string class

public class Main {
  public static void main(String[] args) {
    String outText = "";
    String text = "Шла Саша по шоссе и сосала сушку";
    String[] s = text.split(" ");
    for (String value : s) {
      String tmp = String.valueOf(value.charAt(0));
      if (tmp == tmp.toUpperCase()) {
         outText += " " + value;
      }
    }
    System.out.println(outText);
  }
}

if (tmp == tmp.toUpperCase()) {

if (tmp == tmp.toUpperCase()) {

import java.io.UnsupportedEncodingException;
import java.nio.charset.StandardCharsets;

public class MainTest {
    public static void main(String[] args) throws UnsupportedEncodingException {
        String outText = "";
        String text = new String("Шла Саша по шоссе и сосала сушку".getBytes(), StandardCharsets.UTF_8);
        String[] s = text.split(" ");
        for (String value : s) {
            String tmp = String.valueOf(value.charAt(0));
            if (tmp.equals(tmp.toUpperCase())) {
                outText += " " + value;
            }
        }
        System.out.println(outText);
    }
}

import java.io.PrintStream;
import java.nio.charset.StandardCharsets;

public class MainTest {
    public static void main(String[] args) {
        PrintStream ps = new PrintStream(System.out, true, StandardCharsets.UTF_8);
        StringBuilder outText = new StringBuilder();
        String text = new String("Шла Саша по шоссе и сосала сушку".getBytes(), StandardCharsets.UTF_8);
        String[] s = text.split(" ");
        for (String value : s) {
            String tmp = String.valueOf(value.charAt(0));
            if (tmp.equals(tmp.toUpperCase())) {
                outText.append(" ").append(value);
            }
        }
        ps.println(outText);
    }
}