Temat: Programowanie - temat ogólny

private int x;
public void setX(val){ this.x = val; }
public int getX(){ return this.x; }

XYZbutton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {

                XYZbutton.setText("To jest zmieniona nazwa");
            }
        });

XYZbutton.addActionListener(e -> {
            XYZbutton.setText("To jest zmieniona nazwa");
        });

import java.util.Scanner;
public class SquareRoot
{
	public static void main(String[]args)
	{
		Scanner keyboard = new Scanner(System.in);
		System.out.println("\n" + "\t" + "SQUARE ROOT!");
		System.out.println("Enter a number: ");
		double number = keyboard.nextDouble();
		double root;
		while(number <= 0) {
			System.out.println("You can't take the square root of a negative number.");
			System.out.println("Try again: ");
			number = keyboard.nextDouble();
		}
		root = Math.sqrt(number);
		System.out.println("The square root of " + number + " is " + root + ".");
	}
}