Java – error: unable to find or load the main class in the IntelliJ ide

I'm a beginner in Java. I'm trying to run my code using IntelliJ. I just installed JDJ 1.7 as my ide The following code remains not even compiled and continues to give me errors:

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");
   }
}

Do I have to make any changes in the compiler settings? Or code

Solution

This may help:

1) Build menu – > rebuild project Sometimes IntelliJ doesn't override classes because they already exist, so you ask IntelliJ to override everything

2) Run menu – > edit configuration – > delete profile – > Add profile (application, if it is a Java application), select your main class from the main class drop-down menu

3) Build menu – > rebuild project