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App.java

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package string;

public class App {

public static void main(String[] args) {

String str = " Hello students, today is a good day ";

System.out.println(str.length()); //Size of string

System.out.println(str.contains("ello")); // Contains substring

System.out.println(str.replace('o','0')); // Replace single char

System.out.println(str.replace("ello","ELLO")); // Replace substring

System.out.println(str.charAt(0)); // Return char at index

System.out.println(str.compareTo("Hello students, today is a good day"));

boolean xx = "ddd".equals("ttt");

System.out.println(str.compareToIgnoreCase("HellO stUdents, today is a good day"));

System.out.println(str.concat(" - because today is Sunday"));

//System.out.println(str.indent(5)); // Set intend - отступ

var words = str.split(" ");

System.out.println(words[1]);

String url = "www.strings.com";

var domen = url.split("\\.")[1];

System.out.println(domen);

System.out.println(String.join("-",words));

System.out.println(str.trim()); // trim String

System.out.println(str.toLowerCase());

System.out.println(str.toUpperCase());

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

System.out.println(str.substring(str.length() - 3));

var name = "Some Name";

System.out.printf("My name is %s", name);

System.out.println();

System.out.println("My name is "+name);

}

}