adam bien's blog

Java TextBlocks and String#replace 📎

The (JDK 1.5) method String#replace is useful for the substitution of multiple occurrences of a placeholder.

In the following sample, two occurrences of the $name String were replaced with a single replace invocation:


@Test
public void textBlocks() {
    var message = """
        class $class{
            String $name;

            public String toString(){
                return this.$name;
            }
        }
        """.replace("$class", "Developer")
           .replace("$name", "firstName");
    System.out.println(message);
}

...prints:


class Developer{
    String firstName;

    public String toString(){
        return this.firstName;
    }
}

The old, JDK 1.5, String#replace method is useful for replacement of multiple placeholders with a single call, whereby the newer JDK 15 method: String#formatted relies on the Formatter syntax.

This post was inspired by the description of the: JEP 378: Text Blocks