Concept explainers
Explanation of Solution
Method “rarest()” to return the integer value that occurs fewer times in the map:
//Import required packages
import java.util.HashMap;
import java.util.Map;
import java.util.TreeMap;
//Definition of class Test
public class Test
{
//Definition of main class
public static void main(String[] args)
{
//Create a map
Map<String, Integer> valueMap = new HashMap<>();
// Adding key-value pairs to a HashMap
valueMap.put("Jack", 56);
valueMap.put("Lilo", 45);
valueMap.put("Sherlin", 25);
valueMap.put("Liya", 75);
valueMap.put("Leson", 45);
valueMap.put("Zen", 17);
valueMap.put("Benith", 25);
//Call the method "valueMap"
System.out.println( rarest(valueMap));
}
//Definition of method rarest
public static int rarest(Map<String, Integer> mVal)
{
//Check whether the map is empty
if (mVal == null || mVal.isEmpty())
{
//Throw the exception error
throw new IllegalArgumentException();
}
//Create an object for counts
Map<Integer, Integer> counts = new TreeMap<Integer, Integer>();
//Traverse the map set
for (String name : mVal.keySet())
{
//Assign the age value
int age = mVal.get(name);
//Check the condition for key
if (counts.containsKey(age))
{
//Assign the minimum age
counts...
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