TemplateStringReplacer

TemplateStringReplacer.java

import java.util.Map;

public class TemplateStringReplacer {

    public static String createStringFromTemplate(Map<String, Integer> map, String template) {
        StringBuilder stringBuilder = new StringBuilder();
        String[] elements = template.split("%");
        
        for (String element : elements) {
            if (element.equals("_")) {
                stringBuilder.append("_");
            } else if (map.containsKey(element)) {
                stringBuilder.append(map.get(element));
            } else {
                // If the element in the template is not found in the map,
                // TODO: you might want to discuss with the interviewer how to handle it.
                // For now, we do nothing.
            }
        }
        
        return stringBuilder.toString();
    }

    public static void main(String[] args) {
		// Using Java 9's of() method for simplicity.
        Map<String, Integer> map = Map.of("X", 123, "Y", 456); 
        String template = "%X%_%Y%";
        System.out.println(createStringFromTemplate(map, template));
    }
}