Java 选中和取消选中JCheckBox菜单项ActinListner的状态
我有WordWrap复选框MenuItem。默认情况下,它是未选中(false)状态。当我运行程序并单击New MenuItem并在单击WordWrap MenuItem后写入一些文本时,中的WordWrap状态在前两次中没有更改。我只想第一次更改状态(选中)。我已经尝试过,但没有工作。 以下是代码:Java 选中和取消选中JCheckBox菜单项ActinListner的状态,java,swing,awt,jtextarea,Java,Swing,Awt,Jtextarea,我有WordWrap复选框MenuItem。默认情况下,它是未选中(false)状态。当我运行程序并单击New MenuItem并在单击WordWrap MenuItem后写入一些文本时,中的WordWrap状态在前两次中没有更改。我只想第一次更改状态(选中)。我已经尝试过,但没有工作。 以下是代码: public class CheckBoxMenuItem extends javax.swing.JFrame { int i=0; JTextArea textArea; JScrollPa
public class CheckBoxMenuItem extends javax.swing.JFrame {
int i=0;
JTextArea textArea;
JScrollPane scrollpane;
public CheckBoxMenuItem() {
initComponents();
WordWrap.setSelected(false);
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
tabbedPane = new javax.swing.JTabbedPane();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
Create = new javax.swing.JMenuItem();
WordWrap = new javax.swing.JCheckBoxMenuItem();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jMenu1.setText("File");
Create.setText("Create");
Create.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
CreateActionPerformed(evt);
}
});
jMenu1.add(Create);
WordWrap.setSelected(true);
WordWrap.setText("WordWrap");
WordWrap.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
WordWrapActionPerformed(evt);
}
});
jMenu1.add(WordWrap);
jMenuBar1.add(jMenu1);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tabbedPane, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 400, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(tabbedPane, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void CreateActionPerformed(java.awt.event.ActionEvent evt) {
final JInternalFrame internalFrame = new JInternalFrame("");
i++;
internalFrame.setName("Document"+i);
internalFrame.setClosable(true);
internalFrame.setAutoscrolls(true);
textArea=new JTextArea();
textArea.setFont(new java.awt.Font("Miriam Fixed", 0, 13));
scrollpane=new JScrollPane(textArea);
internalFrame.add(scrollpane);
tabbedPane.add(internalFrame);
internalFrame.setSize(internalFrame.getMaximumSize());
internalFrame.pack();
internalFrame.setVisible(true);
}
private void WordWrapActionPerformed(java.awt.event.ActionEvent evt) {
WordWrap.addItemListener(new ItemListener() {
@Override
public void itemStateChanged(ItemEvent ie) {
AbstractButton button = (AbstractButton) ie.getItem();
if(button.isSelected()){
textArea.setLineWrap(true);
scrollpane.validate();
}
else
{
textArea.setLineWrap(false);
scrollpane.validate();
}
}
});
}
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(CheckBoxMenuItem.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(CheckBoxMenuItem.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(CheckBoxMenuItem.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(CheckBoxMenuItem.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
new CheckBoxMenuItem().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JMenuItem Create;
private javax.swing.JCheckBoxMenuItem WordWrap;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JTabbedPane tabbedPane;
// End of variables declaration
public类CheckBoxMenuItem扩展了javax.swing.JFrame{
int i=0;
JTextArea textArea;
JScrollPane滚动窗格;
公共CheckBoxMenuItem(){
初始化组件();
WordWrap.setSelected(false);
}
@抑制警告(“未选中”)
//
私有组件(){
tabbedPane=newjavax.swing.JTabbedPane();
jMenuBar1=newjavax.swing.JMenuBar();
jMenu1=newjavax.swing.JMenu();
Create=newjavax.swing.JMenuItem();
WordWrap=newjavax.swing.JCheckBoxMenuItem();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setText(“文件”);
Create.setText(“Create”);
Create.addActionListener(新建java.awt.event.ActionListener()){
public void actionPerformed(java.awt.event.ActionEvent evt){
CreateActionPerformed(evt);
}
});
jMenu1.add(Create);
WordWrap.setSelected(true);
setText(“WordWrap”);
addActionListener(新java.awt.event.ActionListener(){
public void actionPerformed(java.awt.event.ActionEvent evt){
执行的文字包装(evt);
}
});
jMenu1.add(WordWrap);
jMenuBar1.add(jMenu1);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout=newjavax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(布局);
layout.setHorizontalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(选项卡窗格,javax.swing.GroupLayout.Alignment.TRAILING,javax.swing.GroupLayout.DEFAULT\u SIZE,400,Short.MAX\u值)
);
layout.setVerticalGroup(
createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(选项卡窗格,javax.swing.GroupLayout.Alignment.TRAILING,javax.swing.GroupLayout.DEFAULT\u SIZE,279,Short.MAX\u值)
);
包装();
}//
私有void CreateActionPerformed(java.awt.event.ActionEvent evt){
最终JInternalFrame internalFrame=新的JInternalFrame(“”);
i++;
internalFrame.setName(“文件”+i);
internalFrame.setClosable(真);
internalFrame.setAutoscrolls(真);
textArea=新的JTextArea();
setFont(新java.awt.Font(“Miriam Fixed”,0,13));
scrollpane=新的JScrollPane(textArea);
添加(滚动窗格);
tabbedPane.add(内部框架);
internalFrame.setSize(internalFrame.getMaximumSize());
internalFrame.pack();
internalFrame.setVisible(true);
}
私有void WordWrapActionPerformed(java.awt.event.ActionEvent evt){
addItemListener(新的ItemListener(){
@凌驾
公共无效itemStateChanged(ItemEvent ie){
AbstractButton=(AbstractButton)即.getItem();
if(button.isSelected()){
textArea.setLineWrap(true);
scrollpane.validate();
}
其他的
{
textArea.setLineWrap(false);
scrollpane.validate();
}
}
});
}
公共静态void main(字符串参数[]){
/*设置Nimbus的外观和感觉*/
//
/*如果Nimbus(在JavaSE6中引入)不可用,请使用默认的外观。
*详情请参阅http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
试一试{
for(javax.swing.UIManager.LookAndFeelInfo:javax.swing.UIManager.getInstalledLookAndFeels()){
if(“Nimbus”.equals(info.getName())){
setLookAndFeel(info.getClassName());
打破
}
}
}捕获(ClassNotFoundException ex){
java.util.logging.Logger.getLogger(CheckBoxMenuItem.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}catch(实例化异常){
java.util.logging.Logger.getLogger(CheckBoxMenuItem.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}捕获(非法访问例外){
java.util.logging.Logger.getLogger(CheckBoxMenuItem.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}catch(javax.swing.UnsupportedLookAndFeelException ex){
java.util.logging.Logger.getLogger(CheckBoxMenuItem.class.getName()).log(java.util.logging.Level.SEVERE,null,ex);
}
//
/*创建并显示表单*/
invokeLater(new Runnable()){
@凌驾
公开募捐{
新建CheckBoxMenuItem().setVisible(true);
}
});
}
//变量声明-不修改
私有javax.swing.JMenuItem创建;
私有javax.swing.JCheckBoxMenuItem WordWrap;
私有javax.swing.JMenu jMenu1;
私有javax.swing.JMenuBar jMenuBar1;
私有javax.swing.JTabbedPane选项卡;
//变量结束声明
}在您的
WordWrapActionPerformed
方法中,除了添加一个ItemListener
之外,您什么也不做,这不会有多大作用
相反,您应该简单地执行活动的要求,例如
private void WordWrapActionPerformed(java.awt.event.ActionEvent evt) {
AbstractButton button = (AbstractButton) evt.getSource();
if (button.isSelected()) {
textArea.setLineWrap(true);
} else {
textArea.setLineWrap(false);
}
textArea.revalidate();
}
或者将GUI属性中菜单项上的侦听器更改为使用itemstener
而不是ActionListener
您可能还想成为farmiluar,这将使您的代码更易于为他人阅读;) 好的,谢谢。我使用的是NetBeans IDE。大部分代码都是由IDE生成的。这就是为什么我需要代码