Capitalize.java

import java.util.Arrays;

public class Capitalize {

    public static String capitalize (String x) {
        return x.substring(0,1).toUpperCase() + x.substring(1).toLowerCase();
    }
    public static void main(String[] args) {
        String text = "gabinete do deputado fulando de tal e de dona maria";

        String capitalized =
                Arrays.asList(text.split(" "))
                        .stream()
                        .map(x -> x.length() > 2 ? capitalize(x) : x)
                        .reduce((x,y) -> x + " " + y)
                        .orElse("");
        System.out.println(capitalized); // => Gabinete do Deputado Fulando de Tal e de Dona Maria
    }
}