Question

我似乎无法使Exit Button工作，因此我的程序无法编译。如果我注释掉与退出按钮相关的所有内容，程序将正常工作并正常运行。所有其他按钮都有效。我的退出按钮出了什么问题？

/**
 * Write a description of class Converterr here.
 * 
 */
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.lang.*;
public class Converterr

{
private JLabel usdL, pesosL, eurosL;
private JTextField usdTF, pesosTF, eurosTF;
private JButton pesosB, eurosB, exitB;
PesosButtonHandler pbHandler;
EurosButtonHandler eubHandler;
ExitButtonHandler ebHandler;

    public void driver() 
    {
        JFrame c = new JFrame ("Currency Converter");
        c.setSize(400,300);
        c.setDefaultCloseOperation(c.EXIT_ON_CLOSE);

        //Content Pane
        Container cp = c.getContentPane ( );
        cp.setLayout ( new GridLayout (5,2) );


        pesosL = new JLabel ("Pesos: ", SwingConstants.RIGHT);
        usdL = new JLabel ("USD:  ", SwingConstants.RIGHT);
        eurosL =  new JLabel ("Euros:  ", SwingConstants.RIGHT);


        usdTF = new JTextField(8);
        pesosTF = new JTextField(8);
        eurosTF = new JTextField(8);

        pesosTF.setEditable(false);
        eurosTF.setEditable(false);

        pesosB = new JButton ("Convert to Pesos");
        eurosB = new JButton ("Convert to Euros");
        exitB = new JButton ("Exit");

        // add to content pane container
        cp.add(usdL);
        cp.add(usdTF);

        cp.add(pesosL);
        cp.add(pesosTF);

        cp.add(eurosL);
        cp.add(eurosTF);

        cp.add(pesosB);
        cp.add(eurosB);
        cp.add(exitB);


        c.setVisible(true);

        //Instantiate Listeners
        pbHandler = new PesosButtonHandler();
        eubHandler = new EurosButtonHandler();
      ebHandler = new ExitButtonHandler();

        pesosB.addActionListener(pbHandler);
        eurosB.addActionListener(eubHandler);
       exitB.addActionListener(ebHandler);
    }

    //action listener interfaces
    private class PesosButtonHandler implements ActionListener
    {
        public void actionPerformed (ActionEvent e)
        {
            double inusd;
            double outpesos;
            inusd = Double.parseDouble(usdTF.getText() );
            outpesos = inusd * 12.31;

            pesosTF.setText(Double.toString(outpesos));    
        }


    }



    private class EurosButtonHandler implements ActionListener
    {
        public void actionPerformed (ActionEvent e)
        {
            double inusd, outeuros;
            inusd = Double.parseDouble(usdTF.getText() );
            outeuros = inusd * .78;
            eurosTF.setText(Double.toString(outeuros));
        }   
    }

   private class ExitButtonHandler implements ActionListener
   {
       public void ActionPerformed (ActionEvent e)
     {
        System.exit(0);
      }    
  }

public static void main (String [ ] args)
        {
            Converterr conv = new Converterr();
            conv.driver();   
        }
    }

错误消息：

Converterr.ExitButtonHandler is not abstract and does not override 
    abstract method actionPerformed(java.awt.event.ActionEnvt) in java.awt.event.ActionListener

Answer 1

   public void ActionPerformed (ActionEvent e)

方法名称中有拼写错误。它应该是：

   public void actionPerformed (ActionEvent e)

GUI：动作侦听器编译器错误

错误消息：

1 个答案: