我正在尝试将图像添加到 JButton，但我不确定我缺少什么。当我运行以下代码时，按钮看起来与我创建它时没有任何图像属性完全相同。Background.jpeg 位于我的项目文件夹的根目录中。
this is the code:
package eg.edu.guc.dvonn.gui;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.GridLayout;
import java.awt.TextArea;
import java.awt.TextField;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import eg.edu.guc.dvonn.engine.Board;
public class FirstWindow extends JFrame implements ActionListener {
JButton Startbutton;
JPanel welcomePanel;
JPanel SecondPanel;
JPanel StandardPanel;
JPanel custPanel;
JPanel panelFill;
JButton Standard;
JButton fill;
JButton put;
JButton cust;
JLabel label;
TextField rows;
TextField col;
Board b;
JButton[][] button;
int r1;
int cc;
public FirstWindow(){
setSize(800,600);
setVisible(true);
setLayout(new BorderLayout());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
welcomePanel = new JPanel();
label = new JLabel("Welcome to Dvonn");
welcomePanel.add(label);
welcomePanel.setVisible(true);
label.setForeground(Color.RED);
label.setFont(new Font("Serif", Font.PLAIN, 40));
Startbutton = new JButton ("start");
Startbutton.setBackground(Color.BLACK);
Startbutton.setForeground(Color.RED);
Startbutton.setPreferredSize(new Dimension(120,40));
welcomePanel.add(Startbutton);
add(welcomePanel);
Startbutton.addActionListener(this);
SecondPanel = new JPanel();
SecondPanel.setVisible(false);
SecondPanel.setSize(400,400);
rows = new TextField();
col= new TextField();
SecondPanel.add(rows);
SecondPanel.add(col);
fill = new JButton("fill random");
fill.addActionListener(this);
fill.setBackground(Color.LIGHT_GRAY);
fill.setForeground(Color.BLUE);
put = new JButton("put");
put.setBackground(Color.LIGHT_GRAY);
put.setForeground(Color.BLUE);
Standard = new JButton("Standardised board");
Standard.setBackground(Color.LIGHT_GRAY);
Standard.setForeground(Color.BLUE);
Standard.addActionListener(this);
cust = new JButton("customized");
cust.setBackground(Color.LIGHT_GRAY);
cust.setForeground(Color.BLUE);
cust.addActionListener(this);
panelFill = new JPanel();
panelFill.add(fill);
panelFill.add(put);
SecondPanel.add(Standard);
SecondPanel.add(cust);
b = new Board(r1,cc);
this.r1 =5;
this.cc = 11;
button = new JButton [r1][cc];
StandardPanel = new JPanel();
StandardPanel.setBackground(Color.WHITE);
StandardPanel.setLayout(new GridLayout(r1, cc));
for (int i = 0; i <= r1 - 1; i++) {
for (int j = 0; j <= cc - 1; j++) {
button[i][j] = new JButton(); // i want to add an image to it
button[i][j].addActionListener(this);
}
}
for (int i = 0; i <= r1 - 1; i++) {
for (int j = 0; j <= cc - 1; j++) {
button[i][j].setLayout(new FlowLayout());
button[i][j].setBackground(Color.WHITE);
StandardPanel.add(button[i][j], i, j);
}
}
}
public FirstWindow(int row,int cols){
setSize(800,600);
setVisible(true);
setLayout(new BorderLayout());
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
fill = new JButton("fill random");
fill.addActionListener(this);
fill.setBackground(Color.LIGHT_GRAY);
fill.setForeground(Color.BLUE);
put = new JButton("put");
put.setBackground(Color.LIGHT_GRAY);
put.setForeground(Color.BLUE);
Standard = new JButton("Standardised board");
Standard.setBackground(Color.LIGHT_GRAY);
Standard.setForeground(Color.BLUE);
Standard.addActionListener(this);
cust = new JButton("customized");
cust.setBackground(Color.LIGHT_GRAY);
cust.setForeground(Color.BLUE);
cust.addActionListener(this);
panelFill = new JPanel();
panelFill.add(fill);
panelFill.add(put);
this.r1 = row;
this.cc = cols;
b = new Board(r1,cc);
button = new JButton [r1][cc];
custPanel = new JPanel();
custPanel.setBackground(Color.WHITE);
custPanel.setLayout(new GridLayout(r1, cc));
for (int i = 0; i <= r1 - 1; i++) {
for (int j = 0; j <= cc - 1; j++) {
button[i][j] = new JButton(); // i want to add an image to it
button[i][j].addActionListener(this);
}
}
for (int i = 0; i <= r1 - 1; i++) {
for (int j = 0; j <= cc - 1; j++) {
button[i][j].setLayout(new FlowLayout());
button[i][j].setBackground(Color.WHITE);
custPanel.add(button[i][j], i, j);
}
}
add(custPanel);
add(panelFill,BorderLayout.SOUTH);
}
public static void main (String [] args){
FirstWindow window = new FirstWindow();
}
@Override
public void actionPerformed(ActionEvent e) {
if (e.getSource()==Startbutton){
this.remove(welcomePanel);
this.add(SecondPanel);
SecondPanel.setVisible(true);
//this.add(SecondPanel);
JLabel label1 = new JLabel("dvonn");
label1.setForeground(Color.RED);
label1.setFont(new Font("Serif", Font.PLAIN, 25));
SecondPanel.add(label1);
}
if(e.getSource()== cust){
String rowText = rows.getText();
String colText = col.getText();
r1 = Integer.parseInt(rowText);
cc = Integer.parseInt(colText);
this.setVisible(false);
FirstWindow custom =new FirstWindow(r1, cc);
}
if(e.getSource()==Standard){
SecondPanel.setVisible(false); // set the second panel invisible
this.add(StandardPanel); //to add the panel with the buttons
StandardPanel.setVisible(true);
add(panelFill,BorderLayout.SOUTH);
add(StandardPanel,BorderLayout.CENTER);
}
/* Board b = new Board(r1,c1);
b.fillRandom();*/
// }
}
}