STRINGS

String str = "Hello";

    for(int i=0; i < str.length(); i++){
        System.out.println(str.charAt(i));
    }

/////////////////////////////////////////////////////////////////////////////////////////////////

String str = "SoftUni";
        System.out.println(str);
        for (int i = 0; i < str.length(); i++) {
            System.out.printf("str[%d] = %s\n", i, str.charAt(i));
        }
        System.out.println(str.indexOf("Uni")); // 4
        System.out.println(str.indexOf("uni")); // -1 (not found)
        System.out.println(str.substring(4, 7)); // Uni
        System.out.println(str.replace("Soft", "Hard")); // HardUni
        System.out.println(str.toLowerCase()); // softuni
        System.out.println(str.toUpperCase()); // SOFTUNI

        String firstName = "Steve";
        String lastName = "Jobs";
        int age = 56;
        System.out.println(firstName + " " + lastName +
            " (age: " + age + ")"); // Steve Jobs (age: 56)
        String allLangs = "C#, Java; HTML, . .. . . CSS; PHP, SQL";
        String[] langs = allLangs.split("[,. ;]+");
        for (String lang : langs) {
            System.out.println(lang);
        }
        System.out.println("Langs = " + String.join(", ", langs));

        System.out.println("  \n\n Software   University         \r    ".trim());


////////////////////////////////////////////////////////////////////////////////////////

String[] words = "yes yes".split(" ");
        System.out.println("words[0] = " + words[0]);
        System.out.println("words[1] = " + words[0]);

        System.out.println(words[0] == words[1]); // false
        System.out.println(words[0].equals(words[1])); // true

        if (words[0] == words[1]) {
            System.out.println("words[0] == words[1]");
        } else {
            System.out.println("words[0] != words[1]");
        }

        if (words[0] == "yes") {
            System.out.println("words[0] == yes");
        } else {
            System.out.println("words[0] != yes");
        }

        if (words[0].equals(words[1])) {
            System.out.println("words[0].equals(words[1])");
        }

        if (words[0].equals("yes")) {
            System.out.println("words[0].equals(\"yes\")");
        }

        System.out.println("Alice".compareTo("Mike")); // < 0
        System.out.println("Alice".compareTo("Alice")); // == 0
        System.out.println("Mike".compareTo("Alice")); // > 0

        if ("Alice".compareTo("Mike") < 0) {
            System.out.println("Alice < Mike");
        }

        if ("Alice".compareTo("Alice") == 0) {
            System.out.println("Alice == Alice");
        }

        if ("Mike".compareTo("Alice") > 0) {
            System.out.println("Mike > Alice");
        }