java - 将按钮放在图像顶部？

Question

所以我正在努力让它发挥作用。尝试制作一个小型调整应用程序。我想将按钮放置在背景图像(该图像是吉他琴头)的适当调弦钉的顶部。但是我不知道如何使用流程布局来管理它。我可能只是愚蠢，但有人可以告诉我这里发生了什么吗？

package guitartuner;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.text.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;


public class GuitarTuner extends JFrame{

private JFrame mainFrame;
private JLabel EJLabel, AJLabel, DJLabel, GJLabel, BJLabel, eJLabel, guitarJLabel,
        bassJLabel, loopJLabel;
private JPanel controlPanel;
private JButton EButton, AButton, DButton, GButton, BButton, eButton;

public class LoadImageApp extends Component{
    BufferedImage img;

    public void paint(Graphics g){
        g.drawImage(img, 0, 0, null);
    }

    public LoadImageApp(){
        try{
            img = ImageIO.read(new File("/Users/Yojimbo/NetBeansProjects/guitarTuner/src/guitartuner/headstock.jpg"));
        } catch (IOException e){    
        }
    }
    public Dimension getPreferredSize() {
        if (img == null) {
            return new Dimension(500,500);
        } else {
            return new Dimension(img.getWidth(null), img.getHeight(null));
        }
    }
}

public GuitarTuner(){
    createUserInterface();
}

public void createUserInterface(){



    JFrame f = new JFrame("Guitar Tuner");

    f.addWindowListener(new WindowAdapter(){
        public void windowClosing(WindowEvent e){
            System.exit(0);
        }
    });

    f.add(new LoadImageApp());
    f.setLayout(new FlowLayout());

    EButton = new JButton();
    EButton.setBounds(0, 0, 50, 10);
    EButton.setText("E");
    f.add(EButton);

    AButton = new JButton();
    AButton.setBounds(40, 40, 50, 10);
    AButton.setText("A");
    f.add(AButton);

    DButton = new JButton();
    DButton.setBounds(60, 60, 50, 10);
    DButton.setText("D");
    f.add(DButton);

    GButton = new JButton();
    GButton.setBounds(20, 100, 50, 10);
    GButton.setText("G");
    f.add(GButton);

    BButton = new JButton();
    BButton.setBounds(40, 100, 50, 10);
    BButton.setText("B");
    f.add(BButton);

    eButton = new JButton();
    eButton.setBounds(60, 100, 50, 10);
    eButton.setText("e");
    f.add(eButton);

    f.pack();
    f.setTitle("Aaron's Awesome Guitar Tuner");
    f.setSize (400, 575);
    f.setVisible(true);
}

public static void main(String[] args) {
    GuitarTuner application = new GuitarTuner();
    application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}   
}

Answer 1

尝试使用GridBagLayout。花点时间阅读本文。这可能会对您有所帮助，尤其是当您想将按钮放在您想要的位置时。

https://docs.oracle.com/javase/tutorial/uiswing/layout/gridbag.html