我有一个JInternalFrame,我想在JTextField中按F1时调用另一个JInternalFrame,但是我得到了NullPointerException。这是我的代码
GUI:
jLabel2.setText("ID:");
getContentPane().add(jLabel2);
jLabel2.setBounds(10, 240, 15, 25);
getContentPane().add(jTextField11);
jTextField11.setBounds(30, 240, 70, 25);
jTextField11.addKeyListener(this);
KeyEvent的:
public void keyPressed(KeyEvent arg0) {
// TODO Auto-generated method stub
if( arg0.getKeyCode() == KeyEvent.VK_F1 ){
listProducto.setVisible(true);******ERROR******
Main.getInstance().getPortada().getDesktop().add(listProducto);
Main.getInstance().getPortada().getDesktop()
.moveToFront(listProducto);
try {
listProducto.setSelected(true);
} catch (PropertyVetoException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
答案 0 :(得分:1)
问题是我忘了在initComponents();
中初始化searchForm这是我失踪的代码。
listProducto = new ListProducto();
listProducto.addSearchEventListener(new searchEventListener() {
public void resultFound(EventObject e) {
listProductoSearchPerformed();
}
});
对于我的搜索,我创建了一个searchForm来处理searchListeners。我也添加了它的代码。
package com.mbpe.search;
import java.beans.PropertyVetoException;
import java.util.ArrayList;
import java.util.Iterator;
import javax.swing.JInternalFrame;
import javax.swing.JInternalFrame;
import com.mbpe.gui.Portada;
import com.mbpe.main.Main;
import com.mbpe.main.searchEvent;
import com.mbpe.main.searchEventListener;
@SuppressWarnings("serial")
public class searchForm extends JInternalFrame {
public searchForm(String title, boolean resizable, boolean closable,
boolean maximizable, boolean iconifiable) {
super(title, resizable, closable, maximizable, iconifiable);
}
private List _listeners = new ArrayList();
public synchronized void addSearchEventListener(searchEventListener listener) {
_listeners.add(listener);
}
public synchronized void removeSearchEventListener(searchEventListener listener) {
_listeners.remove(listener);
}
public synchronized void fireEvent() {
searchEvent event = new searchEvent(this);
Iterator i = _listeners.iterator();
while (i.hasNext()) {
((searchEventListener) i.next()).resultFound(event);
}
}
public void onClose() {
}
public void onClosing() {
dispose();
}
}