Problemas abrir outra janela de pagamento

Assuntos Gerais
#1

Olá, pessoal!

Quando calcular e clique abrir outra janela sobre forma de pagamento e apareceu o erro veja mensagem de erro em baixo e depois te mostro os códigos que fiz…

Mensagem de erro

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
	at Exe4.pagamento(Exe4.java:88)
	at Exe4.actionPerformed(Exe4.java:113)
	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
	at java.awt.Component.processMouseEvent(Unknown Source)
	at javax.swing.JComponent.processMouseEvent(Unknown Source)
	at java.awt.Component.processEvent(Unknown Source)
	at java.awt.Container.processEvent(Unknown Source)
	at java.awt.Component.dispatchEventImpl(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
	at java.awt.Container.dispatchEventImpl(Unknown Source)
	at java.awt.Window.dispatchEventImpl(Unknown Source)
	at java.awt.Component.dispatchEvent(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

Código que eu fiz

public class Exe4 implements ActionListener {
	JFrame frame, frame1;
	JPanel panel, panel1,panelLbl,panelRadio;
	JTextField text;
	JButton button,button1,butttonRadio;
	JLabel lbl,lblSoma;
	JRadioButton rb1,rb2,rb3;
	ButtonGroup grupo;
	
	static double soma=0;
	
	public static void main(String[] args) {
		
		Exe4 ex = new Exe4();
		ex.criaJanela();
	}
	
	public void criaJanela(){
		frame = new JFrame("Teste");
		frame.setSize(200,200);
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.setLayout(new GridLayout(3,1));
		
		panel = new JPanel();
		panel.setLayout(new GridLayout(1,2));
		
		button = new JButton("soma");
		button1 = new JButton("Ok");
		
		lbl = new JLabel("Coloca o valor:");
		text = new JTextField(10);
		
		panel.add(lbl);
		panel.add(text);
		
		panelLbl = new JPanel();
		
		lblSoma = new JLabel(String.valueOf(Exe4.soma));
		panelLbl.add(lblSoma);
		
		panel1 = new JPanel();
		
		panel1.setLayout(new GridLayout(1,2));
		panel1.add(button);
		button.addActionListener(this);
		panel1.add(button1);
		button1.addActionListener(this);
		
		frame.add(panel);
		frame.add(panelLbl);
		frame.add(panel1);
		
		frame.setVisible(true);
		
		
	}
	
	public void pagamento(){
		frame1 = new JFrame("Forma do pagamento");
		frame1.setSize(200,200);
		frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame1.setLayout(new GridLayout(2,1));
		
		panelRadio = new JPanel();
		
		rb1 = new JRadioButton("Dinheiro");
		rb2 = new JRadioButton("Crédito");
		rb3 = new JRadioButton("Cheque");
		
		panelRadio.add(rb1);
		panelRadio.add(rb2);
		panelRadio.add(rb3);
		
		grupo.add(rb1);
		grupo.add(rb2);
		grupo.add(rb3);
		
		butttonRadio = new JButton();
		butttonRadio.addActionListener(this);
		
		frame1.add(panelRadio);
		frame1.add(butttonRadio);
		
		frame1.setVisible(true);
	}

	@Override
	public void actionPerformed(ActionEvent e) {
		if(e.getSource() == button){
			
			Exe4.soma+=Double.parseDouble(text.getText());
			
			text.setText(null);
			lblSoma.setText(String.valueOf(Exe4.soma));
			
			
		} else if(e.getSource() == button1){
			Exe4 exe = new Exe4();
			exe.pagamento();
		
		} else if(e.getSource() == butttonRadio){
			
			if(rb1.isSelected()){
				JOptionPane.showMessageDialog(null,"O pagamento do Dinheiro: \nTotal: "+Exe4.soma);
			
			} else if (rb2.isSelected()){
				double total = Exe4.soma * (1 + 0.05);
			    JOptionPane.showMessageDialog(null,"Pagamento do debito: \nAcréscimo:5% \n Total: "+total);
			    
			} else if(rb3.isSelected()){
				double total2 = Exe4.soma * (1+ 0.10);
				JOptionPane.showMessageDialog(null,"Pagamento do Cheque: \nAcréscimo: 10% \n Total: "+total2);
			}
			
		}
		
	}

}

Espero que vocês me ajudem…

#2

olha mano o problema ta na linha 8 no estanciamento do buttongroup
tente colocar assim

#3

[quote=elton santos]olha mano o problema ta na linha 8 no estanciamento do buttongroup
tente colocar assim

Muito obrigado! já tinha esquecido colocar a criar objeto… mas funcionou muito bem… valeu!

#4