我想将一个 JList 中的动作侦听器添加到另一个 JList，并且 JList 如何在没有任何文本的情况下出现? [英] I want to add an action listener from one JList to another JList and how can a JList appear with out any text inside?
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问题描述
我需要有关 Javan Swing 的 htis 问题的帮助.我的 GUI 中有三个 JList.其中一个列表包含餐厅的菜单.收银员应该点击第一个 JList 上的一道菜，他点击的任何内容都应该出现在第二个 JList 上.我怎样才能做到这一点?
还有一个问题是，我不能让 JList 出现，除非我给它一个数组对象来显示菜单，我希望 JList 在它也为空时出现，我该怎么做?
<预><代码>导入 java.awt.*;导入 java.awt.event.*;导入 javax.swing.*;公共类框架扩展 JFrame {私有 JList 菜单列表；私人 JList 订单列表；私人 JLabel countLabel;私有 DefaultListModel listModel;私有维度菜单ListDimension;公共框架(){JFrame frame = new JFrame();frame.setDefaultCloseOperation(DISPOSE_ON_CLOSE);构建UI();}私有无效buildUI(){BoxLayout mainLayout = new BoxLayout(getContentPane(), BoxLayout.X_AXIS);getContentPane().setLayout(mainLayout);getContentPane().add(Box.createHorizontalGlue());getContentPane().add(buildMenuPanel());getContentPane().add(Box.createHorizontalStrut(0));getContentPane().add(buildOrderPanel());getContentPane().add(Box.createHorizontalStrut(10));getContentPane().add(buildPayPanel());getContentPane().add(Box.createHorizontalStrut(50));//getContentPane().add(recieptPanel());getContentPane().add(Box.createHorizontalGlue());}私人 JPanel buildMenuPanel (){JPanel menuPanel = new JPanel();BoxLayout menuLayout = new BoxLayout(menuPanel, BoxLayout.Y_AXIS);menuPanel.setLayout(menuLayout);getContentPane().add(menuPanel);//menuList.addActionListener(//新的ActionListener(){//public void actionPerformed(ActionEvent e)//{//helloPressed();//}//}listModel = new DefaultListModel();listModel.addElement("ghjghj");listModel.addElement("约翰史密斯");listModel.addElement("Kathy Green");listModel.addElement("ghjghj");listModel.addElement("约翰史密斯");listModel.addElement("Kathy Green");listModel.addElement("ghjghj");listModel.addElement("约翰史密斯");listModel.addElement("Kathy Green");listModel.addElement("ghjghj");listModel.addElement("约翰史密斯");listModel.addElement("Kathy Green");menuList = new JList(listModel);//数据类型为Object[]menuList.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);menuList.setLayoutOrientation(JList.VERTICAL);menuList.setVisibleRowCount(-1);menuList.setFixedCellWidth(200);JScrollPane listScroller = new JScrollPane(menuList);listScroller.setPreferredSize(new Dimension(7, 250));menuPanel.add(menuList);menuPanel.add(Box.createVerticalStrut(5));返回菜单面板；}}私人 JPanel buildOrderPanel(){JPanel orderPanel = new JPanel();BoxLayout orderLayout = new BoxLayout(orderPanel, BoxLayout.Y_AXIS);orderPanel.setLayout(orderLayout);getContentPane().add(orderPanel);//menuList.addActionListener(//新的ActionListener()//{//public void actionPerformed(ActionEvent e)//{//helloPressed();//}orderList = new JList(listModel);//数据类型为Object[]orderList.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);orderList.setLayoutOrientation(JList.HORIZONTAL_WRAP);orderList.setVisibleRowCount(-1);orderList.setFixedCellWidth(200);JScrollPane listScroller = new JScrollPane(orderList);listScroller.setPreferredSize(new Dimension(250, 80));//orderList.setVisible(true);orderPanel.add(orderList);//orderPanel.setVisible(true);orderPanel.add(Box.createVerticalStrut(5));退货订单面板；}私人 JPanel buildPayPanel(){JPanel payPanel = new JPanel();BoxLayout doneLayout = new BoxLayout(payPanel, BoxLayout.Y_AXIS);payPanel.setLayout(doneLayout);getContentPane().add(payPanel);payPanel.add(Box.createVerticalStrut(5));listModel = new DefaultListModel();listModel.addElement("ghjghj");listModel.addElement("约翰史密斯");listModel.addElement("Kathy Green");listModel.addElement("ghjghj");listModel.addElement("约翰史密斯");listModel.addElement("Kathy Green");listModel.addElement("ghjghj");listModel.addElement("约翰史密斯");listModel.addElement("Kathy Green");listModel.addElement("ghjghj");listModel.addElement("约翰史密斯");listModel.addElement("Kathy Green");menuListDimension = 新维度 (10,10);menuList = new JList(listModel);//数据类型为Object[]menuList.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);menuList.setLayoutOrientation(JList.VERTICAL);menuList.setVisibleRowCount(50);menuList.setFixedCellWidth(300);menuList.setDragEnabled(true);menuList.setMinimumSize(menuListDimension);JScrollPane listScroller = new JScrollPane(menuList);listScroller.setPreferredSize(new Dimension(80, 250));payPanel.add(menuList);payPanel.add(Box.createVerticalStrut(5));getContentPane().add(payPanel);JButton payButton = new JButton("Pay");JButton cancelButton = new JButton("取消");//menuList.addActionListener(//新的ActionListener()//{//public void actionPerformed(ActionEvent e)//{//helloPressed();//}payPanel.add(payButton);payPanel.add(cancelButton);返回payPanel；}} 解决方案
Empty
JList : JList l = new JList();添加列表选择监听器
firstJList.addSelectionListener(new ListSelectionListener() {public void valueChanged(ListSelectionEvent e){//将项目添加到您的其他JList} });
I need help with htis issue I have with Javan swing. I have three JLists in my GUI. One of the list contains a menu for a restaurant. The cashier is supposed to click on the a dish on the first JList and whatever he clicked should appear on the second JList. How can i do this?
Also another problem is that I cant hae the JList appear UNLESS i am giving it an array object to display the menu, I want the JList to appear while its empty as well, how can i do that?
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class frame extends JFrame {
private JList menuList ;
private JList orderList;
private JLabel countLabel;
private DefaultListModel listModel;
private Dimension menuListDimension;
public frame (){
JFrame frame = new JFrame ();
frame.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
buildUI();
}
private void buildUI () {
BoxLayout mainLayout = new BoxLayout(getContentPane(), BoxLayout.X_AXIS);
getContentPane().setLayout(mainLayout);
getContentPane().add(Box.createHorizontalGlue());
getContentPane().add(buildMenuPanel());
getContentPane().add(Box.createHorizontalStrut(0));
getContentPane().add(buildOrderPanel());
getContentPane().add(Box.createHorizontalStrut(10));
getContentPane().add(buildPayPanel());
getContentPane().add(Box.createHorizontalStrut(50));
//getContentPane().add(recieptPanel());
getContentPane().add(Box.createHorizontalGlue());
}
private JPanel buildMenuPanel (){
JPanel menuPanel = new JPanel();
BoxLayout menuLayout = new BoxLayout(menuPanel, BoxLayout.Y_AXIS);
menuPanel.setLayout(menuLayout);
getContentPane().add(menuPanel);
//menuList.addActionListener(
//new ActionListener()
{
//public void actionPerformed(ActionEvent e)
//{
//helloPressed();
//}
//}
listModel = new DefaultListModel();
listModel.addElement("ghjghj");
listModel.addElement("John Smith");
listModel.addElement("Kathy Green");
listModel.addElement("ghjghj");
listModel.addElement("John Smith");
listModel.addElement("Kathy Green");
listModel.addElement("ghjghj");
listModel.addElement("John Smith");
listModel.addElement("Kathy Green");
listModel.addElement("ghjghj");
listModel.addElement("John Smith");
listModel.addElement("Kathy Green");
menuList = new JList(listModel); //data has type Object[]
menuList.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
menuList.setLayoutOrientation(JList.VERTICAL);
menuList.setVisibleRowCount(-1);
menuList.setFixedCellWidth(200);
JScrollPane listScroller = new JScrollPane(menuList);
listScroller.setPreferredSize(new Dimension(7, 250));
menuPanel.add(menuList);
menuPanel.add(Box.createVerticalStrut(5));
return menuPanel;
}
}
private JPanel buildOrderPanel (){
JPanel orderPanel = new JPanel();
BoxLayout orderLayout = new BoxLayout(orderPanel, BoxLayout.Y_AXIS);
orderPanel.setLayout(orderLayout);
getContentPane().add(orderPanel);
//menuList.addActionListener(
//new ActionListener()
//{
//public void actionPerformed(ActionEvent e)
//{
//helloPressed();
//}
orderList = new JList(listModel); //data has type Object[]
orderList.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
orderList.setLayoutOrientation(JList.HORIZONTAL_WRAP);
orderList.setVisibleRowCount(-1);
orderList.setFixedCellWidth(200);
JScrollPane listScroller = new JScrollPane(orderList);
listScroller.setPreferredSize(new Dimension(250, 80));
//orderList.setVisible(true);
orderPanel.add(orderList);
//orderPanel.setVisible(true);
orderPanel.add(Box.createVerticalStrut(5));
return orderPanel;
}
private JPanel buildPayPanel (){
JPanel payPanel = new JPanel();
BoxLayout doneLayout = new BoxLayout(payPanel, BoxLayout.Y_AXIS);
payPanel.setLayout(doneLayout);
getContentPane().add(payPanel);
payPanel.add(Box.createVerticalStrut(5));
listModel = new DefaultListModel();
listModel.addElement("ghjghj");
listModel.addElement("John Smith");
listModel.addElement("Kathy Green");
listModel.addElement("ghjghj");
listModel.addElement("John Smith");
listModel.addElement("Kathy Green");
listModel.addElement("ghjghj");
listModel.addElement("John Smith");
listModel.addElement("Kathy Green");
listModel.addElement("ghjghj");
listModel.addElement("John Smith");
listModel.addElement("Kathy Green");
menuListDimension = new Dimension (10,10);
menuList = new JList(listModel); //data has type Object[]
menuList.setSelectionMode(ListSelectionModel.SINGLE_INTERVAL_SELECTION);
menuList.setLayoutOrientation(JList.VERTICAL);
menuList.setVisibleRowCount(50);
menuList.setFixedCellWidth(300);
menuList.setDragEnabled(true);
menuList.setMinimumSize(menuListDimension);
JScrollPane listScroller = new JScrollPane(menuList);
listScroller.setPreferredSize(new Dimension(80, 250));
payPanel.add(menuList);
payPanel.add(Box.createVerticalStrut(5));
getContentPane().add(payPanel);
JButton payButton = new JButton ("Pay");
JButton cancelButton = new JButton ("Cancel");
//menuList.addActionListener(
//new ActionListener()
//{
//public void actionPerformed(ActionEvent e)
//{
//helloPressed();
//}
payPanel.add(payButton);
payPanel.add(cancelButton);
return payPanel;
}
}
解决方案
Empty
JList : JList l = new JList();Add a list selection Listener
firstJList.addSelectionListener(new ListSelectionListener() { public void valueChanged(ListSelectionEvent e) { //add items to your other JList } });
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