Why can not pass "int" as argument in main method

Question

In java when i pass int as argument in main method i got error

"Error: Main method not found in class dynamicInput, please define the main method as: public static void main(String[] args) or a JavaFX application class must extend javafx.application.Application"

Here down is my code:

public class dynamicInput {
    public static void main(int a, int b) {
       System.out.printf("%d %d", a, b);
    }
}

Error clearly says what you should do. Did you try doing it? — Pradeep Simha, Jan 11 '22 at 05:08
The error message seems clear: you have two `int` arguments, but one `String[]` one is expected. (Also, the Java convention is that class names are in TitleCase, not camelCase — ideally, your class should be named `DynamicInput`, and live in `DynamicInput.java`.) — Amadan, Jan 11 '22 at 05:08
Does this answer your question? [Error: Main method not found in class Calculate, please define the main method as: public static void main(String\[\] args)](https://stackoverflow.com/questions/20268262/error-main-method-not-found-in-class-calculate-please-define-the-main-method-a) — Zahid Khan, Jan 11 '22 at 05:27

score 1 · Answer 1 · answered Jan 11 '22 at 05:09

This is due to you can't use different type of variable in main method as java compiler will search for main method with String[] as parameter. you should only use following method as it's an entry point for your console application

public static void main(String[] args) {
    ....
    ....
}

you can get your value provided into console from array of args

so you can do like following

public class DynamicInput {

    public static void main(String args[]) {  
        int a = Integer.parseInt(args[0]);
        int b = Integer.parseInt(args[1]);
        System.out.printf("%d %d", a, b);    
    }
}

you can read about main method here Java main method

Faheem azaz Bhanej · Accepted Answer · 2022-01-11T07:42:59.820

The error tell evething. either you forget to declare main method or somthing missing in main method declaration. In Java Programming The main() method is a special method that serves as the externally exposed entrance point by which a Java program can be run. To compile a Java program, you doesn't really need a main() method in your program. But, while execution JVM searches for the main() method and starts executing from it.

You declare int argument in main method but it shoud be String[] args. now one question arise in your mind Why String args[]? because When you run a Java program from a command line, you are allowed to pass data into that program as comnand line arguments.Your Java program will run from a main() method, and the arguments you typed on the command line will appear to the Java program as Strings in that array.

Here down is right syntex:

public static void main(String[] args) {
    // Some code inside main function....
}

And your code should be:

public class Main {
    static void printSomeNumber()
    {
        int a = 10;
        int b = 20;
        System.out.printf("%d %d", a, b);
    }
    public static void main(String args[]) {  
        printSomeNumber();  
    }
}

Why can not pass "int" as argument in main method

2 Answers2