java 找不到方法_Java程序找不到主方法，在哪里加上呢

importjava.awt.FlowLayout;importjava.awt.event.ActionListener;importjava.awt.event.ActionEvent;importjavax.swing.JFrame;importjavax.swing.JTextField;importjavax.swing.JPa...

import java.awt.FlowLayout;

import java.awt.event.ActionListener;

import java.awt.event.ActionEvent;

import javax.swing.JFrame;

import javax.swing.JTextField;

import javax.swing.JPasswordField;

import javax.swing.JOptionPane;

public class TextFieldFrame extends JFrame

{

private JTextField textField1;

private JTextField textField2;

private JTextField textField3;

private JPasswordField passwordField;

public TextFieldFrame()

{

super("Texting JTextField and JPasswordField");

setLayout(new FlowLayout());

textField1=new JTextField(10);

add(textField1);

textField2=new JTextField("在这里输入文本");

add(textField2);

textField3=new JTextField("Uneditable text field",21);

textField3.setEditable(false);

add(textField3);

passwordField=new JPasswordField("Hidden text");

add(passwordField);

TextFieldHandler handler=new TextFieldHandler();

textField1.addActionListener(handler);

textField2.addActionListener(handler);

textField3.addActionListener(handler);

passwordField.addActionListener(handler);

}

private class TextFieldHandler implements ActionListener

{

public void actionPerformed(ActionEvent event)

{

String string="";

if(event.getSource()==textField1)

{

string=String.format("textField1:%s",event.getActionCommand());

}

else if(event.getSource()==textField2)

{

string=String.format("textField2:%s",event.getActionCommand());

}

else if(event.getSource()==textField3)

{

string=String.format("textField3:%s",event.getActionCommand());

}

else if(event.getSource()==passwordField)

{

string=String.format("passwordField:%s",event.getActionCommand());

}

JOptionPane.showMessageDialog(null,string);

}

}

}

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