Question

如何在单击按钮的帮助下更改图片。我创建了一个x变量，因为那时我可以创建不同的if语句，但这对我不起作用，可能是因为我做错了...这是我的代码到目前为止：

public class Main extends JFrame{

    private JButton changePic;
    private JPanel panel;
    private JLabel pic1;
    private JLabel pic2;
    private JLabel pic3;
    private JLabel picture;
    private int x = 0;

    public Main(){

        panel = new JPanel();
        add(panel);

        changePic = new JButton("Change Button");
        panel.add(changePic);


        pic1 = new JLabel(new ImageIcon("pic1.png"));
        pic2 = new JLabel(new ImageIcon("pic.png"));
        pic3 = new JLabel(new ImageIcon("pic3.png"));

        panel.add(pic1);
        panel.add(pic2);
        panel.add(pic3);

        changePic.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                if(e.getSource() == changePic){

                }
            }
        });
        getContentPane().setBackground(Color.white);
        setSize(300, 300);
        setVisible(true);
        setDefaultCloseOperation(EXIT_ON_CLOSE);

    }

    public static void main(String[] args){
        Main fr = new Main();
    }
}

Answer 1

<script href="<c:url value="/resources/js/app.js"/>"></script>

您不需要多个public class Main extends JFrame{ private JButton changePic; private JPanel panel; private JLabel pic1; private int x = 0; public Main(){ panel = new JPanel(); add(panel); changePic = new JButton("Change Button"); panel.add(changePic); pic1 = new JLabel(); panel.add(pic1); ImageIcon icon1 = new ImageIcon("pic1.gif"); ImageIcon icon2 = new ImageIcon("pic2.gif"); ImageIcon icon3 = new ImageIcon("pic3.gif"); changePic.addActionListener(new ActionListener(){ public void actionPerformed(ActionEvent e){ if(e.getSource() == changePic){ if(x == 0){ pic1.setIcon(icon1); }else if(x == 1){ pic1.setIcon(icon2); }else if(x == 2){ pic1.setIcon(icon3); } Main.this.pack(); x++; if(x > 2) x = 0; } } }); getContentPane().setBackground(Color.white); setSize(300, 300); setVisible(true); setDefaultCloseOperation(EXIT_ON_CLOSE); } public static void main(String[] args){ Main fr = new Main(); } }，而是使用3 JLabel。
每次进行UI更改时，您都需要致电ImageIcon JFrame 这种情况，改变图像）

如何使用JButton更改图像

1 个答案: