【发布时间】：2015-07-12 16:54:17
【问题描述】：
我一直在这里进行研究，并一直在寻找解决问题的方法。我是java新手，所以我不知道所有的语法。我试图让我的代码使用 jlist 之间的按钮将项目从一个 jlist 传输到另一个 jlist。左边的列表有开始的项目。该代码假设使用添加按钮将项目从左侧列表移动到右侧列表；还假设使用删除按钮将我们添加到右侧列表的任何项目移回左侧列表。我的代码将左侧列表中的项目添加到右侧列表，但它不包含添加的项目。我尝试添加的下一个项目只是替换旧项目。谁能帮帮我？下面是完整的代码。
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.DefaultListModel;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
public class Window {
private JFrame frame;
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
Window window = new Window();
window.frame.setVisible(true);
}
catch (Exception e) {
e.printStackTrace();
}
}
});
}
public Window() {
frame = new JFrame();
frame.setBounds(100, 100, 450, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().setLayout(null);
initialize();
}
public void initialize() {
//Creating the Panel for Menu Bar
JPanel panel = new JPanel();
panel.setBounds(0, 0, 434, 23);
frame.getContentPane().add(panel);
panel.setLayout(new BorderLayout(0, 0));
//Creating the Menu File Bar
JMenuBar bar = new JMenuBar();
panel.add(bar, BorderLayout.NORTH);
JMenu file = new JMenu("File");
JMenuItem load = new JMenuItem("Load");
JMenuItem save = new JMenuItem("Save");
JMenuItem exit = new JMenuItem("Exit");
file.add(load);
file.add(save);
file.add(exit);
bar.add(file);
//Populate Left List with part names
final DefaultListModel parts = new DefaultListModel();
parts.addElement("Case");
parts.addElement("Motherboard");
parts.addElement("CPU");
parts.addElement("GPU");
parts.addElement("PSU");
parts.addElement("RAM");
parts.addElement("HDD");
final JList leftList = new JList(parts);
leftList.setBounds(10, 26, 142, 224);
frame.getContentPane().add(leftList);
//create right list
final DefaultListModel partSelected = new DefaultListModel();
final JList rightList = new JList();
rightList.setBounds(282, 26, 142, 224);
frame.getContentPane().add(rightList);
//add event to the button to move items from left list to right list
JButton btnNewButton = new JButton(">>");
btnNewButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
rightList.setListData(leftList.getSelectedValues());
for (Object selectedValue : leftList.getSelectedValuesList()) {
partSelected.addElement(selectedValue);
parts.removeElement(selectedValue);
int iSelected = leftList.getSelectedIndex();
if (iSelected == -1) {
return;
}
}
}
});
btnNewButton.setBounds(172, 86, 89, 23);
frame.getContentPane().add(btnNewButton);
//Remove Button
JButton remove = new JButton("<<");
remove.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
rightList.setListData(leftList.getSelectedValues());
for (Object selectedValue : rightList.getSelectedValuesList()) {
parts.addElement(selectedValue);
int selected = rightList.getSelectedIndex();
if (selected == -1) {
return;
}
partSelected.removeElement(selectedValue);
}
}
});
remove.setBounds(172, 140, 89, 23);
frame.getContentPane().add(remove);
}
}
【问题讨论】：
-
您可以为此使用library。或者看看那里的代码是如何完成的。