Java 为什么我得到“没有这样的方法异常”？
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Why do I get "no such method exception"?
提问by Israel Cohen
This is my code and it seems to be fine but when I compile the program I get No Such method exception
这是我的代码，它似乎很好，但是当我编译程序时，我得到 No such method 异常
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.
}
}
And the second class
和第二班
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;
}
}
I get the following exception:
我收到以下异常：
"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)
Process finished with exit code 1
进程以退出代码 1 结束
Do I really have asked such an out of context question that I have gotten those too many negative points?
我真的问了这样一个断章取义的问题，以至于我得到了太多的负面评价吗？
回答by gwenzek
Exception in thread "main" java.lang.NoSuchMethodException: Main.main([Ljava.lang.String;)
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.
这个错误意味着你的编译器没有找到你的主类。当您遇到此类错误时，大多数情况下这意味着您将主类从一个文件移动到另一个文件，而无需更改运行配置。
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.
在 Intellij 中，第一次运行程序时，右键单击包含“public static main(String[] args)”方法的文件。下次单击“运行”时，它会使用相同的文件并查找主类。如果您移动了主类，IDE 无法猜测它，因此会向您抛出此异常。
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.
因此，只需右键单击“Invoyed”类，然后“运行 Invoked.main()”即可重新运行您的代码。请注意，您正在运行的课程显示在绿色运行箭头的左侧。
As a general tip, if you got an error first check you are running the correct class and not some old main class.
作为一般提示，如果您遇到错误，请首先检查您运行的是正确的类，而不是一些旧的主类。
