用Java设计一个简单的图形软件系统，常见的图形有三角形，长方形，圆(椭圆)等，它们的功能有计算面积、计算周长、填充颜色等，每种图形还可以有自己的功能。请设计出这个简单的图形系统。

这个简单的图形系统可以使用Java图形界面(GUI)库来实现，比如Swing或JavaFX。下面是一个简单的设计：

1. 创建一个抽象类Shape作为所有图形的基类，其中包含计算面积和周长的抽象方法，以及填充颜色的成员变量和方法。

public abstract class Shape {
    protected Color fillColor;
    
    public Shape(Color fillColor) {
        this.fillColor = fillColor;
    }
    
    public abstract double getArea();
    
    public abstract double getPerimeter();
    
    public void setFillColor(Color fillColor) {
        this.fillColor = fillColor;
    }
    
    public Color getFillColor() {
        return fillColor;
    }
}

2. 创建三角形、长方形和圆形这三个具体的图形类，它们都继承Shape类，并实现Shape类中的抽象方法。

public class Triangle extends Shape {
    private double a, b, c;
    
    public Triangle(Color fillColor, double a, double b, double c) {
        super(fillColor);
        this.a = a;
        this.b = b;
        this.c = c;
    }
    
    @Override
    public double getArea() {
        double p = (a + b + c) / 2;
        return Math.sqrt(p * (p - a) * (p - b) * (p - c));
    }
    
    @Override
    public double getPerimeter() {
        return a + b + c;
    }
    
    // Triangle-specific method
    public boolean isRightTriangle() {
        return a * a + b * b == c * c || b * b + c * c == a * a || c * c + a * a == b * b;
    }
}

public class Rectangle extends Shape {
    private double width, height;
    
    public Rectangle(Color fillColor, double width, double height) {
        super(fillColor);
        this.width = width;
        this.height = height;
    }
    
    @Override
    public double getArea() {
        return width * height;
    }
    
    @Override
    public double getPerimeter() {
        return 2 * (width + height);
    }
    
    // Rectangle-specific method
    public boolean isSquare() {
        return width == height;
    }
}

public class Circle extends Shape {
    private double radius;
    
    public Circle(Color fillColor, double radius) {
        super(fillColor);
        this.radius = radius;
    }
    
    @Override
    public double getArea() {
        return Math.PI * radius * radius;
    }
    
    @Override
    public double getPerimeter() {
        return 2 * Math.PI * radius;
    }
    
    // Circle-specific method
    public double getDiameter() {
        return 2 * radius;
    }
}

3. 创建一个GUI界面，用于用户输入各种图形的参数和填充颜色，并显示计算出的面积和周长。

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class ShapeGUI extends JFrame implements ActionListener {
    private JComboBox<String> shapeComboBox;
    private JTextField param1TextField, param2TextField, param3TextField;
    private JButton calculateButton;
    private JLabel areaLabel, perimeterLabel;
    private JPanel shapePanel;

    public ShapeGUI() {
        setTitle("Simple Shape Calculator");
        setSize(400, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel mainPanel = new JPanel();
        mainPanel.setLayout(new BorderLayout());

        JPanel inputPanel = new JPanel();
        inputPanel.setLayout(new GridLayout(4, 2));

        shapeComboBox = new JComboBox<String>(new String[]{"Triangle", "Rectangle", "Circle"});
        shapeComboBox.addActionListener(this);
        inputPanel.add(new JLabel("Shape:"));
        inputPanel.add(shapeComboBox);

        param1TextField = new JTextField();
        inputPanel.add(new JLabel("Param 1:"));
        inputPanel.add(param1TextField);

        param2TextField = new JTextField();
        inputPanel.add(new JLabel("Param 2:"));
        inputPanel.add(param2TextField);

        param3TextField = new JTextField();
        inputPanel.add(new JLabel("Param 3:"));
        inputPanel.add(param3TextField);

        mainPanel.add(inputPanel, BorderLayout.NORTH);

        shapePanel = new JPanel();
        shapePanel.setPreferredSize(new Dimension(300, 150));
        mainPanel.add(shapePanel, BorderLayout.CENTER);

        JPanel outputPanel = new JPanel();
        outputPanel.setLayout(new GridLayout(2, 2));
        outputPanel.add(new JLabel("Area:"));
        areaLabel = new JLabel("");
        outputPanel.add(areaLabel);
        outputPanel.add(new JLabel("Perimeter:"));
        perimeterLabel = new JLabel("");
        outputPanel.add(perimeterLabel);

        mainPanel.add(outputPanel, BorderLayout.SOUTH);

        calculateButton = new JButton("Calculate");
        calculateButton.addActionListener(this);
        mainPanel.add(calculateButton, BorderLayout.EAST);

        setContentPane(mainPanel);
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == shapeComboBox) {
            String shape = (String) shapeComboBox.getSelectedItem();
            if (shape.equals("Triangle")) {
                param1TextField.setText("");
                param2TextField.setText("");
                param3TextField.setText("");
                param1TextField.setEnabled(true);
                param2TextField.setEnabled(true);
                param3TextField.setEnabled(true);
            } else if (shape.equals("Rectangle")) {
                param1TextField.setText("");
                param2TextField.setText("");
                param3TextField.setText("");
                param1TextField.setEnabled(true);
                param2TextField.setEnabled(true);
                param3TextField.setEnabled(false);
            } else if (shape.equals("Circle")) {
                param1TextField.setText("");
                param2TextField.setText("");
                param3TextField.setText("");
                param1TextField.setEnabled(true);
                param2TextField.setEnabled(false);
                param3TextField.setEnabled(false);
            }
            shapePanel.removeAll();
            shapePanel.revalidate();
            shapePanel.repaint();
        } else if (e.getSource() == calculateButton) {
            String shape = (String) shapeComboBox.getSelectedItem();
            try {
                if (shape.equals("Triangle")) {
                    double a = Double.parseDouble(param1TextField.getText());
                    double b = Double.parseDouble(param2TextField.getText());
                    double c = Double.parseDouble(param3TextField.getText());
                    Triangle t = new Triangle(Color.WHITE, a, b, c);
                    shapePanel = new TrianglePanel(t);
                    areaLabel.setText(String.format("%.2f", t.getArea()));
                    perimeterLabel.setText(String.format("%.2f", t.getPerimeter()));
                } else if (shape.equals("Rectangle")) {
                    double width = Double.parseDouble(param1TextField.getText());
                    double height = Double.parseDouble(param2TextField.getText());
                    Rectangle r = new Rectangle(Color.WHITE, width, height);
                    shapePanel = new RectanglePanel(r);
                    areaLabel.setText(String.format("%.2f", r.getArea()));
                    perimeterLabel.setText(String.format("%.2f", r.getPerimeter()));
                } else if (shape.equals("Circle")) {
                    double radius = Double.parseDouble(param1TextField.getText());
                    Circle c = new Circle(Color.WHITE, radius);
                    shapePanel = new CirclePanel(c);
                    areaLabel.setText(String.format("%.2f", c.getArea()));
                    perimeterLabel.setText(String.format("%.2f", c.getPerimeter()));
                }
                shapePanel.setPreferredSize(new Dimension(300, 150));
                shapePanel.setBackground(Color.WHITE);
                mainPanel.add(shapePanel, BorderLayout.CENTER);
                mainPanel.revalidate();
                mainPanel.repaint();
            } catch (NumberFormatException ex) {
                JOptionPane.showMessageDialog(this, "Invalid input", "Error", JOptionPane.ERROR_MESSAGE);
            }
        }
    }

    public static void main(String[] args) {
        new ShapeGUI();
    }
}

class TrianglePanel extends JPanel {
    private Triangle triangle;

    public TrianglePanel(Triangle triangle) {
        this.triangle = triangle;
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        int[] xPoints = {10, 150, 290};
        int[] yPoints = {140, 10, 140};
        g.setColor(triangle.getFillColor());
        g.fillPolygon(xPoints, yPoints, 3);
        g.setColor(Color.BLACK);
        g.drawPolygon(xPoints, yPoints, 3);
    }
}

class RectanglePanel extends JPanel {
    private Rectangle rectangle;

    public RectanglePanel(Rectangle rectangle) {
        this.rectangle = rectangle;
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(rectangle.getFillColor());
        g.fillRect(10, 10, 280, 130);
        g.setColor(Color.BLACK);
        g.drawRect(10, 10, 280, 130);
    }
}

class CirclePanel extends JPanel {
    private Circle circle;

    public CirclePanel(Circle circle) {
        this.circle = circle;
    }

    @Override
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        g.setColor(circle.getFillColor());
        g.fillOval(10, 10, 280, 130);
        g.setColor(Color.BLACK);
        g.drawOval(10, 10, 280, 130);
    }
}

4. 运行程序，输入图形参数和填充颜色，点击计算按钮，图形和计算结果将会显示在GUI界面上。