Java Expect "{" error dont understand

Question

These code gives

error message "Main.java:3: error: '{' expected public class Bister.java {

               1 error"

I can't understand "why is come up ?" .

import java.util.Scanner;

public class Bister.java  {         
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        System.out.print("Input first number: ");
        int num1 = in.nextInt();
        System.out.print("Input second number: ");
        int num2 = in.nextInt();
        System.out.println(num1 + " x " + num2 + " = " + num1 * num2);
     }     
}

Answer 1

Remove .java in source code. change below line

 public class Bister.java {

like this

 public class Bister {

Your code will be like

import java.util.Scanner;

public class Bister {

public static void main(String[] args) {
Scanner in = new Scanner(System.in);

System.out.print("Input first number: "); 
 int num1 = in.nextInt();

System.out.print("Input second number: "); 
int num2 = in.nextInt();

System.out.println(num1 + " x " + num2 + " = " + num1 * num2); }

}

Answer 2

If you call the file Main.java, it should contain public class Main {.
If you want it to be public class Bister {, the file has to be Bister.java
And the .java appears in the filename only, it is not part of the source code.

Answer 3

You need to do two things:

Remove .java in class name Current code: public class Bister.java Update to : public class Bister

Also your file name should be "Bister.java".