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Count the duplicate elements in Arraylist in Java






Code


import java.util. * ;
import java.lang. * ;
import java.io. * ;

/* Name of the class has to be "Main" only if the class is public. */
class MyClass {
  public static void main(String[] args) throws java.lang.Exception {
    List < String > list = new ArrayList < String > ();
    list.add("Test");
    list.add("Test1");
    list.add("Test");

    Set < String > unique = new HashSet < String > (list);
    for (String key: unique) {
      System.out.println(key + ": " + Collections.frequency(list, key));
    }
  }
}



Output



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Posted By  -  Karan Gupta
 
Posted On  -  Saturday, January 21, 2017

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