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compare objects in a TreeSet by two or more parameters

Annoying Alligator answered on February 15, 2023 Popularity 1/10 Helpfulness 1/10

answer compare objects in a TreeSet by two or more parameters

compare objects in a TreeSet by two or more parameters

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public class MyComparator implements Comparator<Dto> {
    @Override
    public int compare(final Dto address1, final Dto address2) {
        if (address1 == null && address2 == null) {
            return 0;
        }
        if (address1 == null && address2 != null) {
            return -1;
        }
        if (address1 != null && address2 == null) {
            return 1;
        }

        // here we know that both address1 and address2 are not null
        int result = 0;
        final String name1 = address1.getName();
        final String name2 = address2.getName();
		
      	// if you know that the name won't be null then you can skip those chekcs
        if (name1 == null && name2 == null) {
            result = 0;
        } else if (name1 == null && name2 != null) {
            result = -1;
        } else if (name1 != null && name2 == null) {
            result = 1;
        }
        else {
            result = name1.compareTo(name2);
        }

        //if the Names are the same then compare the Number
        if (result == 0) {
            if (address1.Number() < address2.Number()) {
                result = -1;
            } else if (address1.Number() > address2.Number()) {
                result = 1;
            } else {
                result = 0;
            }
        }

        //if the Numbers are the same then compare the Other Field
        if (result == 0) {
            if (address1.Other() < address2.Other()) {
                result = -1;
            } else if (address1.Other() > address2.Other()) {
                result = 1;
            } else {
                result = 0;
            }
        }

        return result;
}

Popularity 1/10 Helpfulness 1/10 Language java

Source: codereview.stackexchange.com

Tags: compare java parameters treeset

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Contributed on Feb 15 2023

Annoying Alligator

0 Answers Avg Quality 2/10

compare objects in a TreeSet by two or more parameters

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compare objects in a TreeSet by two or more parameters

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