java - 如何设置图片的相对路径？

Question

如何设置图像的相对路径？

public class Currency2 extends JFrame implements ActionListener{
    private JButton USA_btn, INDIA_btn, DUBAI_btn, AUSTRALIA_btn, ITALY_btn, MALAYSIA_btn, SINGAPORE_btn, ENGLAND_btn, SAUDI_btn, QATAR_btn;
    public Currency2 cr2;
    ImagePanel panel_secondframe;
    Border thickBorder;
    public Currency2(){
        super("Currency Converter");
        this.InitializeComponents();
    }
    @Override
    public void actionPerformed(ActionEvent e) {
        String Object = e.getActionCommand();
        if(Object.equals("USA")){
            Currency_USA cus = new Currency_USA(this);
            cus.setVisible(true);
            this.setVisible(false);
        }
        else if(Object.equals("INDIA")){
            Currency_INDIA cin = new Currency_INDIA(this);
            cin.setVisible(true);
            this.setVisible(false);
        }
        else if(Object.equals("DUBAI")){
            Currency_DUBAI cdu = new Currency_DUBAI(this);
            cdu.setVisible(true);
            this.setVisible(false);
        }
        else if(Object.equals("ITALY")){
           Currency_ITALY cit = new Currency_ITALY(this);
           cit.setVisible(true);
           this.setVisible(false);
        }
        else if(Object.equals("ENGLAND")){
           Currency_ENGLAND cei = new Currency_ENGLAND(this);
           cei.setVisible(true);
           this.setVisible(false);
        }
        else if(Object.equals("AUSTRALIA")){
            Currency_AUSTRALIA cau = new Currency_AUSTRALIA(this);
            cau.setVisible(true);
            this.setVisible(false);
        }
        else if(Object.equals("MALAYSIA")){
           Currency_MALAYSIA cma = new Currency_MALAYSIA(this);
           cma.setVisible(true);
           this.setVisible(false);
        }
        else if(Object.equals("SINGAPORE")){
           Currency_SINGAPORE csi = new Currency_SINGAPORE(this);
           csi.setVisible(true);
           this.setVisible(false);
        }
        else if(Object.equals("SAUDI")){
           Currency_SAUDI cssi = new Currency_SAUDI(this);
           cssi.setVisible(true);
           this.setVisible(false);
        }
        else if(Object.equals("QATAR")){
           Currency_QATAR cqa = new Currency_QATAR(this);
           cqa.setVisible(true);
           this.setVisible(false);
        }
    }
private void InitializeComponents() {
    this.panel_secondframe = new ImagePanel(new ImageIcon("E:\\programing \\JAVA\\new netbean pro\\currency\\src\\newpackage\\image of currency converter\\secondframe.png").getImage());
    this.getContentPane().add(panel_secondframe);
    this.pack();

    this.thickBorder = new LineBorder(Color.black);

    this.USA_btn = new JButton("USA");
    this.USA_btn.setBounds(136, 35, 89, 23);
    this.USA_btn.addActionListener(this);
    this.USA_btn.setBorder(thickBorder);
    this.panel_secondframe.add(USA_btn);

    this.INDIA_btn = new JButton("INDIA");
    this.INDIA_btn.setBounds(136, 65, 89, 23);
    this.INDIA_btn.addActionListener(this);
    this.INDIA_btn.setBorder(thickBorder);
    this.panel_secondframe.add(INDIA_btn);

    this.DUBAI_btn = new JButton("DUBAI");
    this.DUBAI_btn.setBounds(136, 95, 89, 23);
    this.DUBAI_btn.addActionListener(this);
    this.DUBAI_btn.setBorder(thickBorder);
    this.panel_secondframe.add(DUBAI_btn);

    this.ITALY_btn = new JButton("ITALY");
    this.ITALY_btn.setBounds(136, 125, 89, 23);
    this.ITALY_btn.addActionListener(this);
    this.ITALY_btn.setBorder(thickBorder);
    this.panel_secondframe.add(ITALY_btn);

    this.SAUDI_btn = new JButton("SAUDI");
    this.SAUDI_btn.setBounds(136, 155, 89, 23);
    this.SAUDI_btn.addActionListener(this);
    this.SAUDI_btn.setBorder(thickBorder);
    this.panel_secondframe.add(SAUDI_btn);

    this.QATAR_btn = new JButton("QATAR");
    this.QATAR_btn.setBounds(136, 185, 89, 23);
    this.QATAR_btn.addActionListener(this);
    this.QATAR_btn.setBorder(thickBorder);
    this.panel_secondframe.add(QATAR_btn);

    this.ENGLAND_btn = new JButton("ENGLAND");
    this.ENGLAND_btn.setBounds(129, 215, 102, 23);
    this.ENGLAND_btn.addActionListener(this);
    this.ENGLAND_btn.setBorder(thickBorder);
    this.panel_secondframe.add(ENGLAND_btn);

    this.AUSTRALIA_btn = new JButton("AUSTRALIA");
    this.AUSTRALIA_btn.setBounds(129, 245, 102, 23);
    this.AUSTRALIA_btn.addActionListener(this);
    this.AUSTRALIA_btn.setBorder(thickBorder);
    this.panel_secondframe.add(AUSTRALIA_btn);

    this.MALAYSIA_btn = new JButton("MALAYSIA");
    this.MALAYSIA_btn.setBounds(129, 275, 102, 23);
    this.MALAYSIA_btn.addActionListener(this);
    this.MALAYSIA_btn.setBorder(thickBorder);
    this.panel_secondframe.add(MALAYSIA_btn);

    this.SINGAPORE_btn = new JButton("SINGAPORE");
    this.SINGAPORE_btn.setBounds(129, 305, 102, 23);
    this.SINGAPORE_btn.addActionListener(this);
    this.SINGAPORE_btn.setBorder(thickBorder);
    this.panel_secondframe.add(SINGAPORE_btn);

    this.add(this.panel_secondframe);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
}

Answer 1

要设置相对路径，请替换为，

this.panel_secondframe = new ImagePanel(new ImageIcon(".\\src\\newpackage\\image of currency converter\\secondframe.png").getImage());