Add elements in LinkedHashMap

We can use put() and putAll() methods of LinkedHashMap to add elements to LinkedHashMap

Object put(Object key, Object value);


Associates the specified value with the specified key in this map.

This method is used to add single key-value pair to the LinkedHashMap

Example

  1. import java.util.*;
  2. public class LinkedHashMapPutExample {
  3. public static void main(String args[]) {
  4.  
  5. LinkedHashMap<Integer,String> lhm = new LinkedHashMap<>();
  6.  
  7. lhm.put(1, "One");
  8. lhm.put(2, "Two");
  9. lhm.put(3, "Three");
  10.  
  11. System.out.println(lhm);
  12.  
  13. }
  14. }
import java.util.*;
public class LinkedHashMapPutExample {
public static void main(String args[]) {

LinkedHashMap<Integer,String> lhm = new LinkedHashMap<>();

lhm.put(1, "One");
lhm.put(2, "Two");
lhm.put(3, "Three");

System.out.println(lhm);

}
}


void putAll(Map m);


Copies all of the mappings from the specified map to this map.

This method is used to add all key-value pairs from another Map to this Map
Example

  1. import java.util.*;
  2. public class LinkedHashMapPutAllExample {
  3. public static void main(String args[]) {
  4.  
  5. LinkedHashMap<Integer,String> lhm = new LinkedHashMap<>();
  6.  
  7. lhm.put(1, "One");
  8. lhm.put(2, "Two");
  9. lhm.put(3, "Three");
  10.  
  11. LinkedHashMap<Integer,String>  lhm1 = new LinkedHashMap<>();
  12. lhm1.put(4, "Four");
  13. lhm1.put(5, "Five");
  14.  
  15. lhm.putAll(lhm1);
  16. System.out.println(lhm);
  17.  
  18. }
  19. }
import java.util.*;
public class LinkedHashMapPutAllExample {
public static void main(String args[]) {

LinkedHashMap<Integer,String> lhm = new LinkedHashMap<>();

lhm.put(1, "One");
lhm.put(2, "Two");
lhm.put(3, "Three");

LinkedHashMap<Integer,String>  lhm1 = new LinkedHashMap<>();
lhm1.put(4, "Four");
lhm1.put(5, "Five");

lhm.putAll(lhm1);
System.out.println(lhm);

}
}
Note : We can see that lhm1 has 2 key-value pairs and these 2 are added to main LinkedHashMap using putAll() 
           method

About the Author

Karibasappa G C (KB)
Founder of javainsimpleway.com
I love Java and open source technologies and very much passionate about software development.
I like to share my knowledge with others especially on technology 🙂
I have given all the examples as simple as possible to understand for the beginners.
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