Java Collection, TreeMap Exercises: Get all keys from the given a Tree Map
Java Collection, TreeMap Exercises: Exercise-5 with Solution
Write a Java program to get all keys from the given a Tree Map.
Sample Solution:-
Java Code:
import java.util.*;
public class Example5 {
public static void main(String args[]){
// Create a tree map
TreeMap<String,String> tree_map1=new TreeMap<String,String>();
// Put elements to the map
tree_map1.put("C1", "Red");
tree_map1.put("C2", "Green");
tree_map1.put("C3", "Black");
tree_map1.put("C4", "White");
Set<String> keys = tree_map1.keySet();
for(String key: keys){
System.out.println(key);
}
}
}
Sample Output:
C1 C2 C3 C4
Java Code Editor:
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Java: Tips of the Day
getEnumMap
Converts to enum to Map where key is the name and value is Enum itself.
public static <E extends Enum<E>> Map<String, E> getEnumMap(final Class<E> enumClass) { return Arrays.stream(enumClass.getEnumConstants()) .collect(Collectors.toMap(Enum::name, Function.identity())); }
Ref: https://bit.ly/3xXcFZt
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