- Java.util Package Classes
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- Java.util - EnumMap
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- Java.util - GregorianCalendar
- Java.util - HashMap
- Java.util - HashSet
- Java.util - Hashtable
- Java.util - IdentityHashMap
- Java.util - LinkedHashMap
- Java.util - LinkedHashSet
- Java.util - LinkedList
- Java.util - ListResourceBundle
- Java.util - Locale
- Java.util - Observable
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- Java.util - Properties
- Java.util - PropertyPermission
- Java.util - PropertyResourceBundle
- Java.util - Random
- Java.util - ResourceBundle
- Java.util - ResourceBundle.Control
- Java.util - Scanner
- Java.util - ServiceLoader
- Java.util - SimpleTimeZone
- Java.util - Stack
- Java.util - StringTokenizer
- Java.util - Timer
- Java.util - TimerTask
- Java.util - TimeZone
- Java.util - TreeMap
- Java.util - TreeSet
- Java.util - UUID
- Java.util - Vector
- Java.util - WeakHashMap
- Java.util Package Extras
- Java.util - Interfaces
- Java.util - Exceptions
- Java.util - Enumerations
- Java.util Useful Resources
- Java.util - Useful Resources
- Java.util - Discussion
Java EnumMap equals() Method
Description
The Java EnumMap equals(Object o) method compares the specified object with this map for equality.Both objects must be maps.
Declaration
Following is the declaration for java.util.EnumMap.equals() method
public boolean equals(Object o)
Parameters
o − the object to be compared for equality with this map.
Return Value
This method returns true if the specified object is equal to this map
Exception
NA
Checking Equality of an EnumMap of Enum, Integer Pairs Example
The following example shows the usage of Java EnumMap equals() method to compare the EnumMap instances. We've created a enum Numbers. Then two EnumMap instances are created of enum Numbers and Integer. Few entries are added and enumMap objects are compared.
package com.tutorialspoint; import java.util.EnumMap; public class EnumMapDemo { // create an enum public enum Numbers { ONE, TWO, THREE, FOUR, FIVE }; public static void main(String[] args) { EnumMap<Numbers, Integer> map1 = new EnumMap<>(Numbers.class); EnumMap<Numbers, Integer> map2 = new EnumMap<>(Numbers.class); // associate values in map1 map1.put(Numbers.ONE, 1); map1.put(Numbers.TWO, 2); map1.put(Numbers.THREE, 3); map1.put(Numbers.FOUR, 4); // associate values in map2 map2.put(Numbers.ONE, 1); map2.put(Numbers.TWO, 2); map2.put(Numbers.THREE, 3); map2.put(Numbers.FOUR, 4); // print the maps System.out.println("map1:" + map1); System.out.println("map2:" + map2); // check for equality between maps boolean equal = map1.equals(map2); // print the result System.out.println("Map1 and map 2 are equal:" + equal); // add one more value in map2 map2.put(Numbers.FIVE, 5); // check for equality between maps equal = map1.equals(map2); // print the result System.out.println("Map1 and map 2 are equal:" + equal); } }
Output
Let us compile and run the above program, this will produce the following result −
map1:{ONE=1, TWO=2, THREE=3, FOUR=4} map2:{ONE=1, TWO=2, THREE=3, FOUR=4} Map1 and map 2 are equal:true Map1 and map 2 are equal:false
Checking Equality of an EnumMap of Enum, String Pairs Example
The following example shows the usage of Java EnumMap equals() method to compare the EnumMap instances. We've created a enum Numbers. Then two EnumMap instances are created of enum Numbers and String. Few entries are added and enumMap objects are compared.
package com.tutorialspoint; import java.util.EnumMap; public class EnumMapDemo { // create an enum public enum Numbers { ONE, TWO, THREE, FOUR, FIVE }; public static void main(String[] args) { EnumMap<Numbers, String> map1 = new EnumMap<Numbers, String>(Numbers.class); EnumMap<Numbers, String> map2 = new EnumMap<Numbers, String>(Numbers.class); // associate values in map1 map1.put(Numbers.ONE, "1"); map1.put(Numbers.TWO, "2"); map1.put(Numbers.THREE, "3"); map1.put(Numbers.FOUR, "4"); // associate values in map2 map2.put(Numbers.ONE, "1"); map2.put(Numbers.TWO, "2"); map2.put(Numbers.THREE, "3"); map2.put(Numbers.FOUR, "4"); // print the maps System.out.println("map1:" + map1); System.out.println("map2:" + map2); // check for equality between maps boolean equal = map1.equals(map2); // print the result System.out.println("Map1 and map 2 are equal:" + equal); // add one more value in map2 map2.put(Numbers.FIVE, "5"); // check for equality between maps equal = map1.equals(map2); // print the result System.out.println("Map1 and map 2 are equal:" + equal); } }
Output
Let us compile and run the above program, this will produce the following result −
map1:{ONE=1, TWO=2, THREE=3, FOUR=4} map2:{ONE=1, TWO=2, THREE=3, FOUR=4} Map1 and map 2 are equal:true Map1 and map 2 are equal:false
Checking Equality of an EnumMap of Enum, Object Pairs Example
The following example shows the usage of Java EnumMap equals() method to compare the EnumMap instances. We've created a enum Numbers. Then two EnumMap instances are created of enum Numbers and Student objects. Few entries are added and enumMap objects are compared.
package com.tutorialspoint; import java.util.EnumMap; public class EnumMapDemo { // create an enum public enum Numbers { ONE, TWO, THREE, FOUR, FIVE }; public static void main(String[] args) { EnumMap<Numbers, Student> map1 = new EnumMap<>(Numbers.class); EnumMap<Numbers, Student> map2 = new EnumMap<>(Numbers.class); // associate values in map1 map1.put(Numbers.ONE, new Student(1, "Julie")); map1.put(Numbers.TWO, new Student(2, "Robert")); map1.put(Numbers.THREE,new Student(3, "Adam")); // associate values in map2 map2.put(Numbers.ONE, new Student(1, "Julie")); map2.put(Numbers.TWO, new Student(2, "Robert")); map2.put(Numbers.THREE,new Student(3, "Adam")); // print the maps System.out.println("map1:" + map1); System.out.println("map2:" + map2); // check for equality between maps boolean equal = map1.equals(map2); // print the result System.out.println("Map1 and map 2 are equal:" + equal); // add one more value in map2 map2.put(Numbers.FOUR, new Student(4, "Jene")); // check for equality between maps equal = map1.equals(map2); // print the result System.out.println("Map1 and map 2 are equal:" + equal); } } class Student { int rollNo; String name; Student(int rollNo, String name){ this.rollNo = rollNo; this.name = name; } @Override public String toString() { return "[ " + this.rollNo + ", " + this.name + " ]"; } @Override public boolean equals(Object obj) { if(obj == null) return false; Student s = (Student)obj; return this.rollNo == s.rollNo && this.name.equalsIgnoreCase(s.name); } }
Output
Let us compile and run the above program, this will produce the following result −
map1:{ONE=[ 1, Julie ], TWO=[ 2, Robert ], THREE=[ 3, Adam ]} map2:{ONE=[ 1, Julie ], TWO=[ 2, Robert ], THREE=[ 3, Adam ]} Map1 and map 2 are equal:true Map1 and map 2 are equal:false
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