equals : Check for Sets Equality

public boolean equals(Object o)

Compare the given object with the set for equality. Returns true if the given object is also a set and the two sets has same elements.

import java.util.*;

class HashSetEquals{
 public static void main(String args[]){
  HashSet<Integer> mySet1  = new HashSet<> ();
  TreeSet<Integer> mySet2  = new TreeSet<> ();
  HashSet<Integer> mySet3  = new HashSet<> ();
  ArrayList<Integer> myList1 = new ArrayList<> ();
  
  for(int i=0; i < 5; i++){
   mySet1.add(i);
   mySet2.add(i);
   myList1.add(i);
  }
  
  mySet3.add(10);
  mySet3.add(20);
  
  System.out.print("\nElements in mySet1 ");
  System.out.println(mySet1);
  System.out.print("\nElements in mySet2 ");
  System.out.println(mySet2);
  System.out.print("\nElements in mySet3 ");
  System.out.println(mySet3);
  System.out.print("\nElements in myList1 ");
  System.out.println(myList1);
  
  System.out.print("\nIs mySet1 and mySet2 are equal ");
  System.out.println(mySet1.equals(mySet2));
  System.out.print("\nIs mySet1 and mySet3 are equal ");
  System.out.println(mySet1.equals(mySet3));
  System.out.print("\nIs mySet1 and myList1 are equal ");
  System.out.println(mySet1.equals(myList1));
 } 
}

Output

Elements in mySet1 [0, 1, 2, 3, 4]

Elements in mySet2 [0, 1, 2, 3, 4]

Elements in mySet3 [20, 10]

Elements in myList1 [0, 1, 2, 3, 4]

Is mySet1 and mySet2 are equal true

Is mySet1 and mySet3 are equal false

Is mySet1 and myList1 are equal false

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