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

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。

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。

尝试检查您的项目名称和完整目录名称,看看是否包含任何“非英语”单词(如亚洲单词),有时这可能是错误的。重命名项目名称或项目路径包含这样的单词并重新打开它可能有效。

这里可以检查的另一件事是传递给JVM的实际命令,并确保它看起来正常。滚动到Run控制台的顶部,它应该是第一行。

“运行配置虚拟机选项”字段中的空格将使应用程序启动命令格式不正确,并可能导致此错误消息

-DsomeArgument="arg with space must be quoted"

这可能会有帮助:

1)“重建”菜单->“重建项目”。 有时Intellij不重写类,因为它们已经存在,这样你就可以让Intellij重写所有的东西。

2)“运行”菜单->“编辑配置”->删除配置文件->添加配置文件(如果是Java应用程序,则为“应用程序”),从“主类”下拉菜单中选择您的主类。

3)“重建”菜单->“重建项目”。

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.