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PORemoving Specific Entries from ArrayList
 

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    <p>I have an array list with the following sample entries (Name &amp; Disease):</p> <pre><code>1. Name: Aimee Cholmondeley. Disease: German measles 2. Name: Colin Anissina. Disease: Diphtheria 3. Name: Colin Anissina. Disease: Malaria 4. Name: Aimee Cholmondeley. Disease: Typhoid fever 5. Name: Isaias Cheung. Disease: Haemophilus Influenza 6. Name: Isaias Cheung. Disease: Scarlet fever 7. Name: Sebastian Cutting. Disease: Gingivitis 8. Name: Juan Weiss. Disease: Acquired Immunodeficiency Sydrome (AIDS) 9. Name: Kaelyn Nauman. Disease: Amebiasis 10. Name: Kaelyn Nauman. Disease: Human Pulmonary Syndrome (HPS) 11. Name: Lyndsey Stapleton. Disease: Chlamydia 12. Name: Lyndsey Stapleton. Disease: Chlamydia </code></pre> <ul> <li><strong>Same Name, Different Disease -> Remove Both!</strong> </li> <li><strong>One Instance -> Keep</strong></li> <li><strong>Same Name, Same Disease -> Keep, but only one copy!</strong></li> </ul> <p>Now, for some reason, .equals isn't working. So I can't simply do <code>if (arrayList.get(i).equals(arrayList.get(j)) then remove</code>. So I'm comparing names and diseases individually, using <code>compareTo</code> for comparing the diseases (which is working).</p> <p>Here is what I tried:</p> <blockquote> <pre><code> for (int i = 0; i &lt; IDArray.size(); i++){ //IDArray contains all the elements int countFound = 0; IdenPerson curr1 = IDArray.get(i); for (int j = i + 1; j &lt; IDArray.size(); j++) { IdenPerson curr2 = IDArray.get(j); if (curr1.name.toString().equals(curr2.name.toString())) { //If Name is same if ((curr1.dis.toString().compareTo(curr2.dis.toString())) == 0) { // And Disease is same System.out.println(curr1.name.toString()); // Print that Name break; } } else { // If name is not same, and only repeated once ... how to do this? } } } </code></pre> </blockquote> <pre><code>public static class IdenPerson { String name; String dis; } </code></pre> <p>Using the above, I can find the double copy elements but I cannot separate the single instance elements. Please help! I cannot use libraries external to Java.</p> <p>Here's what the above ArrayList should look like when it works:</p> <pre><code>1. Name: Sebastian Cutting. Disease: Gingivitis 2. Name: Juan Weiss. Disease: Acquired Immunodeficiency Sydrome (AIDS) 3. Name: Lyndsey Stapleton. Disease: Chlamydia </code></pre>
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    1. COIf there are two entries with the same name but a different disease, *which* do you want to be removed?
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      1. USJon Skeet
    2. COI'd like both of them to be removed or not to copy them to another ArrayList. If they are exact duplicates, I want to print / copy one of them.
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      1. USTookTheRook
    3. COIt looks like Map of name -> disease (or list of diseases) will be better for you.
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      1. USBobTheBuilder
 

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