Java LinkedHashMap Set View Of Keys

Chapter: Collections Last Updated: 11-05-2016 18:30:44 UTC

Program:

            /* ............... START ............... */
                
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Set;

public class JavaLinkedHashMapKeySetView {

	public static void main(String[] args) {

		LinkedHashMap linkedHashMap = new LinkedHashMap();

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

		Set set = linkedHashMap.keySet();

		System.out.println("Set created from LinkedHashMap Keys contains :");
		// iterate through the Set of keys
		Iterator itr = set.iterator();
		while (itr.hasNext())
			System.out.println(itr.next());

		// remove 2 from Set
		set.remove("2");

		// check if original LinkedHashMap still contains 2
		boolean blnExists = linkedHashMap.containsKey("2");
		System.out.println("Does LinkedHashMap contain 2 : " + blnExists);
	}
}
                /* ............... END ............... */
        

Output

Set created from LinkedHashMap Keys contains :
1
2
3
Does LinkedHashMap contain 2 : false

Tags

Collection, LinkedHashMap Set View, Java

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