportPreferenceConfig> ccarReportPreferenceConfigs = ccarReportPrefConfigMapper.ccarReportPrefConfigDTOsToCcarReportPrefConfigs(ccarReportPrefConfigDTOList);
for (CcarReportPreferenceConfig ccarReportPreferenceConfig : ccarReportPreferenceConfigs) {
   if (ccarReportPreferenceConfig.getSequenceNumber().intValue() == 1) {
       ccarReportPreferenceConfig.setRejectSequence("DQM");
   } else if (ccarReportPreferenceConfig.getSequenceNumber()==LargestNumber){
       ccarReportPreferenceConfig.setRejectSequence("DQM");
   } else {
       ccarReportPreferenceConfig.setRejectSequence("S2");
   }
}

Upvotes: 0

Views: 2083

Answers (1)

Jude Niroshan
Jude Niroshan

Reputation: 4460

public class MaxFromAList {

    int sequence = 0;
    String code = "";

    public String getCode() {
        return code;
    }

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

    public MaxFromAList(int sequence) {
        this.sequence = sequence;
    }

    public int getSequence() {
        return sequence;
    }

    public static void main(String[] args){

        List<MaxFromAList> list = new ArrayList<MaxFromAList>();
        list.add(new MaxFromAList(1111));
        list.add(new MaxFromAList(2));
        list.add(new MaxFromAList(654643));
        list.add(new MaxFromAList(41));
        list.add(new MaxFromAList(500));

        list.stream().max(Comparator.comparing(MaxFromAList::getSequence))
            .ifPresent(max -> max.setCode("MAXCODE"));

        list.stream().filter(i -> !i.getCode().equals("MAXCODE")).forEach(ele -> setIdentificationCode(ele));


        printMyList(list);
    }

    public static void setIdentificationCode(MaxFromAList element){
        switch (element.sequence){
            case 1:
                element.setCode("DQM");break;
            default:
                element.setCode("");
        }
    }

    public static void printMyList(List<MaxFromAList> mylist){
        mylist.stream().forEach( o -> System.out.println("Sequence : " + o.sequence + "  Code : "+ o.getCode()));
    }
}

Upvotes: 3

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