Set equals() method in Java with Examples
The equals() method of java.util.Set class is used to verify the equality of an Object with a Set and compare them. The method returns true if the size of both the sets are equal and both contain the same elements.
Syntax:
public boolean equals(Object o)
Parameters: This method takes the object o as a parameter to be compared for equality with this set.
Returns Value: This method returns true if the specified object is equal to this set.
Below are the examples to illustrate the equals() method.
Example 1:
import java.util.*;
public class GFG {
public static void main(String[] argv)
{
Set<String> arrset1 = new HashSet<String>();
arrset1.add( "A" );
arrset1.add( "B" );
arrset1.add( "C" );
arrset1.add( "D" );
arrset1.add( "E" );
System.out.println( "First Set: "
+ arrset1);
Set<String> arrset2 = new HashSet<String>();
arrset2.add( "A" );
arrset2.add( "B" );
arrset2.add( "C" );
arrset2.add( "D" );
arrset2.add( "E" );
System.out.println( "Second Set: "
+ arrset2);
boolean value = arrset1.equals(arrset2);
System.out.println( "Are both set equal? "
+ value);
}
}
|
Output:
First Set: [A, B, C, D, E]
Second Set: [A, B, C, D, E]
Are both set equal? true
Example 2:
import java.util.*;
public class GFG1 {
public static void main(String[] argv)
{
Set<Integer> arrset1 = new HashSet<Integer>();
arrset1.add( 10 );
arrset1.add( 20 );
arrset1.add( 30 );
arrset1.add( 40 );
arrset1.add( 50 );
System.out.println( "First Set: " + arrset1);
Set<Integer> arrset2 = new HashSet<Integer>();
arrset2.add( 10 );
arrset2.add( 20 );
arrset2.add( 30 );
System.out.println( "Second Set: " + arrset2);
boolean value = arrset1.equals(arrset2);
System.out.println( "Are both set equal? "
+ value);
}
}
|
Output:
First Set: [50, 20, 40, 10, 30]
Second Set: [20, 10, 30]
Are both set equal? false
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Set.html#equals(java.lang.Object)
Last Updated :
09 Aug, 2019
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