Java Collection, HashMap Exercises: Remove all the mappings from a map
Java Collection, HashMap Exercises: Exercise-4 with Solution
Write a Java program to remove all the mappings from a map.
Sample Solution:-
Java Code:
import java.util.*;
public class Example4 {
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");
// print the map
System.out.println("The Original linked map: " + hash_map);
// Removing all the elements from the linked map
hash_map.clear();
System.out.println("The New map: " + hash_map);
}
}
Sample Output:
The Original linked map: {1=Red, 2=Green, 3=Black, 4=White, 5=Blue} The New map: {}
Java Code Editor:
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Previous: Copy all of the mappings from the specified map to another map.
Next: Check whether a map contains key-value mappings (empty) or not.
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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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