Java Collection, HashMap Exercises: Get a set view of the keys contained in this map
Java Collection, HashMap Exercises: Exercise-11 with Solution
Write a Java program to get a set view of the keys contained in this map.
Sample Solution:-
Java Code:
import java.util.*;
public class Example11 {
public static void main(String args[]){
HashMap<Integer,String> hash_map= new HashMap<Integer,String>();
hash_map.put(1,"Red");
hash_map.put(2,"Green");
hash_map.put(3,"Black");
hash_map.put(4,"White");
hash_map.put(5,"Blue");
// get keyset value from map
Set keyset = hash_map.keySet();
// check key set values
System.out.println("Key set values are: " + keyset);
}
}
Sample Output:
Key set values are: [1, 2, 3, 4, 5]
Java Code Editor:
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Java: Tips of the Day
How to sort an ArrayList?
Collections.sort(testList); Collections.reverse(testList);
That will do what you want. Remember to import Collections though!
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