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    <p>You should override hashcode and equals method of Object class in your PlayerNames class.</p> <p>As you want to get on basis of OrigName instance variable only only so use only this in hashcode method while calculating hashcode and in equals method while comparison.</p> <p>EDIT: Updated your class</p> <p>class PlayerNames {</p> <pre><code> String OrigName; String TagName; //String DispName; PlayerNames(String OrigName,String TagName) { this.OrigName = OrigName; this.TagName = TagName; //this.DispName = DispName; } @Override public boolean equals(Object o){ if(o instanceof PlayerNames){ PlayerNames p = (PlayerNames)o; return ( p.OrigName == this.OrigName); } else return false; } @Override public int hashCode(){ int hashcode=0; int MOD=10007; int shift=29; for(int i=0;i&lt;OrigName.length();i++){ hashcode=((shift*hashcode)%MOD+OrigName.charAt(i))%MOD; } return hashcode; } @Override public String toString(){ return OrigName; } } </code></pre> <p>For put and get operations I have written below class</p> <pre><code>import java.util.HashMap; public class MainThread { public static void main(String[] args) { PlayerNames Bob = new PlayerNames(new String("Bob"),new String("BobsWindshield")); HashMap&lt;PlayerNames, Integer&gt; PlayerTempNeutral = new HashMap&lt;PlayerNames, Integer&gt;(); PlayerTempNeutral.put(Bob,100); Integer p = PlayerTempNeutral.get(Bob); System.out.println(p); } } </code></pre> <p>Use above code for experiment purpose only , as it is a bad coding practice. As you are a new java programmer understanding concepts is more important then best practice.</p>
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    1. COI'm pretty new at java so you have to elaborate :(
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    2. COplease go through http://howtodoinjava.com/2012/10/09/working-with-hashcode-and-equals-methods-in-java/ , It has sample class with equals and hashcode meethod
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    3. CO@GinzoMilani , in another answer Teeg has given good explanations but as you are new to java I will update my answer with your updated class.
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