i actually trying to do some basic java opertion an confusing error is occuring please have an look

import java.util.Scanner; //import scanner library
                        // an class for read the data of students
class student {
String name,gender;
int roll;
int mark1,mark2,mark3;
void print(){
    System.out.println("Name: " name);
    System.out.println("Roll: " roll);
    System.out.println("Gender: " gender);
}

}
class markstudents extends student{             //extending the class because we have to add more data and functions
void printdata(){
    int total =mark1 mark2 mark3;
    System.out.println("Marks\nMaths; "   mark1  "\nChemistry: "  mark2  "\nComputer: " mark3   "\nTotal: "   total   "\nGrade: ");

    if(total >=90)
        System.out.print("A");
    else if(total >= 80 && total<90)
        System.out.print("B");
    else if(total >= 70 && total<80)
        System.out.print("C");
    else if(total >= 60 && total<70)
        System.out.print("D");
    else if(total >= 50 && total<60)
        System.out.print("E");
    else
        System.out.print("F");
  }
}

class Student_data_inheritance {
public static void main(String[] args){

    //create scanner function

    Scanner sc = new Scanner(System.in);

                                        // Read student details
    System.out.println("Enter the Student details\nName: ");
    String name =sc.nextLine();

    System.out.println("Roll no: ");
    int roll = sc.nextInt();

    System.out.println("Enter the gender: ");
    String gender = sc.nextLine();

    System.out.println("Mark1: ");
    int m1 = sc.nextInt();

    System.out.println("Mark2: ");
    int m2 = sc.nextInt();

    System.out.println("Mark3: ");
    int m3 = sc.nextInt();

    markstudents m = new markstudents();        //creating object and passing the data
    m.name=name;
    m.roll=roll;
    m.gender=gender;
    m.mark1=m1;
    m.mark2=m2;
    m.mark3=m3;

    m.print(); // print from p=super class
    m.printdata(); // print from extended


   }

}





                        

when i try to run this code :java Student_data_inheritance.java

error: can't find main(String[]) method in class: student

but i created an java class with String[] args then also this code is popping an error!

CodePudding user response：

i just resolve the issue by changing filename and class name but still i dont know what cause this issue

CodePudding user response：

I see that the name of your file is student.java. And, your main method is present in the Student_data_inheritance class which is not public (i.e. it's not the main class). Move your main method to the student class, because it looks for the main method in the Main class only.