pillers

public class Perecroika {

	public static void main(String[] args) {

		// use knowledge to change the world

		String s = "Education is the most powerful weapon which you can use to change the world";
		String t = "An investment in knowledge pays the best interest";
		System.out.println(s.substring(52, 56) + (t.substring(17, 27)) + s.substring(56, 75));
	}

pillers

public class VozvratDouble {

	public static void main(String[] args) {
		double value = 25.6;
		int celoe = (int) value / 1;
		double ostatok = value % 1;
		System.out.println(celoe);
		System.out.println(ostatok);

	}

pillers

public class VivodVremeni {

	public static void main(String[] args) {
		long sec = System.currentTimeMillis() / 1000;
		int min = (int) sec / 60;
		int chas = (int) min / 60;
		int den = (int) chas / 24;
		System.out.println(den + ":" + chas + ":" + min + ":" + sec);
	}

pillers

public class PoleBoy {

	public static void main(String[] args) {
		System.out.println("B B B B B B B B B");
		System.out.println("B C             B");
		System.out.println("B      W      C B");
		System.out.println("B        R      B");
		System.out.println("B B B       B B B");
		System.out.println("B       R       B");
		System.out.println("B T       W     B");

pillers

public class ZamenaPodstroki {

	public static void main(String[] args) {

		String mjQuote = "Let us always meet each other with smile, for the smile is the beginning of love.";
		String zamena = mjQuote.replace("smile", ":)");
		System.out.println(zamena);
	}

}

pillers

public class Podstroka_1 {

	
	public static void main(String[] args) {
		String mjQuote = "I'm failed over and over again in my life and that is why I succeed!";
		System.out.println(mjQuote.substring(mjQuote.length() - "again in my life and that is why I succeed!".length(), 
				mjQuote.length() - "in my life and that is why I succeed!".length()));

	}

pillers

public class Podstroka {

	public static void main(String[] args) {
		System.out.println("I'm failed over and over again in my life and that is why I succeed!".substring(59, 67));
/*Требование первого ограничения пока не дошло*/
	}

}

pillers

public class PoslednySymvol {

	public static void main(String[] args) {
		String mjQuote = "I'm failed over and over again in my life and that is why I succeed!";
		System.out.println(mjQuote.length());
		System.out.println(mjQuote.charAt(67));
	}

}

pillers

public class MetodRazmer {

	public static void main(String[] args) {
		String name = "Bogdan";
		System.out.println(name.length());

	}

}

pillers

public class Stroki {

	public static void main(String[] args) {
		System.out.println("Привет ДЖАВА"); // напечатайте любую строку
		System.out.println("Привет " + "ДЖАВА"); // напечатайте любую строку c конкатенацией
		System.out.println("Привет ДЖАВА " + 25 + " раз"); // сложите строку c числом
		System.out.print("Привет ДЖАВА " + 25 + " раз"); // используйте System.out.print
		System.out.print("            "); // возможно ли вывести на экран пустую строку?
	}