The equals() method in SortedMap Java is used to check for equality between two SortedMap instances. It verifies whether the elements of one SortedMap passed as a parameter is equal to the elements of this SortedMap or not.
Syntax:
boolean equals(object obj)
Parameters: The method accepts one parameter obj of this map type and refers to the map whose equality is to be checked with this map.
Return Value: The method returns true if the equality holds for both the object map else it returns false.
Note: The equals() method in SortedMap is inherited from the Map interface in Java.
Below programs illustrate the equals() method:
Program 1:
// Java code to illustrate // the equals() method import java.util.*; public class Map_Demo { public static void main(String[] args) { // Creating an empty SortedMap SortedMap<Integer, String> map1 = new TreeMap<Integer, String>(); SortedMap<Integer, String> map2 = new TreeMap<Integer, String>(); // Mapping string values to int keys map1.put( 10 , "Geeks" ); map1.put( 15 , "4" ); map1.put( 20 , "Geeks" ); map1.put( 25 , "Welcomes" ); map1.put( 30 , "You" ); // Mapping string values to int keys map2.put( 10 , "Geeks" ); map2.put( 15 , "4" ); map2.put( 20 , "Geeks" ); map2.put( 25 , "Welcomes" ); map2.put( 30 , "You" ); // Displaying the Map1 System.out.println( "First Map: " + map1); // Displaying the Map2 System.out.println( "Second Map: " + map2); // Checking the equality System.out.println( "Equality: " + map1.equals(map2)); } } |
First Map: {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You} Second Map: {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You} Equality: true
Program 2:
// Java code to illustrate // the equals() method import java.util.*; public class Map_Demo { public static void main(String[] args) { // Creating an empty SortedMap SortedMap<Integer, String> map1 = new TreeMap<Integer, String>(); SortedMap<Integer, String> map2 = new TreeMap<Integer, String>(); // Mapping string values // to int keys for map1 map1.put( 10 , "Geeks" ); map1.put( 15 , "4" ); map1.put( 20 , "Geeks" ); map1.put( 25 , "Welcomes" ); map1.put( 30 , "You" ); // Mapping string values // to int keys for map2 map2.put( 10 , "Geeks" ); map2.put( 15 , "4" ); map2.put( 20 , "Geek" ); map2.put( 25 , "Welcomes" ); map2.put( 30 , "You" ); // Displaying the map 1 System.out.println( "First Map: " + map1); // Displaying the map 2 System.out.println( "Second Map: " + map2); // Displaying the equality System.out.println( "Equality: " + map1.equals(map2)); } } |
First Map: {10=Geeks, 15=4, 20=Geeks, 25=Welcomes, 30=You} Second Map: {10=Geeks, 15=4, 20=Geek, 25=Welcomes, 30=You} Equality: false
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Map.html#equals(java.lang.Object)
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