Problem with the Java pROGRAM

Lab079.java

package src.ex_23042024;


import java.util.Scanner;

public class Lab079 {
    public static void main(String[] args) {

        //✅ Triangle Classifier:
        //
        //   Write a program that classifies a triangle based on its side lengths.
        //   Given three input values representing the lengths of the sides, determine

        //   if the triangle is equilateral (all sides are equal),
        //   isosceles (exactly two sides are equal), or
        //   scalene (no sides are equal).
        //   Use an if-else statement to classify the triangle.

        // side1, side2, side3 ->

        Scanner sc = new Scanner(System.in);
        System.out.println("Enter the side1,side2,side3, I will tell about the triangle");
        int side1 = sc.nextInt();
        int side2 = sc.nextInt();
        int side3 = sc.nextInt();

        // = Assign the value
        // == compare the values



        if((side1 == side2) && (side1 == side3) && (side2 == side3)){
            System.out.println("EQ");
        }else if((side1 == side2) || (side1 == side3) || (side2 == side3)){
            System.out.println("ISO");
        }else{
            System.out.println("Scalene!");
        }






    }
}

How to fix this issue?

My program is not running. It is giving below error
error1 "class PositiveNegativeChecker is public, should be declared in a file named PositiveNegativeChecker.java"
error2 "cannot find symbol variable sc"

My Code:

package JavaBasicCodes;

import java.util.Scanner;

public class PositiveNegativeChecker {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter the Number: ");
int num = sc.nextInt();
PNChecker(num);
}
public static void PNChecker(int num){
if (num >= 1){
System.out.println("Positive Number");
}else if (num < 0){
System.out.println("Negative Number");
}else {
System.out.println("Zero");
sc.close();
}
}
}