为什么我会得到“无此类方法异常"? [英] Why do I get "no such method exception"?

问题描述

这是我的代码，似乎很好，但是当我编译程序时，我没有No Such method exception

This is my code and it seems to be fine but when I compile the program I get No Such method exception

import java.io.IOException;

public class Invoked {

 public static String celebname = "Sometext" ;
 public static  String urladdress = "someurl
public static void main(String args[])  {

Main.setpagesource(celebname);
Main.seturl(urladdress);

    try {
        Main.Calculate();
    } catch (IOException e) {
        e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
    }
    //To change body of catch statement use File | Settings | File Templates.
    }

}

第二班

import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class Main {


public static String address;
public static String celebfilename;
public static String pagesource;

public static void Calculate() throws MalformedURLException {

      URL url1 = new URL(address) ;
    URLConnection connection1 = null;
    try {
        connection1 = url1.openConnection();
    } catch (IOException e) {
        e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
    }
    BufferedReader br = null;
    try {
        br = new BufferedReader(
                new InputStreamReader(connection1.getInputStream()));
    } catch (IOException e) {
        e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
    }
    String fileName = "C:\\Users\\Dell\\Documents\\"+"pagesource"+".txt";
    File file = new File(fileName);

    if (!file.exists()) {
        try {
            file.createNewFile();
        } catch (IOException e) {
            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
        }
    }

    FileWriter fw = null;
    try {
        fw = new FileWriter(fileName);
    } catch (IOException e) {
        e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
    }
    BufferedWriter bw = new BufferedWriter(fw);

    String textreader;
    try {
        while ((textreader = br.readLine()) != null) {
            bw.write(textreader);
        }
    } catch (IOException e) {
        e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.
    }


 }

 public static void seturl(String addressname){

   address = addressname;
}

 public static void settextfilename(String celebfilename1){
   celebfilename = celebfilename1;
}


 public static void setpagesource(String pagesourcename){
    pagesource = pagesourcename;
 }
 }

我得到以下异常:

"C:\Program Files\Java\jdk1.7.0_07\bin\java" -Didea.launcher.port=7541 "-Didea.launcher.bin.path=C:\Program Files (x86)\JetBrains\IntelliJ IDEA 12.0.1\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.7.0_07\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\jce.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\jfxrt.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\resources.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\rt.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.7.0_07\jre\lib\ext\zipfs.jar;C:\Users\Dell\IdeaProjects\untitled6\out\production\untitled6;C:\Program Files (x86)\JetBrains\IntelliJ IDEA 12.0.1\lib\idea_rt.jar" com.intellij.rt.execution.application.AppMain Main


Exception in thread "main" java.lang.NoSuchMethodException: Main.main([Ljava.lang.String;)
at java.lang.Class.getMethod(Class.java:1622)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:113)

以退出代码1完成的过程

Process finished with exit code 1

我真的问过一个脱离上下文的问题，我得到了太多的负面意见吗?

Do I really have asked such an out of context question that I have gotten those too many negative points?

推荐答案

Exception in thread "main" java.lang.NoSuchMethodException: Main.main([Ljava.lang.String;)

此错误表示您的编译器未找到您的主类.出现此类错误时，大多数情况下，这意味着您将主类从文件移到了另一个文件，而没有更改运行配置.

This error means your compiler didn't find your main class. When you have this kind of error, most of the time it meanss you moved your main class from a file to another without changing your run configuration.

在Intellij中，第一次运行程序时，右键单击包含公共静态main(String [] args)"方法的文件.下次单击运行"时，它将使用相同的文件并查找主类.如果您移动了主类，IDE将无法猜测它，因此会抛出此异常.

In Intellij, the first time you run your program you right-click on a file containing a "public static main(String[] args)" method. The next time you click on "run" it use the same file and look for a main class. If you moved your main class, the IDE can't guess it and therefore throw you this exception.

因此，只需右键单击"Invoyed"类，然后再运行运行Invoked.main()"，即可重新运行代码.请注意，您正在运行的班级显示在绿色运行箭头的左侧.

So just rerun your code with right-click on the "Invoyed" class, then "run Invoked.main()". Note that the class you are running is displayed left of the green run arrow.

作为一般性提示，如果首先出错，请检查您正在运行的是正确的类，而不是某些旧的主类.

As a general tip, if you got an error first check you are running the correct class and not some old main class.

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