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POHow to compare two hashmaps in java?
 

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  1. POHow to compare two hashmaps in java?
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    <p>I have two hash maps like the following: </p> <pre><code>1.=============Employee================= Key : 1_10 : Value : 13/04/2012 Key : 1_11 : Value : 18/04/2012 Key : 1_12 : Value : 19/04/2012 Key : 1_14 : Value : 23/04/2012 Key : 1_13 : Value : 20/04/2012 Key : 1_16 : Value : 25/04/2012 Key : 1_1 : Value : 02/04/2012 Key : 1_15 : Value : 24/04/2012 Key : 1_18 : Value : 27/04/2012 Key : 1_3 : Value : 04/04/2012 Key : 1_17 : Value : 26/04/2012 Key : 1_2 : Value : 03/04/2012 Key : 1_5 : Value : 06/04/2012 Key : 1_19 : Value : 30/04/2012 Key : 1_4 : Value : 05/04/2012 Key : 1_7 : Value : 10/04/2012 Key : 1_6 : Value : 09/04/2012 Key : 1_9 : Value : 12/04/2012 Key : 1_8 : Value : 11/04/2012 2.=============Working day================= Key : 27 : Value : 27/4/2012 Key : 02 : Value : 02/4/2012 Key : 26 : Value : 26/4/2012 Key : 19 : Value : 19/4/2012 Key : 11 : Value : 11/4/2012 Key : 04 : Value : 04/4/2012 Key : 30 : Value : 30/4/2012 Key : 06 : Value : 06/4/2012 Key : 13 : Value : 13/4/2012 Key : 09 : Value : 09/4/2012 Key : 03 : Value : 03/4/2012 Key : 23 : Value : 23/4/2012 Key : 20 : Value : 20/4/2012 Key : 16 : Value : 16/4/2012 Key : 10 : Value : 10/4/2012 Key : 18 : Value : 18/4/2012 Key : 25 : Value : 25/4/2012 Key : 17 : Value : 17/4/2012 Key : 12 : Value : 12/4/2012 Key : 24 : Value : 24/4/2012 Key : 05 : Value : 05/4/2012 </code></pre> <p>Keys are not same but the values are same and sometime the values are not same.</p> <p>i want to find out the value which are not present in <code>employeemap</code> when comparing with <code>workingdaymap</code></p> <pre class="lang-java prettyprint-override"><code>if (!employeeMap.containsValue(workingdayMap.get(wKey))) { //take the value which is not present in employeeMap which is present in workingdayMap } </code></pre> <p>but it gives me null from employeeMap.</p> <p>Could you please help me to solve this?</p> <p>Regards Tony</p>
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    1. COCheck out `values()` function of `HashMap`.
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    2. COCould you provide more of the code that gives you `null`? Where does `wKey` come from? Which date type are you using, and does its `equals()` method do what you think it does?
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    3. COIterator<String> workingDayIterator = workingdayMap.keySet().iterator(); while(workingDayIterator.hasNext()){ String wKey= workingDayIterator.next(); if(!employeeMap.containsValue(workingdayMap.get(wKey))){ // get the values } }
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