//klasa 1

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Font;

import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextArea;
import javax.swing.border.Border;

public class Calculator {
	JFrame frame = new JFrame();
	JPanel panel = new JPanel();
	JTextArea textarea = new JTextArea(2,10);

	JButton button1 = new JButton();
	JButton button2 = new JButton();
	JButton button3 = new JButton();
	JButton button4 = new JButton();
	JButton button5 = new JButton();
	JButton button6 = new JButton();
	JButton button7 = new JButton();
	JButton button8 = new JButton();
	JButton button9 = new JButton();
	JButton button0 = new JButton();
	JButton buttonadd = new JButton();
	JButton buttonsub = new JButton();
	JButton buttonmul = new JButton();
	JButton buttondiv = new JButton();
	JButton buttonclear = new JButton();
	JButton buttondot = new JButton();
	JButton buttonequal = new JButton();
	public Calculator() {
		frame.setSize(340, 450);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setVisible(true);
		frame.setTitle("Kalkulator");

		frame.add(panel);
		panel.setBackground(Color.GRAY);
		Border border = BorderFactory.createLineBorder(Color.RED,4);
		panel.setBorder(border);

		panel.add(textarea);
		textarea.setBackground(Color.BLACK);
		Border tborder = BorderFactory.createLineBorder(Color.BLUE,3);

		textarea.setBorder(tborder);
		Font font = new Font("arial",Font.BOLD,33);
		textarea.setFont(font);
		textarea.setForeground(Color.WHITE);
		textarea.setPreferredSize(new Dimension(2,10));
		textarea.setLineWrap(true);

		panel.add(button1);
		panel.add(button2);
		panel.add(button3);
		panel.add(button4);
		panel.add(button5);
		panel.add(button6);
		panel.add(button7);
		panel.add(button8);
		panel.add(button9);
		panel.add(button0);
		panel.add(buttondot);
		panel.add(buttonsub);
		panel.add(buttonmul);
		panel.add(buttondiv);
		panel.add(buttonadd);
		panel.add(buttonequal);
		panel.add(buttonclear);
		}
	}


//klasa2

package calculator;

public class Main_calculator {

	public static void main(String[] args) {


	}

}