我正在尝试添加 JFrame 背景图像，但在 Java 中没有显示出来。

huangapple
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英文:

I am trying to add JFrame background image but it is not is not showing up in java

问题

public class Triangle {
    Oval o;

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

    public Triangle() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.setSize(400, 400);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {
        private Polygon poly;

        {
            BufferedImage img = null;
            try {
                img = ImageIO.read(new File("apple.PNG"));
            } catch (IOException e) {
                e.printStackTrace();
            }
            Image dimg = img.getScaledInstance(800, 508, Image.SCALE_SMOOTH);
            ImageIcon imageIcon = new ImageIcon(dimg);
            setContentPane(new JLabel(imageIcon));

            poly = new Polygon(
                    new int[] { 110, 150, 50 },
                    new int[] { 200, 0, 0 },
                    3);
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(400, 400);
        }

        private void setContentPane(JLabel jLabel) {
            // Set content pane with the background image
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            Graphics2D g2 = (Graphics2D) g;
            g2.setColor(Color.blue);
            g2.fill(poly);
            g2.setColor(Color.red);
            g2.fillRect(0, 0, 25, 75);
            g2.setColor(Color.green);
            g2.fillOval(200, 100, 100, 50);
            g2.setColor(Color.green);
            g2.fillOval(300, 300, 250, 250);
        }
    }
}
英文:

I am trying to add a background image to an JFrame.

I tried every possible solution but it's not working, all I want to do is to add a background image to the JFrame and then print shapes in it as you can see in my code.

Can anyone help me to fix it?

public class Triangle {
	Oval o;

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

	public Triangle() {
		EventQueue.invokeLater(new Runnable() {
			@Override
			public void run() {
				try {
					UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
				} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
				}

				JFrame frame = new JFrame("Testing");
				frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
				frame.setLayout(new BorderLayout());
				frame.add(new TestPane());
				frame.setSize(400, 400);
				frame.pack();
				frame.setLocationRelativeTo(null);
				frame.setVisible(true);
			}
		});
	}

	public class TestPane extends JPanel {
		private Polygon poly;

		{
			BufferedImage img = null;
			try {
				img = ImageIO.read(new File("apple.PNG"));
			} catch (IOException e) {
				e.printStackTrace();
			}
			Image dimg = img.getScaledInstance(800, 508, Image.SCALE_SMOOTH);
			ImageIcon imageIcon = new ImageIcon(dimg);
			setContentPane(new JLabel(imageIcon));

			poly = new Polygon(
					new int[] { 110, 150, 50 },
					new int[] { 200, 0, 0 },
					3);
		}

		@Override
		public Dimension getPreferredSize() {
			return new Dimension(400, 400);
		}

		private void setContentPane(JLabel jLabel) {
		}

		@Override
		protected void paintComponent(Graphics g) {
			super.paintComponent(g);
			Graphics2D g2 = (Graphics2D) g;
			g2.setColor(Color.blue);
			g2.fill(poly);
			g2.setColor(Color.red);
			g2.fillRect(0, 0, 25, 75);
			g2.setColor(Color.green);
			g2.fillOval(200, 100, 100, 50);
			g2.setColor(Color.green);
			g2.fillOval(300, 300, 250, 250);
		}
	}
}

答案1

得分: 1

请尝试这个。对我来说很好。

package model;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Polygon;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;

public class Triangle {

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

    public Triangle() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (Exception ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.setSize(400, 400);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {
        private Polygon poly;

        {
            poly = new Polygon(
                    new int[]{110, 150, 50},
                    new int[]{200, 0, 0},
                    3);
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(400, 400);
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            try {
                BufferedImage img = ImageIO.read(new File("apple.PNG"));
                Image dimg = img.getScaledInstance(800, 508, Image.SCALE_SMOOTH);
                g.drawImage(dimg, 0, 0, this.getWidth(), this.getHeight(), null);
            } catch (IOException e) {
                e.printStackTrace();
            }

            Graphics2D g2 = (Graphics2D) g;
            g2.setColor(Color.blue);
            g2.fill(poly);
            g2.setColor(Color.red);
            g2.fillRect(0, 0, 25, 75);
            g2.setColor(Color.green);
            g2.fillOval(200, 100, 100, 50);
            g2.setColor(Color.green);
            g2.fillOval(300, 300, 250, 250);
        }
    }
}
英文:

Try this. It's fine for me.

package model;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Polygon;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;

public class Triangle {

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

    public Triangle() {
        EventQueue.invokeLater(new Runnable() {
            @Override
            public void run() {
                try {
                    UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                } catch (Exception ex) {
                }

                JFrame frame = new JFrame("Testing");
                frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                frame.setLayout(new BorderLayout());
                frame.add(new TestPane());
                frame.setSize(400, 400);
                frame.pack();
                frame.setLocationRelativeTo(null);
                frame.setVisible(true);
            }
        });
    }

    public class TestPane extends JPanel {
        private Polygon poly;

        {
            poly = new Polygon(
                    new int[]{110, 150, 50},
                    new int[]{200, 0, 0},
                    3);
        }

        @Override
        public Dimension getPreferredSize() {
            return new Dimension(400, 400);
        }

        @Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
            try {
                BufferedImage img = ImageIO.read(new File("apple.PNG"));
                Image dimg = img.getScaledInstance(800, 508, Image.SCALE_SMOOTH);
                g.drawImage(dimg, 0, 0, this.getWidth(), this.getHeight(), null);
            } catch (IOException e) {
                e.printStackTrace();
            }

            Graphics2D g2 = (Graphics2D) g;
            g2.setColor(Color.blue);
            g2.fill(poly);
            g2.setColor(Color.red);
            g2.fillRect(0, 0, 25, 75);
            g2.setColor(Color.green);
            g2.fillOval(200, 100, 100, 50);
            g2.setColor(Color.green);
            g2.fillOval(300, 300, 250, 250);
        }
    }
}

huangapple
  • 本文由 发表于 2020年5月29日 15:44:36
  • 转载请务必保留本文链接：https://java.coder-hub.com/62081042.html
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