Java EnumMap putAll() method

The putAll() method of Java EnumMap class is used to copy all the mappings from one EnumMap to a new EnumMap.

Syntax

Parameters

m - the map which is to be copied to the newer one.

Returns

This method does not return any value.

Exception

NullPointerException - if the given map is null, or if one or more keys in the given map are null.

Example 1

import java.util.*;
public class EnumMapPutAllExample1 {
   // create an enum  
   public enum Days {
	Monday,Tuesday, Wednesday, Thursday
   };
   public static void main(String[] args) {
   EnumMap<Days, String> map1 = new EnumMap<Days, String> (Days.class);
   EnumMap<Days, String> map2 = new EnumMap<Days, String> (Days.class);
	
   map1.put(Days.Monday, "1");
   map1.put(Days.Tuesday, "2");
   map1.put(Days.Wednesday, "3");	      
   // print map1 and map2
   System.out.println("Map1: "+map1);
   System.out.println("Map2: "+map2);
   // copy all the mappings from map1 to map2
   map2.putAll(map1);
   //print map1 and map2 again
   System.out.println("Map1: "+map1);
   System.out.println("Map2: "+map2);
  }
}

Test it Now

Output:

Map1: {Monday=1, Tuesday=2, Wednesday=3}
Map2: {}
Map1: {Monday=1, Tuesday=2, Wednesday=3}
Map2: {Monday=1, Tuesday=2, Wednesday=3}

Example 2

import java.util.*;
public class EnumMapPutAllExample2 {
   // create an enum  
   public enum Tutorial {
     Java, CSS, Python, Android, Javascript
   };
   public static void main(String[] args) {
   EnumMap<Tutorial, String> map1 = 
		   new EnumMap<Tutorial, String> (Tutorial.class);
   EnumMap<Tutorial, String> map2 = 
		   new EnumMap<Tutorial, String> (Tutorial.class);
	
   map1.put(Tutorial.Java, "1");
   map1.put(Tutorial.CSS, "2");
   map1.put(Tutorial.Python, "3");	  
   map1.put(Tutorial.Android, "4");	
   // print map1 and map2
   System.out.println("Map1: "+map1);
   System.out.println("Map2: "+map2);
   map2.putAll(map1);
   //print map1 and map2 again
   System.out.println("Map1: "+map1);
   System.out.println("Map2: "+map2);
  }
}

Test it Now

Output:

Map1: {Java=1, CSS=2, Python=3, Android=4}
Map2: {}
Map1: {Java=1, CSS=2, Python=3, Android=4}
Map2: {Java=1, CSS=2, Python=3, Android=4}

Next TopicJava EnumMap

← prev next →

Help Others, Please Share

Javatpoint Services

JavaTpoint offers too many high quality services. Mail us on [email protected], to get more information about given services.

Website Designing
Website Development
Java Development
PHP Development
WordPress
Graphic Designing
Logo
Digital Marketing
On Page and Off Page SEO
PPC
Content Development
Corporate Training
Classroom and Online Training
Data Entry

Training For College Campus

JavaTpoint offers college campus training on Core Java, Advance Java, .Net, Android, Hadoop, PHP, Web Technology and Python. Please mail your requirement at [email protected].
Duration: 1 week to 2 week

^{Like/Subscribe us for latest updates or newsletter}

Java EnumMap Class