How to Generate Strings with Placeholders in Java?

Question

How can I generate strings with placeholders in Java?

String template = "hello {};";
String formattedString = replacePlaceholder(template, "world");

Answer

Generating formatted strings with placeholders in Java can be easily achieved using various libraries, such as Apache Commons Lang or StringTemplate. These libraries simplify the process of replacing placeholders with actual values, making your code cleaner and more maintainable.

import org.apache.commons.text.StringSubstitutor;

String template = "hello {name}!";
Map<String, String> valuesMap = new HashMap<>();
valuesMap.put("name", "world");
StringSubstitutor sub = new StringSubstitutor(valuesMap);
String formattedString = sub.replace(template); // Result: 'hello world!'

Causes

  • Need for string templating in applications
  • Desire for readable and maintainable string formatting.
  • Repetitive tasks of string concatenation or formatting.

Solutions

  • Use Apache Commons Lang's StringUtils for placeholder replacement.
  • Consider StringTemplate for complex templating requirements.
  • Utilize MessageFormat for basic formatting needs.

Common Mistakes

Mistake: Not including the correct library in the project dependencies.

Solution: Ensure to add the necessary dependency for Apache Commons Lang or StringTemplate in your project.

Mistake: Using incorrect placeholder syntax in the string template.

Solution: Double-check the placeholder syntax, e.g., use `{name}` with Commons Text.

Mistake: Failing to handle null or absent replacements.

Solution: Implement checks for null values in your code to prevent unexpected behavior.

Helpers

  • Java string templating
  • generate strings with placeholders Java
  • Apache Commons Lang string replacement
  • StringTemplate Java example
  • Java formatted strings

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