java - 同じクラスファイルでメインメソッドからペイントに文字列を渡す

Question

私は最近Javaプログラミングを学び始め、いくつかのグラフィックスを始めました。グラフィック用の GUI を作成中ですが、JOptionPane.showInputDialog を使用して配列から選択した形状を渡す際に問題が発生しています。描画したい 2D 形状ごとにメソッドを作成し、別のクラス ファイルにペイント メソッドを配置してオーバーロードすることをお勧めしますか? 助けてください。私のコードを以下に示します。

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.GridLayout;
import java.awt.Rectangle;
import java.awt.geom.Ellipse2D;
import java.awt.geom.Line2D;

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

public class test extends JFrame {

    String x1; // starting x co-ordinate
    String y1; // starting y co-ordinate
    String r1; // radius for circle
    String l1; // length for shape
    String h1; // height for shape
    String draw;

    int x = 0;
    int y = 0;
    int l = 0;
    int h = 0;
    int r = 0;

    /**
     * Launch the application.
     */
    public static void main(String[] args) {

        EventQueue.invokeLater(new Runnable() {
            public void run() {
                try {
                    test frame = new test();
                    JPanel panel = new JPanel() {
                        @Override
                        public Dimension getPreferredSize() {
                            return new Dimension(2000, 2000);
                        }
                    };
                    // frame.getContentPane().add(new JScrollPane(panel),
                    // BorderLayout.CENTER);
                    frame.setVisible(true);
                    frame.setSize(1200, 600);

                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        });
    }

    /**
     * Create the frame.
     */
    public test() {

        String[] shapes = { "Circle", "Ellipse", "Line", "Rectangle" };

        String drawShape = (String) JOptionPane.showInputDialog(null,
                "Select a shape to be drawn: ", "Drawing 2D Shapes",
                JOptionPane.QUESTION_MESSAGE, null, shapes, shapes[0]);

        if (drawShape == "Circle") {
            System.out.println("Shape selected is: " + drawShape);

            x1 = JOptionPane.showInputDialog(null,
                    "Input center (x value): ");
            y1 = JOptionPane.showInputDialog(null,
                    "Input center (y value): ");
            r1 = JOptionPane.showInputDialog(null, "Input radius: ");

            // parsing the variables from String to Integer
            x = Integer.parseInt(x1);
            y = Integer.parseInt(y1);
            r = Integer.parseInt(r1);
        }

        if (drawShape == "Ellipse") {
            System.out.println("Shape selected is: " + drawShape);

            x1 = JOptionPane.showInputDialog(null,
                    "Input x starting point: ");
            y1 = JOptionPane.showInputDialog(null,
                    "Input y starting point: ");
            l1 = JOptionPane.showInputDialog(null, "Please enter Width: ");
            h1 = JOptionPane
                    .showInputDialog(null, "Please enter Height: ");

            // parsing the variables from String to Integer
            x = Integer.parseInt(x1);
            y = Integer.parseInt(y1);
            l = Integer.parseInt(l1);
            h = Integer.parseInt(h1);
        }

        if (drawShape == "Line") {
            System.out.println("Shape selected is: " + drawShape);

            x1 = JOptionPane.showInputDialog(null, "Input point 1: ");
            y1 = JOptionPane.showInputDialog(null, "Input point 2: ");
            l1 = JOptionPane.showInputDialog(null, "Input point 3: ");
            h1 = JOptionPane.showInputDialog(null, "Input point 4: ");

            // parsing the variables from String to Integer
            x = Integer.parseInt(x1);
            y = Integer.parseInt(y1);
            l = Integer.parseInt(l1);
            h = Integer.parseInt(h1);
        }

        if (drawShape == "Rectangle") {
            x1 = JOptionPane.showInputDialog(null,
                    "Input x starting point: ");
            y1 = JOptionPane.showInputDialog(null,
                    "Input y starting point: ");
            l1 = JOptionPane.showInputDialog(null, "Please enter Width: ");
            h1 = JOptionPane
                    .showInputDialog(null, "Please enter Height: ");

            // parsing the variables from String to Integer
            x = Integer.parseInt(x1);
            y = Integer.parseInt(y1);
            l = Integer.parseInt(l1);
            h = Integer.parseInt(h1);
        }

    }

    public void paint(Graphics g) {
        super.paint(g);

        // drawing the shape
        Graphics2D g2 = (Graphics2D) g;

        Rectangle r = new Rectangle(x, y, l, h);
        g2.draw(r);


        /*
         * Ellipse2D.Double circle = new Ellipse2D.Double(x, y, r, r);
         * g2.draw(circle); g2.drawString("This is a Circle", (x + (r / 2)), y);
         * 
         * g2.setColor(new Color(0, 0, 255));
         * System.out.println("Shape selected is: " + type);
         * 
         * Ellipse2D.Double ellipse = new Ellipse2D.Double(x, y, l, h); //
         * defining // the // object // graphically g2.draw(ellipse);
         * g2.drawString("This is a ellipse", x, y);
         * 
         * g2.setColor(new Color(0, 0, 255));
         * System.out.println("Shape selected is: " + type);
         * 
         * Line2D.Double line1 = new Line2D.Double(x, y, l, h); g2.draw(line1);
         * g2.drawString("Point 1", x, y); g2.drawString("Point 2", l, h);
         */

    }

}