当我向现有的jpanel添加jpanel时出现问题!
我希望jlist位于中心位置,jbuttom位于南方位置!
我可以看到jlist,但jbuttom不会显示!
我正在使用Eclipse 3.0版本。
这是我的代码:
package classes;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.util.LinkedList;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JLabel;
import javax.swing.JList;
import javax.swing.JPanel;
import javax.swing.JTabbedPane;
public class JPanelDecorator extends JPanel implements ActionListener
{
private static final long serialVersionUID = 1L;
private JList<String> list = null;
private JButton Change=null;
public JPanelDecorator()
{
super();
setLayout(new BorderLayout());
setSize(450 ,400);
String animals_list[] = new String[AquaPanel.swims.size()];
LinkedList<Swimmable> ir = new LinkedList<Swimmable>(AquaPanel.swims);
for(int i=0;i<ir.size();i++)
{
animals_list[i]=(i+1+". "+ir.get(i).toString());
}
list = new JList<String>(animals_list );
list.setFont(new Font("Tahoma",Font.BOLD,15));
list.setSize(450, 300);
add(list,BorderLayout.CENTER);
Change = new JButton("Change Color");
Change.addActionListener(this);
add(Change,BorderLayout.CENTER);
repaint();
}
@Override
public void actionPerformed(ActionEvent e) {
}
}
请帮忙!
答案 0 :(得分:1)
你有一个微妙的错误。在JPanelDecorator
的构造函数中,您有:
public JPanelDecorator()
{
//....
add(list,BorderLayout.CENTER);
//...
add(Change,BorderLayout.CENTER); // center again...
//...
}
但你需要的是:
public JPanelDecorator()
{
//....
add(list,BorderLayout.CENTER);
//...
add(Change,BorderLayout.SOUTH); // south
//...
}