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POHashset allows duplicates?
 

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  1. POHashset allows duplicates?
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    <p>This question surely isn't a new one, but I didn't find any helpful answer anywhere.</p> <p>As you can see in the code below, the equals and hashcode methods are overriden, but it still allows duplicates. The Hashcode has been generated automatically by Netbeans.</p> <pre><code>@Override public boolean equals(Object o) { TaskDetails other = (TaskDetails) o; if ( (id_subtask == other.id_subtask) &amp;&amp; ((date.compareTo(other.date)) == 0) ) { System.err.println("Duplicate Entry"+id_subtask+" + "+other.id_subtask); return true; } else { System.out.println("Good!" +id_subtask+" + "+other.id_subtask); return false; } } @Override public int hashCode() { int hash = 7; hash = 71 * hash + this.id_subtask; hash = 71 * hash + this.id_team_member; hash = 71 * hash + Float.floatToIntBits(this.nb_hours); hash = 71 * hash + (this.date != null ? this.date.hashCode() : 0); hash = 71 * hash + (this.comment != null ? this.comment.hashCode() : 0); hash = 71 * hash + (this.subtask_name != null ? this.subtask_name.hashCode() : 0); System.out.println("Hash : "+hash + "Subtask : " + id_subtask); return hash; } </code></pre> <p>This the code used to add an entry into the hashset :</p> <pre><code>TaskDetails newTaskDetails = new TaskDetails ( s.getId_subtask(), mus.teamMember.getId_team_member(), f, mysqlFormat.format(caldate), c.substring(0, Math.min(c.length(), 100)), s.getName_subtask() ); allTasks.add(newTaskDetails); </code></pre> <p>(allTasks being the Hashset)</p> <p>This code is used in function A and B.</p> <p>If only function A is executed, it works fine. If function B is executed after function A (so the code above is executed twice), then the hashset suddenly accepts duplicates, even though system.err is triggered saying there is a duplicate entry?</p> <p>Is there a flaw in the code, or am I just missing something?</p> <p>Thanks for the help!</p>
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    1. USXaviraan
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    1. COI suspect something manipulating newTaskDetails due to which hashvalue is being changed.
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    2. COfor what class are you overriding those methods?
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      1. USNikolay Kuznetsov
    3. COWhat do you mean precisely by "accepts duplicates"? Is the entire object the same, or do you just mean dupicate ids?
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      1. USZutty
 

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