JAVA中，下面一段关于“通过流完成数据文件读取与显示”的代码，为什么不能正常编译呢?

Question

 import java.awt.*;
import java.awt.event.*;
import java.awt.Color.*;
import java.io.*;

class File extends Frame implements FocusListener,ActionListener
{
    TextArea ta=new TextArea("",10,30);
    TextField tf=new TextField(30);
    Button b=new Button("读取数据");


    File()
    {

        this.add(ta,"North");
        this.add(tf,"Center");
        this.add(b,"South");

        tf.addFocusListener(this);
        tf.setText("在此输入文件路径…");
        tf.setForeground(Color.gray);

        b.addActionListener(this);

        this.pack();
        this.setVisible(true);
    }

    public void focusGained(FocusEvent e)
    {
        if(e.getSource()==tf)
            {
                tf.setText("");
                tf.setForeground(Color.black);
            }

    }
    public void focusLost(FocusEvent e){}


    File f;
    FileInputStream fi;
    BufferedReader br;
    public void actionPerformed(ActionEvent e)
    {
        f=new File(tf.getText());
        fi=new FileInputStream(f);
        br=new BufferedReader(new InputStreamReader(fi));
        String strText=null;

        while((strText=br.readLine())!=null)
        {
            strText=strText+"\n";
        }

        ta.setText(strText);
    }


    public static void main(String[] args)
    {
        new File();
    }
}

Answer 1

把你的类名改成FileFrame或者其它非File的类名，并修改构造函数名就好了