Eclipse Juno显示错误编辑器不包含主文件，我认为编辑器有一些错误而不是代码

Question

import java.io.*;
import java.net.*;
public class JavaSourceViewer{
  public static void main(String[] args) throws IOException {
    String java.io.BufferedReader.readLine() throws IOException
    System.out.print("Enter url of local for viewing html source code: ");
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    String url = br.readLine();
    try {
        URL u = new URL(url);
        HttpURLConnection uc = (HttpURLConnection) u.openConnection();
        int code = uc.getResponseCode();
        String response = uc.getResponseMessage();
        System.out.println("HTTP/1.x " + code + " " + response);
        InputStream in = new BufferedInputStream(uc.getInputStream());
        Reader r = new InputStreamReader(in);
        int c;
        FileOutputStream fout=new FileOutputStream("D://web-content.txt");
        while ((c = r.read()) != -1) {
            System.out.print((char)c);
            fout.write(c);
        }
        fout.close();
        } catch (MalformedURLException ex) {
            System.err.println(url + " is not a valid URL.");
        } catch (IOException ie) {
            System.out.println("Input/Output Error: " + ie.getMessage());
        }
    }
}  

我不知道这有什么问题，但是代码不仅显示错误而运行。

Answer 1

它是代码。看起来您遇到了复制/粘贴错误。不允许在其他方法的主体中使用方法声明。从main方法中删除此分部方法声明

String java.io.BufferedReader.readLine() throws IOException

Answer 2

有时重新启动日食可以解决这个问题。还要确保 jdk 路径准确，并尝试再次配置它，最后使用 eclipse 工具清理项目