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Java JList not appearing

开发者 https://www.devze.com 2023-01-07 12:08 出处:网络
On every JList I\'ve made... I\'ve had to CLICK on it before ANY of the JList would show up. It was like... invisible but still there... UNTIL I clicked on it...

On every JList I've made... I've had to CLICK on it before ANY of the JList would show up. It was like... invisible but still there... UNTIL I clicked on it...

I have tried list.setVisible(true) and such... but no luck. :\ Help? Yes, I tried the Javadoc, Google, AND SO Search. >_< I have never encountered a problem like this.

Code:

import java.applet.Applet;
import java.awt.*;
import javax.swing.*;
import javax.swing.JList;
import java.awt.event.*;
import java.util.ArrayList;
import java.io.*;
import java.util.*;

public class inventory extends JApplet implements MouseListener {

public static String newline;
public static JList list;
int gold = 123;

    public void init() {



ArrayList<String> arr = new ArrayList<String>();
arr.add("Hatchet");
arr.add("Sword");
arr.add("Shield");
arr.add(gold + " Gold");
System.out.println("You have " + arr.size() + " items in your inventory.");
showInventory(arr);



        list = new JList(arr.toArray());

        add(list);

        list.addMouseListener(this);

        list.setVisible(true);

    }

public static void showInventory (ArrayList<String> theList) {
for (int i = 0; i < theList.size(); i++) 开发者_如何学运维{
System.out.println(theList.get(i));
}
}


    public void mousePressed(MouseEvent e) { }

    public void mouseReleased(MouseEvent e) {
        Object index = list.getSelectedValue();
       System.out.println("You have selected: " + index);
    }

    public void mouseEntered(MouseEvent e) { }

    public void mouseExited(MouseEvent e) { }

    public void mouseClicked(MouseEvent e) { }




    public void paint(Graphics g) {

    }
}


Or if you want to override the paint method, replace it with:

public void paint(Graphics g) {
   super.paint(g);
   // your code
}


You have to erase this part from your code:

public void paint(Graphics g) {

}

Basicly your problem was that you were overwriting the paint method with an empty method. That is why your list was not displaying properly at start.


You can add this.setVisible(true); line at the end of the init() method like

list.addMouseListener(this);

list.setVisible(true);
this.setVisible(true);
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