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

什么都试过了,运气不佳。最后,对我来说(在Mac上)有效的简单解决方案是:

当项目处于打开状态时,转到查找器并将SRC目录移出项目文件夹。IntelliJ意识到src不再存在,并更新自己。 在项目仍然打开的情况下,将SRC目录移回原位。IntelliJ更新了它的项目配置,此时一切正常。

其他回答

我在使用Scala/SBT时得到了这个错误。IntelliJ无法找到主类,尽管一切都设置正确。 我的解决方案是:删除<用户>/。sbt/<version>/plugins/目标文件夹,然后重启IntelliJ。

您可能指定了一个错误的包,并且包的层次结构也不正确。看下面

在这种情况下,ide会突出显示错误的路径。

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.

当我的Java类在src/main/kotlin目录下时,我遇到了这个问题。当我把它移到src/main/java后,问题就不存在了。

我遇到了这个问题,我尝试了我能想到的所有方法,在这个网站上。

从远程分支提取后,没有提取任何Java类。在项目层次结构中,所有类的名字都是红色的j,而不是蓝色的c。

最后,我尝试遵循本教程和几个步骤,尝试了一些没有描述的东西,并修复了问题: https://www.jetbrains.com/help/idea/creating-and-managing-modules.html

以下是我所做的:

进入文件|项目结构,或按Crtl+Shift+Alt+S 在Project Settings部分下选择Modules。 在Sources选项卡中单击“Mark as:”行上的Sources。 单击Apply按钮。

因为某种原因,我所有的课都是蓝C。

对IntelliJ和/或IDE有更好理解的人可能能够解释这种现象,但我所知道的是,现在它可以看到所有的类,更重要的是主类,并运行。