[Java Interview Manual - Basics] Does the parameter required by the main() method in Java have to be an array of strings?

The answer is yes, the parameter of the main() method must be an array of strings, not other types .

Change the parameter type to String below, and then run the verification.

 package com.magic.main;

public class MainDemo {

    public static void main(String args) {
        System.out.println("Hello World");
    }

}

Running directly in the IDE will output the following error message

 错误: 在类 com.magic.main.MainDemo 中找不到 main 方法, 请将 main 方法定义为:
   public static void main(String[] args)
否则 JavaFX 应用程序类必须扩展javafx.application.Application

When introducing varargs, you can pass varargs of string type as parameters to the main() method, but the varargs must be an array.

 package com.magic.main;

public class MainDemo {

    public static void main(String[] args) {
        System.out.println("Hello World");
    }

}

Or use the variable-length parameter form:

 package com.magic.main;

public class MainDemo {

    public static void main(String... args) {
        System.out.println("Hello World");
    }

}

String[] args is equivalent to String... args , these two forms cannot exist at the same time, such as the following definition is wrong:

 package com.magic.main;

public class MainDemo {

    public static void main(String[] args) {
        System.out.println("Hello World");
    }

    public static void main(String... args) {
        System.out.println("Hello World");
    }
    
}

For more knowledge points related to Java interviews, you can pay attention to the [Java Interview Manual] applet, which involves Java foundation, multithreading, JVM, Spring, Spring Boot, Spring Cloud, Mybatis, Redis, database, data structure and algorithm.