/**

* Demonstates uses of Strings.

*/

public class StringsThings {

public static void main(String[] args) {

// Characters

String fruit = "banana";

char letter0 = fruit.charAt(0);

if (letter0 == 'a') {

System.out.println('?');

}

System.out.print("Roman alphabet: ");

for (char c = 'A'; c <= 'Z'; c++) {

System.out.print(c);

}

System.out.println();

System.out.print("Greek alphabet: ");

for (int i = 913; i <= 937; i++) {

System.out.print((char) i);

}

System.out.println();

// Strings are immutable

String name = "Alan Turing";

String upperName = name.toUpperCase();

String text = "Computer Science is fun!";

text = text.replace("Computer Science", "CS");

// String traversal

for (int i = 0; i < fruit.length(); i++) {

char letter = fruit.charAt(i);

System.out.println(letter);

}

for (char letter : fruit.toCharArray()) {

System.out.println(letter);

}

int length = fruit.length();

char last = fruit.charAt(length - 1); // correct

System.out.println(reverse(fruit));

// Substrings

System.out.println(fruit.substring(0));

System.out.println(fruit.substring(2));

System.out.println(fruit.substring(6));

System.out.println(fruit.substring(0, 3));

System.out.println(fruit.substring(2, 5));

System.out.println(fruit.substring(6, 6));

// The indexOf method

int index = fruit.indexOf('a');

int index2 = fruit.indexOf('a', 2);

// String comparison

String name1 = "Alan Turing";

String name2 = "Ada Lovelace";

if (name1.equals(name2)) {

System.out.println("The names are the same.");

}

int diff = name1.compareTo(name2);

if (diff == 0) {

System.out.println("The names are the same.");

} else if (diff < 0) {

System.out.println("name1 comes before name2.");

} else if (diff > 0) {

System.out.println("name2 comes before name1.");

}

// Wrapper classes

String str = "12345";

int num = Integer.parseInt(str);

num = 12345;

str = Integer.toString(num);

}

/**

* Reverses a string, returns a new String.

*/

public static String reverse(String s) {

String r = "";

for (int i = s.length() - 1; i >= 0; i--) {

r = r + s.charAt(i);

}

return r;

}

}