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Check if a particular value exists in Java TreeSet example

  1. /*
  2.   Check if a particular value exists in Java TreeSet example
  3.   This Java Example shows how to check if TreeSet object contains a particular
  4.   value using contains method of TreeSet class.
  5. */
  6.  
  7. import java.util.TreeSet;
  8.  
  9. public class CheckValueOfTreeSetExample {
  10.  
  11.   public static void main(String[] args) {
  12.    
  13.     //create TreeSet object
  14.     TreeSet tSet = new TreeSet();
  15.    
  16.     //add elements to TreeSet
  17.     tSet.add("1");
  18.     tSet.add("3");
  19.     tSet.add("2");
  20.     tSet.add("5");
  21.     tSet.add("4");
  22.    
  23.     /*
  24.       To check whether a particular value exists in TreeSet use
  25.       boolean contains(Object value) method of TreeSet class.
  26.       It returns true if the TreeSet contains the value, otherwise false.
  27.     */
  28.    
  29.     boolean blnExists = tSet.contains("3");
  30.     System.out.println("3 exists in TreeSet ? : " + blnExists);
  31.   }
  32. }
  33.  
  34. /*
  35. Output would be
  36. 3 exists in TreeSet ? : true
  37. */