Java 如何在KeyEventDispatcher激发后释放KeyEvents事件?
我正试图在java中为JFrame表单实现一个KeyListener。到目前为止,我使用了 并且得到了相当好的结果,但是当事件触发时(当按下任何所需的键时),似乎不仅我按下了最后一个键,而且随着事件的继续,我得到了2、3等键的值(可以通过显示的JOptionPane.showMessageDialog()的数量看到) 如何将事件的评估限制为仅按最后一个键?或者,如何在每次触发事件时“清除”按键数组 以下是我的表格的完整代码:Java 如何在KeyEventDispatcher激发后释放KeyEvents事件?,java,swing,jframe,keylistener,keyboard-events,Java,Swing,Jframe,Keylistener,Keyboard Events,我正试图在java中为JFrame表单实现一个KeyListener。到目前为止,我使用了 并且得到了相当好的结果,但是当事件触发时(当按下任何所需的键时),似乎不仅我按下了最后一个键,而且随着事件的继续,我得到了2、3等键的值(可以通过显示的JOptionPane.showMessageDialog()的数量看到) 如何将事件的评估限制为仅按最后一个键?或者,如何在每次触发事件时“清除”按键数组 以下是我的表格的完整代码: import java.awt.event.*; import jav
import java.awt.event.*;
import javax.swing.KeyStroke;
import javax.swing.Action;
import javax.swing.JOptionPane;
import java.awt.KeyEventDispatcher;
import java.awt.KeyEventPostProcessor;
import java.awt.KeyboardFocusManager;
public class frmMain extends javax.swing.JFrame {
char optionselected;
String other;
private class MyDispatcher implements KeyEventDispatcher {
@Override
public boolean dispatchKeyEvent(KeyEvent e) {
if (e.getID() == KeyEvent.KEY_RELEASED) { optionselected = e.getKeyChar(); }
other = String.valueOf(optionselected).toUpperCase();
switch (other) {
case "C": JOptionPane.showMessageDialog(null, "Option 1"); break;
case "T": JOptionPane.showMessageDialog(null, "Option 2"); break;
case "D": JOptionPane.showMessageDialog(null, "Option 3"); break;
case "N": JOptionPane.showMessageDialog(null, "Option 4"); break;
case "O": JOptionPane.showMessageDialog(null, "Option 5"); break;
case "S": JOptionPane.showMessageDialog(null, "Option 6"); break;
default: break;
}
return false;
}
}
/**
* Creates new form frmMain
*/
public frmMain() {
initComponents();
KeyboardFocusManager manager = KeyboardFocusManager.getCurrentKeyboardFocusManager();
manager.addKeyEventDispatcher(new MyDispatcher());
}
/**
* 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() {
jInternalFrame1 = new javax.swing.JInternalFrame();
jDesktopPane1 = new javax.swing.JDesktopPane();
mbarMenu = new javax.swing.JMenuBar();
mnuConta = new javax.swing.JMenu();
mnuTeso = new javax.swing.JMenu();
mnuDiezmo = new javax.swing.JMenu();
mnuNomi = new javax.swing.JMenu();
mnuCole = new javax.swing.JMenu();
mnuExit = new javax.swing.JMenu();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setMaximumSize(new java.awt.Dimension(800, 600));
setMinimumSize(new java.awt.Dimension(800, 600));
setPreferredSize(new java.awt.Dimension(800, 600));
setResizable(false);
jInternalFrame1.setMaximumSize(new java.awt.Dimension(1000, 607));
jInternalFrame1.setMinimumSize(new java.awt.Dimension(1000, 607));
jInternalFrame1.setPreferredSize(new java.awt.Dimension(1000, 607));
jInternalFrame1.setVisible(true);
mnuConta.setIcon(new javax.swing.ImageIcon(getClass().getResource("/icons/books_noun_9566_cc.png"))); // NOI18N
mnuConta.setText("[C] = Option 1");
mnuConta.setFont(new java.awt.Font("Arial", 0, 12)); // NOI18N
mbarMenu.add(mnuConta);
mnuTeso.setIcon(new javax.swing.ImageIcon(getClass().getResource("/icons/money_noun_197480_cc.png"))); // NOI18N
mnuTeso.setText("[T] = Option 2");
mnuTeso.setFont(new java.awt.Font("Arial", 0, 12)); // NOI18N
mbarMenu.add(mnuTeso);
mnuDiezmo.setIcon(new javax.swing.ImageIcon(getClass().getResource("/icons/diezmador_noun_247665_cc.png"))); // NOI18N
mnuDiezmo.setText("[D] = Option 3");
mnuDiezmo.setFont(new java.awt.Font("Arial", 0, 12)); // NOI18N
mbarMenu.add(mnuDiezmo);
mnuNomi.setIcon(new javax.swing.ImageIcon(getClass().getResource("/icons/payroll_noun_233106_cc.png"))); // NOI18N
mnuNomi.setText("[N] = Option 4");
mnuNomi.setFont(new java.awt.Font("Arial", 0, 12)); // NOI18N
mbarMenu.add(mnuNomi);
mnuCole.setIcon(new javax.swing.ImageIcon(getClass().getResource("/icons/school_noun_147545_cc.png"))); // NOI18N
mnuCole.setText("[O] = Option 5");
mnuCole.setFont(new java.awt.Font("Arial", 0, 12)); // NOI18N
mbarMenu.add(mnuCole);
mnuExit.setIcon(new javax.swing.ImageIcon(getClass().getResource("/icons/logout_noun_14841_cc.png"))); // NOI18N
mnuExit.setText("[S] = Option 6");
mnuExit.setFont(new java.awt.Font("Arial", 0, 12)); // NOI18N
mnuExit.addMouseListener(new java.awt.event.MouseAdapter() {
public void mouseClicked(java.awt.event.MouseEvent evt) {
mnuExitMouseClicked(evt);
}
});
mbarMenu.add(mnuExit);
jInternalFrame1.setJMenuBar(mbarMenu);
javax.swing.GroupLayout jInternalFrame1Layout = new javax.swing.GroupLayout(jInternalFrame1.getContentPane());
jInternalFrame1.getContentPane().setLayout(jInternalFrame1Layout);
jInternalFrame1Layout.setHorizontalGroup(
jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jDesktopPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 989, Short.MAX_VALUE)
);
jInternalFrame1Layout.setVerticalGroup(
jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jDesktopPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 539, Short.MAX_VALUE)
);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jInternalFrame1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jInternalFrame1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void mnuExitMouseClicked(java.awt.event.MouseEvent evt) {
this.dispose();
System.exit(0);
}
/**
* @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(frmMain.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(frmMain.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(frmMain.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(frmMain.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new frmMain().setVisible(true);
}
});
}
public static void salida(){
System.exit(0);
}
// Variables declaration - do not modify
private javax.swing.JDesktopPane jDesktopPane1;
private javax.swing.JInternalFrame jInternalFrame1;
private javax.swing.JMenuBar mbarMenu;
private javax.swing.JMenu mnuCole;
private javax.swing.JMenu mnuConta;
private javax.swing.JMenu mnuDiezmo;
private javax.swing.JMenu mnuExit;
private javax.swing.JMenu mnuNomi;
private javax.swing.JMenu mnuTeso;
// End of variables declaration
}
导入java.awt.event.*;
导入javax.swing.KeyStroke;
导入javax.swing.Action;
导入javax.swing.JOptionPane;
导入java.awt.KeyEventDispatcher;
导入java.awt.KeyEventPostProcessor;
导入java.awt.KeyboardFocusManager;
公共类frmMain扩展了javax.swing.JFrame{
选择字符选项;
其他字符串;
私有类MyDispatcher实现KeyEventDispatcher{
@凌驾
公共布尔dispatchKeyEvent(KeyEvent e){
如果(e.getID()==KeyEvent.KEY_RELEASED){optionselected=e.getKeyChar();}
other=String.valueOf(optionselected.toUpperCase();
开关(其他){
案例“C”:JOptionPane.showMessageDialog(null,选项1);中断;
案例“T”:JOptionPane.showMessageDialog(null,“选项2”);中断;
案例“D”:JOptionPane.showMessageDialog(null,“选项3”);中断;
案例“N”:JOptionPane.showMessageDialog(null,“选项4”);中断;
案例“O”:JOptionPane.showMessageDialog(null,“选项5”);中断;
案例“S”:JOptionPane.showMessageDialog(null,“选项6”);中断;
默认:中断;
}
返回false;
}
}
/**
*创建新表单frmMain
*/
公共财政收入(){
初始化组件();
KeyboardFocusManager=KeyboardFocusManager.getCurrentKeyboardFocusManager();
manager.addKeyEventDispatcher(新的MyDispatcher());
}
/**
*从构造函数中调用此方法来初始化表单。
*警告:不要修改此代码。此方法的内容始终为
*由表单编辑器重新生成。
*/
@抑制警告(“未选中”)
//
私有组件(){
jInternalFrame1=newjavax.swing.JInternalFrame();
jDesktopPane1=newjavax.swing.JDesktopPane();
mbarMenu=newjavax.swing.JMenuBar();
mnuConta=newjavax.swing.JMenu();
mnuTeso=newjavax.swing.JMenu();
mnuDiezmo=newjavax.swing.JMenu();
mnuNomi=newjavax.swing.JMenu();
mnuCole=newjavax.swing.JMenu();
mnuExit=newjavax.swing.JMenu();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
setMaximumSize(新java.awt.Dimension(800600));
setMinimumSize(新java.awt.Dimension(800600));
setPreferredSize(新的java.awt.Dimension(800600));
可设置大小(假);
jInternalFrame1.setMaximumSize(新java.awt.Dimension(1000607));
jInternalFrame1.setMinimumSize(新java.awt.Dimension(1000607));
jInternalFrame1.setPreferredSize(新java.awt.Dimension(1000607));
jInternalFrame1.setVisible(true);
mnuConta.setIcon(新的javax.swing.ImageIcon(getClass().getResource(“/icons/books\u noun\u 9566\u cc.png”));//NOI18N
mnuConta.setText(“[C]=选项1”);
mnuConta.setFont(新的java.awt.Font(“Arial”,0,12));//NOI18N
mbarMenu.add(mnuConta);
mnuTeso.setIcon(新的javax.swing.ImageIcon(getClass().getResource(“/icons/money\u noun\u 197480\u cc.png”);//NOI18N
mnuTeso.setText(“[T]=选项2”);
mnuTeso.setFont(新的java.awt.Font(“Arial”,0,12));//NOI18N
mbarMenu.add(mnuTeso);
mnuDiezmo.setIcon(新的javax.swing.ImageIcon(getClass().getResource(“/icons/diezmador_noun_247665_cc.png”);//NOI18N
mnuDiezmo.setText(“[D]=选项3”);
mnuDiezmo.setFont(新的java.awt.Font(“Arial”,0,12));//NOI18N
mbarMenu.add(mnuDiezmo);
mnuNomi.setIcon(新的javax.swing.ImageIcon(getClass().getResource(“/icons/payroll_noun_233106_cc.png”);//NOI18N
mnuNomi.setText(“[N]=选项4”);
mnuNomi.setFont(新的java.awt.Font(“Arial”,0,12));//NOI18N
mbarMenu.add(mnuNomi);
mnuCole.setIcon(新的javax.swing.ImageIcon(getClass().getResource(“/icons/school\u noun\u 147545\u cc.png”);//NOI18N
mnuCole.setText(“[O]=选项5”);
mnuCole.setFont(新的java.awt.Font(“Arial”,0,12));//NOI18N
mbarMenu.add(mnuCole);
mnuExit.setIcon(新的javax.swing.ImageIcon(getClass().getResource(“/icons/logout\u noon\u 14841\u cc.png”);//NOI18N
mnuExit.setText(“[S]=选项6”);
mnuExit.setFont(新的java.awt.Font(“Arial”,0,12));//NOI18N
mnuExit.addMouseListener(新java.awt.event.MouseAdapter(){
public void mouseClicked(java.awt.event.MouseEvent evt){
mnuExitMouseClicked(evt);
}
});
mbarMenu.add(mnuExit);
jInternalFrame1.setJMenuBar(mbarMenu);
javax.swing.GroupLayout jInternalFrame1Layout=newjavax.swing.GroupLayout(jInternalFrame1.getContentPane());
jInternalFrame1.getContentPane().setLayout(jInternalFrame1Layout);
jInternalFrame1Layout.setHorizontalGroup(
jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jDesktopPane1,javax.swing.GroupLayout.DEFAULT_SIZE,989,Short.MAX_VALUE)
);
jInternalFrame1Layout.setVerticalGroup(
jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jDesktopPane1,javax.swing.GroupLayout.DEFAULT\u SIZE,539,Short.MAX\u值)
e.consume();
private class MyDispatcher implements KeyEventDispatcher {
@Override
public boolean dispatchKeyEvent(KeyEvent e) {
if (e.getID() == KeyEvent.KEY_RELEASED) {
optionselected = e.getKeyChar();
other = String.valueOf(optionselected).toUpperCase();
switch (other) {
case "C":
JOptionPane.showMessageDialog(null, "Option 1");
break;
case "T":
JOptionPane.showMessageDialog(null, "Option 2");
break;
case "D":
JOptionPane.showMessageDialog(null, "Option 3");
break;
case "N":
JOptionPane.showMessageDialog(null, "Option 4");
break;
case "O":
JOptionPane.showMessageDialog(null, "Option 5");
break;
case "S":
JOptionPane.showMessageDialog(null, "Option 6");
break;
default:
break;
}
}
return false;
}
}