我是Java初学者,正在尝试使用IntelliJ运行我的代码,我刚刚将它安装为JDK 1.7的IDE。下面这段代码甚至不能编译,并不断给我错误:

Error: Could not find or load main class libTest

Code

import java.lang.Integer;
import java.lang.String;
import java.lang.System;
import java.util.*;

class book {

    private String name = "trial";
    private int bookCode=1;
    private int issued=0;

     public void Issue(){
         if(issued==0) {
             issued=1;
             System.out.println("You have succesfully issued the book");
         }
         else {
             System.out.println("The book is already issued. Please contact the librarian for further details");
         }
    }

    public int checkCode() {
        return bookCode;
    }

    String readName() {
        return name;
    }

    public void setName(String newName){
        name=newName;
    }

    public void setBookCode(int newCode){
        bookCode=newCode;
    }
}

class library {
    private ArrayList books=new ArrayList();

    public void getList(){
        for(int bk:books){
            String bName=books(bk).readName();
            System.out.println((bk+1)+")  "+bName);
        }
    }
}

public class libTest{
    public static void main(String[] args){
        library newLib= new library();
        System.out.println("code working");
   }
}

有任何改变,我必须在编译器设置??或者是代码。


当前回答

I am working with Kotlin but am guessing the problem is the same. I would start a project, create a single file and add main to it and the IDE couldn't find the main. I tried the things in this list and none worked. I finally mentioned my frustration on one of the IntelliJ pages and was contacted. Of course, it worked fine for IntelliJ. After a couple of days back and forth, I noticed that the highlight function wasn't working and mentioned that. It turned out something was wrong with the IDE settings. I still don't know specifically what was wrong but the fix in my case was to reset the IDE settings. File->Manage IDE Settings->Restore Default settings. After this, the green triangle start icon became visible to the left of my main function and things continued to work normally for subsequent projects. Thanks to Konstantin at JetBrain's support for his patience.

其他回答

当类在默认文件夹中,即类没有声明包时,我就遇到过这样的问题。

所以我猜使用包语句(例如。将org.me.mypackage;)打包到类顶部应该可以修复它。

文件>项目结构>模块>标记“src”文件夹为源。 这应该能解决问题。此外,检查最新的语言选择,以便您不必更改代码或做任何配置更改。

In my case, the application runs well when code initially was under /src directory under the project. Later I added /main/java directory after the /src, then "Could not find or load main class ..." error happened. At that time you couldn't add /src/main/java/YourMain.java to the run configuration. What I did was to remove the run configuration, then right click the project->Open Module Settings (or F4 after click the Project panel)->Project Settings->Modules delete (x) the old Content Root and + Add Content Root, choose /src/main/java. Rebuild the project and it runs.

对我来说,解决方案是在项目设置下修复输出目录。在此之前,我仅使用“target”作为Project编译器输出。相反,我将其更新为完整路径,例如D:\dev\sigplusjava2_68\target

如果以上答案都不适合你,只需关闭IntelliJ IDE,并从项目的根目录中删除IntelliJ IDE文件和文件夹:

rm -rf .idea *.iml 

然后用IntelliJ打开项目。它现在必须起作用。