Ayuda ejercicio swing.
Publicado por System.out.println("Me llamo Carlos") (43 intervenciones) el 10/07/2020 18:28:45
Hola buenas, estoy siguiendo un curso de java gratis online, y el profesor ha querido hacer un ejercicio en swing.
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package creador_mensajes;
import java.awt.Checkbox;
import javax.swing.Box;
import javax.swing.JCheckBox;
import javax.swing.JPanel;
public class PanelCentro extends JPanel {private Box verticalBox;
Box tipoBox, tipoDeMensajeBox, mensajeBox, confirmarBox, opcionBox, entradaBox;
public PanelCentro() {
verticalBox = Box.createVerticalBox();
// *************************************tipoBox = Box.createHorizontalBox();
tipoDeMensajeBox = Box.createHorizontalBox();
mensajeBox = Box.createHorizontalBox();
confirmarBox = Box.createHorizontalBox();
opcionBox = Box.createHorizontalBox();
entradaBox = Box.createHorizontalBox();
agregarHorizontal(tipoBox);
add(verticalBox);
}public void agregarHorizontal(Box caja) {
if (caja.equals(tipoBox)) {
JPanel tipoJPanel = new JPanel();
tipoJPanel.setLayout(new EnLinea());
tipoJPanel.add(new JCheckBox("Mensaje"));
tipoJPanel.add(new JCheckBox("Confirmar"));
tipoJPanel.add(new JCheckBox("Opcion"));
tipoJPanel.add(new JCheckBox("Entrada"));
/* Si descomento la instruccion de abajo, me lanza la siguiente exepcion: Exception in thread "main" java.lang.NullPointerException at java.desktop/javax.swing.BoxLayout.checkRequests(BoxLayout.java:478) at java.desktop/javax.swing.BoxLayout.minimumLayoutSize(BoxLayout.java:318) at java.desktop/java.awt.Container.minimumSize(Container.java:1875) at java.desktop/java.awt.Container.getMinimumSize(Container.java:1859) at java.desktop/javax.swing.JComponent.getMinimumSize(JComponent.java:1762) at java.desktop/javax.swing.BoxLayout.checkRequests(BoxLayout.java:475) at java.desktop/javax.swing.BoxLayout.preferredLayoutSize(BoxLayout.java:293) at java.desktop/java.awt.Container.preferredSize(Container.java:1823) at java.desktop/java.awt.Container.getPreferredSize(Container.java:1807) at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1682) at java.desktop/java.awt.FlowLayout.layoutContainer(FlowLayout.java:609) at java.desktop/java.awt.Container.layout(Container.java:1537) at java.desktop/java.awt.Container.doLayout(Container.java:1526) at java.desktop/java.awt.Container.validateTree(Container.java:1722) at java.desktop/java.awt.Container.validateTree(Container.java:1731) at java.desktop/java.awt.Container.validateTree(Container.java:1731) at java.desktop/java.awt.Container.validateTree(Container.java:1731) at java.desktop/java.awt.Container.validateTree(Container.java:1731) at java.desktop/java.awt.Container.validateTree(Container.java:1731) at java.desktop/java.awt.Container.validate(Container.java:1657) at java.desktop/java.awt.Container.validateUnconditionally(Container.java:1694) at java.desktop/java.awt.Window.show(Window.java:1042) at java.desktop/java.awt.Component.show(Component.java:1717) at java.desktop/java.awt.Component.setVisible(Component.java:1664) at java.desktop/java.awt.Window.setVisible(Window.java:1023) at creador_mensajes.FrameCreador.<init>(FrameCreador.java:19) at creador_mensajes.MainCreador.main(MainCreador.java:7)Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at java.desktop/javax.swing.BoxLayout.preferredLayoutSize(BoxLayout.java:294) at java.desktop/java.awt.Container.preferredSize(Container.java:1823) at java.desktop/java.awt.Container.getPreferredSize(Container.java:1807) at java.desktop/javax.swing.JComponent.getPreferredSize(JComponent.java:1682) at java.desktop/java.awt.FlowLayout.layoutContainer(FlowLayout.java:609) at java.desktop/java.awt.Container.layout(Container.java:1537) at java.desktop/java.awt.Container.doLayout(Container.java:1526) at java.desktop/java.awt.Container.validateTree(Container.java:1722) at java.desktop/java.awt.Container.validateTree(Container.java:1731) at java.desktop/java.awt.Container.validateTree(Container.java:1731) at java.desktop/java.awt.Container.validateTree(Container.java:1731) at java.desktop/java.awt.Container.validateTree(Container.java:1731) at java.desktop/java.awt.Container.validateTree(Container.java:1731) at java.desktop/java.awt.Container.validate(Container.java:1657) at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2762) at java.desktop/java.awt.Component.dispatchEvent(Component.java:4844) at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721) at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715) at java.base/java.security.AccessController.doPrivileged(AccessController.java:391) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95) at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745) at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743) at java.base/java.security.AccessController.doPrivileged(AccessController.java:391) at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85) at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742) at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203) at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124) at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113) at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109) at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)*/ // La instruccion: tipoBox.add(tipoJPanel);verticalBox.add(tipoBox);
} else if (caja.equals(tipoDeMensajeBox)) {
JPanel tipoMensajeJPanel = new JPanel();
tipoMensajeJPanel.setLayout(new EnLinea());
tipoMensajeJPanel.add(new JCheckBox());
} else if (caja.equals(mensajeBox)) {
} else if (caja.equals(confirmarBox)) {
} else if (caja.equals(opcionBox)) {
} else if (caja.equals(entradaBox)) {
} else {
System.out.println("No funciona");
} }}Valora esta pregunta
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