ReplaceAll with java8 lambda functions

Question

Given the following variables

templateText = \"Hi ${name}\";
variables.put(\"name\", \"Joe\");

I would like to replace the placeholder ${na

Answer 1

import java.util.HashMap;
import java.util.Map;

public class Repl {

    public static void main(String[] args) {
        Map variables = new HashMap<>();
        String templateText = "Hi, ${name} ${secondname}! My name is ${name} too :)";
        variables.put("name", "Joe");
        variables.put("secondname", "White");

        templateText = variables.keySet().stream().reduce(templateText, (acc, e) -> acc.replaceAll("\\$\\{" + e + "\\}", variables.get(e)));
        System.out.println(templateText);
    }

}

output:

Hi, Joe White! My name is Joe too :)

However, it's not the best idea to reinvent the wheel and the preferred way to achieve what you want would be to use apache commons lang as stated here.

 Map valuesMap = new HashMap();
 valuesMap.put("animal", "quick brown fox");
 valuesMap.put("target", "lazy dog");
 String templateString = "The ${animal} jumped over the ${target}.";
 StrSubstitutor sub = new StrSubstitutor(valuesMap);
 String resolvedString = sub.replace(templateString);