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POfind duplicate words in java array and return array with unique duplicate words - use method
 

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  1. POfind duplicate words in java array and return array with unique duplicate words - use method
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    <p>I am new to java, and am confused with the problem. This is what I came up so far. I am still working on it, if I come up with any progress, I'll post it here.</p> <pre><code>public class charArray { public static void main(String[] args) { String[] strArray = new String[] {"apple", "ball", "cat", "apple", "ball", "apple"}; //output should be ["apple", "ball"] checkDuplicate(strArray); } public static String[] checkDuplicate(String[] strArray){ String[] newArray = new String[]{}; for(int i = 0; i &lt; strArray.length; i++){ for(int j = 0; j &lt; i; j++){ if (strArray[i].equals(srtArray[j])){ newArray = strArray[i]; } } } return newArray[]; } </code></pre> <p>}</p> <hr> <p>New progress: Ok, my mediocre head has gone this far: (and the solution works) It prints out the unique array of Duplicate elements. But now I need to implement the same code, by calling a method. Any help is appreciated.</p> <pre><code>import java.util.*; public class setChar { public static void main(String[] args) { String[] strArray = new String[] {"apple", "ball", "cat", "apple", "ball", "apple"}; Set set = new HashSet(); Set uniqueSet = new HashSet(); for(int i = 0; i &lt; strArray.length ; i++ ){ boolean b = set.add(strArray[i]); if(b == false){ uniqueSet.add(strArray[i]); } } Iterator it = uniqueSet.iterator(); while (it.hasNext()){ System.out.println(it.next()); } } } </code></pre> <p>The output is: <strong>ball apple</strong></p> <hr> <p>Finally implemented with method, with proper return type. Please let me know, if this can be further optimized. Thank all for you suggestions. Here is the working code:</p> <pre><code>public class retUnique { public static void main(String[] args) { String[] strArray = new String[] {"apple", "ball", "cat", "apple", "ball", "apple"}; System.out.println(printUnique(strArray)); } public static Set&lt;String&gt; printUnique(String[] strArray){ Set&lt;String&gt; set = new HashSet&lt;String&gt;(); Set&lt;String&gt; uniqueSet = new HashSet&lt;String&gt;(); for(int i = 0; i &lt; strArray.length ; i++ ){ boolean b = set.add(strArray[i]); if(b == false){ uniqueSet.add(strArray[i]); } } return(uniqueSet); } } </code></pre>
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    1. COCould try with a LinkedHashSet (I believe it is?) which will only allow unique entries even when you add multiple entries that are the same.
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    2. COwhat you want ro return, the unique words, or ghe dupplicates?
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      1. USAlexWien
    3. COAlexWien - I have to return unique words of just the duplicate words.
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      1. USjumbo
 

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