Resúmenes

Come realizzare una calcolatrice come la seguente?

Per quanto riguarda il file Main.java:

package calcolatrice;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.GridLayout;
import javax.swing.BorderFactory;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

import calcolatrice.buttons.GenericButton;
import calcolatrice.buttons.NumberButton;
import calcolatrice.buttons.OperationButton;

public class Main {
    public static void main(String[] args) {
        JFrame f = new JFrame("Calc");
        JTextField numberArea = new JTextField();
        numberArea.setPreferredSize(new Dimension(300, 50));
        numberArea.setFont(new Font("arial",  Font.PLAIN, 48));
        numberArea.setHorizontalAlignment(JTextField.RIGHT);
        numberArea.setBorder(BorderFactory.createEmptyBorder());
        JPanel p = new JPanel();
        p.setLayout(new GridLayout(5, 4, 1, 1));
        JButton[] buttons = {
            new GenericButton("AC"),
            new GenericButton("+/-"),
            new GenericButton("%"),
            new OperationButton("/"),
            new NumberButton("7"),
            new NumberButton("8"),
            new NumberButton("9"),
            new OperationButton("X"),
            new NumberButton("4"),
            new NumberButton("5"),
            new NumberButton("6"),
            new OperationButton("-"),
            new NumberButton("1"),
            new NumberButton("2"),
            new NumberButton("3"),
            new OperationButton("+"),
            new NumberButton("0"),
            new GenericButton(","),
            new GenericButton("mod"),
            new OperationButton("=")
        };
        for(JButton b : buttons)
            p.add(b);
        f.add(numberArea, BorderLayout.NORTH);
        f.add(p, BorderLayout.CENTER); f.setSize(300, 450);
        f.setMinimumSize(new Dimension(300, 450)); f.setVisible(true);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

Per quanto riguarda il file OperationButton.java:

package calcolatrice.buttons;

import java.awt.Color;

public class OperationButton extends GenericButton {
    public OperationButton(String text) {
        super(text);
        setBackground(new Color(255,100,0));
        setForeground(Color.WHITE);
    }
}

Per quanto riguarda il file NumberButton.java:

package calcolatrice.buttons;

import java.awt.Color;

public class NumberButton extends GenericButton {
    public NumberButton(String text) {
        super(text);
        setBackground(new Color(200,200,200));
    }
}

Per quanto riguarda il file GenericButton.java:

package calcolatrice.buttons;

import javax.swing.JButton;

public class GenericButton extends JButton {
    public GenericButton(String text) {
        super(text);
        setOpaque(true);
        setBorderPainted(false);
    }
}