Pessoas, sou novo em java e estou criando um projeto para calcular compras em um mercadinho por peso, porém quando vou tentar da esse erro que não consigo entender.
Exception in thread “AWT-EventQueue-0” java.lang.NumberFormatException: empty String
at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1842)
at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110)
at java.lang.Double.parseDouble(Double.java:538)
at mercadinho.mercadinhotela.comprarActionPerformed(mercadinhotela.java:298)
at mercadinho.mercadinhotela.access$200(mercadinhotela.java:18)
at mercadinho.mercadinhotela$3.actionPerformed(mercadinhotela.java:150)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6539)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6304)
at java.awt.Container.processEvent(Container.java:2239)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2297)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4904)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4535)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4476)
at java.awt.Container.dispatchEventImpl(Container.java:2283)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:84)
at java.awt.EventQueue$4.run(EventQueue.java:733)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:74)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:730)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
o meu código é esse:
package mercadinho;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.text.DecimalFormat;
import javax.swing.JOptionPane;
/**
*
-
@author gumiq
*/
public class mercadinhotela extends javax.swing.JFrame {public mercadinhotela() { initComponents(); centralizar(); }
public void centralizar(){ Dimension ds = Toolkit.getDefaultToolkit().getScreenSize(); Dimension dw = getSize(); setLocation((ds.width - dw.width) / 2, (ds.height - dw.height)/2); }
private void initComponents() {
jPanel1 = new javax.swing.JPanel(); jLabel1 = new javax.swing.JLabel(); jLabel2 = new javax.swing.JLabel(); jLabel3 = new javax.swing.JLabel(); batata = new javax.swing.JCheckBox(); cenoura = new javax.swing.JCheckBox(); cebola = new javax.swing.JCheckBox(); bete = new javax.swing.JCheckBox(); pepino = new javax.swing.JCheckBox(); pimentao = new javax.swing.JCheckBox(); tomate = new javax.swing.JCheckBox(); jLabel4 = new javax.swing.JLabel(); jLabel5 = new javax.swing.JLabel(); jLabel6 = new javax.swing.JLabel(); jLabel7 = new javax.swing.JLabel(); jLabel8 = new javax.swing.JLabel(); jLabel9 = new javax.swing.JLabel(); jLabel10 = new javax.swing.JLabel(); qbatata = new javax.swing.JTextField(); qcenoura = new javax.swing.JTextField(); qcebola = new javax.swing.JTextField(); qbete = new javax.swing.JTextField(); qpepino = new javax.swing.JTextField(); qpimentao = new javax.swing.JTextField(); qtomate = new javax.swing.JTextField(); comprar = new javax.swing.JButton(); jScrollPane1 = new javax.swing.JScrollPane(); mostrartotal = new javax.swing.JTextArea(); jLabel11 = new javax.swing.JLabel();
}
private void comprarActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:double xbatata = Double.parseDouble(qbatata.getText()); double xcenoura = Double.parseDouble(qcenoura.getText()); double xcebola = Double.parseDouble(qcebola.getText()); double xbete = Double.parseDouble(qbete.getText()); double xpepino = Double.parseDouble(qpepino.getText()); double xpimentao = Double.parseDouble(qpimentao.getText()); double xtomate = Double.parseDouble(qtomate.getText()); double compra; if(batata.isSelected()){ xbatata = xbatata * 1.50; } if(cenoura.isSelected()){ xcenoura = xcenoura * 2.00; } if(cebola.isSelected()){ xcebola = xcebola * 3.10; } if(bete.isSelected()){ xbete = xbete * 2.35; } if(pepino.isSelected()){ xpepino = xpepino * 1.85; } if(pimentao.isSelected()){ xpimentao = xpimentao * 3.00; } if(tomate.isSelected()){ xtomate = xtomate * 3.50; } compra = xbatata + xcenoura + xcebola + xbete + xpepino + xpimentao + xtomate; DecimalFormat formato = new DecimalFormat("###.##") ; mostrartotal.setText("R$" + Double.toString((compra)));