/*
Get Set view of Keys from Java LinkedHashMap example
This Java Example shows how to get a Set of keys contained in LinkedHashMap
using keySet method of Java LinkedHashMap class.
*/
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Set;
public class GetSetViewOfKeysFromLinkedHashMapExample {
public static void main(String[] args) {
//create LinkedHashMap object
LinkedHashMap lHashMap = new LinkedHashMap();
//add key value pairs to LinkedHashMap
lHashMap.put("1","One");
lHashMap.put("2","Two");
lHashMap.put("3","Three");
/*
get Set of keys contained in LinkedHashMap using
Set keySet() method of LinkedHashMap class
*/
Set st = lHashMap.keySet();
System.out.println("Set created from LinkedHashMap Keys contains :");
//iterate through the Set of keys
Iterator itr = st.iterator();
while(itr.hasNext())
System.out.println(itr.next());
/*
Please note that resultant Set object is backed by the LinkedHashMap.
Any key that is removed from Set will also be removed from
original LinkedHashMap object. The same is not the case with the element
addition.
*/
//remove 2 from Set
st.remove("2");
//check if original LinkedHashMap still contains 2
boolean blnExists = lHashMap.containsKey("2");
System.out.println("Does LinkedHashMap contain 2 ? " + blnExists);
}
}
/*
Output would be
Set created from LinkedHashMap Keys contains :
1
2
3
Does LinkedHashMap contain 2 ? false
*/
