There's an error in my program saying error: class, interface, or enum expected. What to do?

Question

ILS Class:

import java.util.Scanner;

class iLs {
    private String name;
    private String section;
    private double one;
    private double two;
    private double three;
    private double four;
    private double genave;


    public iLs(String name, String section, double one, double two, double three, double four, double genave){


        this.name =  name;
        this.section = section;
        this.one = one;
        this.two = two;
        this.three = three;
        this.four = four;
        this.genave = genave;

    }


    public void setName(String name){
        this.name = name;
    }


    public void setSection(String section){
        this.section = section;

    }

    public void setOne(String one){
        this.one = one;

    }

    public void setTwo(String two){
        this.two = two;
    }


    public void setThree(String three){
        this.three = three;
    }


    public void setFour(String four){
        this.four = four;
    }


    public void setGenave(String genave){
        this.genave = genave;
    }


    public String getName(){
        return name;
    }


    public String getSection(){
        return section;
    }


    public double getOne(){
        return one;
    }


     public double getTwo(){
        return two;
    }


    public double getThree(){
        return three;
    }


    public double getFour(){
        return four;
    }


    public double getGenave(){
        return genave;
    }
}

Student Class:

import java.util.Scanner;

class Student {
    public static void main(String args[]) {
        String name;
        String section;
        double one;
        double two;
        double three;
        double four;
        double genave;


        iLs a =  new iLs();
        Scanner input = new Scanner(System.in);


        a.setName = (input.nextLine());
        a.setSection = (input.nextLine());
        a.setOne = (input.nextLine());
        a.setTwo = (input.nextLine());
        a.setThree = (input.nextLine());
        a.setFour = (input.nextLine());
        a.setGenave = (input.nextLine());


        System.out.println("Name: " + a.getName());
        System.out.println("\nSection: " + a.getSection());
        System.out.println("\n1q: " + a.getOne());
        System.out.println("\n2q: " + a.getTwo());
        System.out.println("\n3q: " + a.getThree());
        System.out.println("\n4q: " + a.getFour());
        System.out.println("\nGeneral Average: " + a.getGenave());
    }
}

At first, i don't have public class so the program demanded wants a public class. But when I do, this happened, error: class, interface, or enum expecte HELP!!!

I don't know what to do and I'm so new to Computer Programming.

How many files do you have? How are they named? And : check the indenting of your in question. — GhostCat, Oct 05 '18 at 02:17
Beyond that, I tried to give an answer. If that fits: consider accepting the answer. Otherwise drop me a comment and improve your question (for example by giving the exact error message including line numbers. — GhostCat, Oct 05 '18 at 02:20
Please indent your code properly so it's easy to see different sections. I have done it for you this time. — user2004685, Oct 05 '18 at 02:23

score 2 · Answer 1 · answered Oct 05 '18 at 02:26

In addition to the answer given by @ghostCat, the code of Student includes

iLs a =  new iLs();

however in this iLS class there is not a constructor with zero parameters only

public iLs(String name, String section, double one, double two, double three,
                                                  double four, double genave){

score 0 · Answer 2 · answered Oct 05 '18 at 02:19

0

Assuming that the above content is from a single file, then the very first problem is that there is an import statement after the first class definition.

Import statements can appear only once, in the beginning of a class.

answered Oct 05 '18 at 02:19

GhostCat

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score 0 · Answer 3 · answered Oct 05 '18 at 02:25

Have you looked at this? Compiler error: "class, interface, or enum expected"

Also, in Student, you are trying to instantiate a new iLs, but do not have a matching constructor signature. The only constructor declared in iLs takes 7 parameters, and you are trying to call a default constructor (i.e. no params). The default constructor is provided by Java only if there are no other constructors declared. As soon as a constructor is declared, if you want a default constructor, you must declare it as well.

score 0 · Answer 4 · answered Oct 05 '18 at 03:05

The code which you have given is not a working code, since you have a parameterized constructor add default constructor in your ILS class to make iLs a = new iLs(); work in Student class. Change the data types of ILS class or convert the values to match your datatypes. Scanner.nextLine will return string, all your one,two,three,four are double.

There's an error in my program saying error: class, interface, or enum expected. What to do?

4 Answers4