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

In my case the problem seemed to be related to upgrading IntelliJ. When I did this I overwrote the files from the old IntelliJ with the files from the new IntelliJ (2017 community to 2018 community). After that all of my projects were broken. I tried everything in this thread and none of them worked. I tried upgrading gradle to the latest version (4 to 4.8) and that didn't work. The only thing that worked for me was deleting the entire IntelliJ folder and reinstalling it. All of my projects worked after that.

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。

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。

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

简单的解决方案是在命令行中转到受支持的文件夹,其中是项目的根文件夹。您应该在您的机器中安装SBT。

如果你已经安装了sbt,请运行命令“sbt package”,这将重新编译项目,如果它成功,回到intelliJ它将工作。

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。