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

在我的案例中,在模块的构建中。gradle mainClassName赋值必须声明完全限定的类名,即。与主类源代码文件中指定的包名相同。

其他回答

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.

打开模块标签(按Ctrl+Shift+Alt+S)。我在一个项目下有两个模块。我在移除第二个冗余模块后解决了这个问题(见截图)。

在尝试了几乎每一个建议在这一步,我仍然不走运。在两台不同的机器上试过。请教一位有经验的同事。

最后:我的问题的解决方案,可能是问题的原因:

在我的mac电脑上,其中一个文件夹名称包含一个正斜杠,就是这样

(我们在共享驱动器上使用了(深度)嵌套的文件夹结构;我的同事在Windows上工作,对路径中的正斜杠没有问题)

注意:虽然我想在这个线程上提供我的答案,但我从stackoverflow得到了一个“警告”,那里已经有超过30个答案。但他,对我毫无用处。因为这是一个可以追溯到2012年的线索,在2023年仍然活跃,有很多答案(以及同一个问题的原因)。我决定在这里也加入我的50美分。希望它能帮助和节省一些人的时间!!

我在Spring中使用IntelliJ,我的主类被包装在JAR中。 我必须在运行/调试配置对话框中标记“包含具有“提供”范围的依赖项”

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。