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  1.  
  2.  
  3. import java.util.*;
  4. import java.lang.*;
  5. import java.io.*;
  6.  
  7. class MyDuplicateEntry {
  8.  
  9.     public static void main(String a[]){
  10.         String[] strArr = {"one","two","three","four","four","five"};
  11.         TreeSet<String> unique = new TreeSet<String>();
  12.         for(String str:strArr){
  13.             if(!unique.add(str)){
  14.                 System.out.println("Duplicate Entry is: "+str);
  15.             }
  16.         }
  17.     }
  18. }
Success #stdin #stdout 0.05s 4386816KB
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Standard input is empty
stdout
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Duplicate Entry is: four
https://ideone.com/Ia3whW
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
secret

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