我正在对一个我想参加的项目进行评估。对于如何解释、理解或正确使用该项目提供的位于教程点的“教程”,我仍然有些困惑。
使用 Netbeans 8.1 创建的 Jlist --> JFrame Form GUI Builder
public class Window extends javax.swing.JFrame {
/**
* Creates new form for BootcampAssessmentGui
*/
public Window() {
initComponents();
}
/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
controlsbuttonGroup = new javax.swing.ButtonGroup();
partsScrollPane = new javax.swing.JScrollPane();
partsList = new javax.swing.JList<>();
buildScrollPane = new javax.swing.JScrollPane();
buildList = new javax.swing.JList<>();
addButton = new javax.swing.JButton();
removeButton = new javax.swing.JButton();
jMenuBar1 = new javax.swing.JMenuBar();
fileMenu = new javax.swing.JMenu();
loadMenuItem = new javax.swing.JMenuItem();
saveMenuItem = new javax.swing.JMenuItem();
exitMenuItem = new javax.swing.JMenuItem();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setTitle("Devereaux Assessment");
partsList.setModel(new javax.swing.AbstractListModel<String>() {
String[] strings = { "Case", "Motherboard", "CPU", "RAM", "GPU", "HDD", "PSU" };
public int getSize() { return strings.length; }
public String getElementAt(int i) { return strings[i]; }
});
partsScrollPane.setViewportView(partsList);
buildScrollPane.setViewportView(buildList);
addButton.setText(">>");
addButton.setToolTipText("Add Parts to Build list");
controlsbuttonGroup.add(addButton);
addButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
addButtonActionPerformed(evt);
}
});
removeButton.setText("<<");
removeButton.setToolTipText("Remove Parts from Build list");
controlsbuttonGroup.add(removeButton);
removeButton.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
removeButtonActionPerformed(evt);
}
});
fileMenu.setText("File");
loadMenuItem.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_L, java.awt.event.InputEvent.CTRL_MASK));
loadMenuItem.setIcon(new javax.swing.ImageIcon(getClass().getResource("/com/cooksys/assessment/arrow95.png"))); // NOI18N
loadMenuItem.setText("Load");
fileMenu.add(loadMenuItem);
saveMenuItem.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_S, java.awt.event.InputEvent.CTRL_MASK));
saveMenuItem.setIcon(new javax.swing.ImageIcon(getClass().getResource("/com/cooksys/assessment/floppy13.png"))); // NOI18N
saveMenuItem.setText("Save");
fileMenu.add(saveMenuItem);
exitMenuItem.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_X, java.awt.event.InputEvent.CTRL_MASK));
exitMenuItem.setIcon(new javax.swing.ImageIcon(getClass().getResource("/com/cooksys/assessment/exit18.png"))); // NOI18N
exitMenuItem.setText("Exit");
exitMenuItem.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
exitMenuItemActionPerformed(evt);
}
});
fileMenu.add(exitMenuItem);
jMenuBar1.add(fileMenu);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(partsScrollPane, javax.swing.GroupLayout.PREFERRED_SIZE, 209, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 31, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(addButton)
.addComponent(removeButton))
.addGap(28, 28, 28)
.addComponent(buildScrollPane, javax.swing.GroupLayout.PREFERRED_SIZE, 209, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(buildScrollPane, javax.swing.GroupLayout.PREFERRED_SIZE, 279, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(partsScrollPane, javax.swing.GroupLayout.PREFERRED_SIZE, 279, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addGroup(layout.createSequentialGroup()
.addGap(125, 125, 125)
.addComponent(addButton)
.addGap(18, 18, 18)
.addComponent(removeButton)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);
pack();
}// </editor-fold>
private void exitMenuItemActionPerformed(java.awt.event.ActionEvent evt) {
System.exit(0);
}
private void addButtonActionPerformed(java.awt.event.ActionEvent evt) {
// add Parts to buildList
for (Object selectedValue : partsList.getSelectedValuesList()) {
buildList.addElement(selectedValue);
partsList.removeElement(selectedValue);
int iSelected = partsList.getSelectedIndex();
if (iSelected == -1) {
return;
}
}
}
private void removeButtonActionPerformed(java.awt.event.ActionEvent evt) {
// remove Parts from buildList
for (Object selectedValue : buildList.getSelectedValuesList()) {
partsList.addElement(selectedValue);
buildList.removeElement(selectedValue);
int iSelected = buildList.getSelectedIndex();
if (iSelected == -1) {
return;
}
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(Window.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Window.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Window.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Window.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new Window().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JButton addButton;
private javax.swing.JList<String> buildList;
private javax.swing.JScrollPane buildScrollPane;
private javax.swing.ButtonGroup controlsbuttonGroup;
private javax.swing.JMenuItem exitMenuItem;
private javax.swing.JMenu fileMenu;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenuItem loadMenuItem;
private javax.swing.JList<String> partsList;
private javax.swing.JScrollPane partsScrollPane;
private javax.swing.JButton removeButton;
private javax.swing.JMenuItem saveMenuItem;
// End of variables declaration
}
我收到错误找不到符号 - 符号:方法addElement(Object) 位置:Jlist的变量partsList类型
这个错误对我来说非常简单。我的问题是我见过的大多数示例都使用 DefaultListModel。 NetBeans 正在使用 AbstractListModel 方法。
我已查看以下引用资料:
http://www.java2s.com/Code/Java/Swing-JFC/DualJListwithbuttonsinbetween.htm http://docs.oracle.com/javase/tutorial/uiswing/components/list.html#scrollingapi
但老实说,我觉得我没有正确理解如何使用这些源进行调试。我觉得我没有正确使用基于这段代码的对象 --> 字符串:
private void clearDestinationSelected() {
Object selected[] = destList.getSelectedValues();
for (int i = selected.length - 1; i >= 0; --i) {
destListModel.removeElement(selected[i]);
}
destList.getSelectionModel().clearSelection();
}
我将通过注释将此帮助请求包含在代码中。我不是骗子。这几天我一直在观察、工作、搜索和思考这个问题。在这一点上,我觉得寻求帮助是明智的。
最佳答案
API 会在这里为您提供一些帮助,因为如果您查看 JList API,您会发现您的编译器是正确的,JList 没有 addElement(...)
方法,但不要灰心 - DefaultListModel 类确实有这个方法,您可以通过调用 getModel()
从 JList 中提取该方法,然后调用 addElement(...)
在提取的模型上。
编辑:不好,您正在使用从 AbstractListModel 派生的自己的模型 - 您需要使您的模型成为非抽象的 - 给它一个类名,然后给您的 Model 类一个 addElement 方法。或者更简单地说,使用您用数据填充的 DefaultListModel 对象。
关于java - 按钮 ActionPerfomed 将字符串从 JList 移动到 JList,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34698370/