The main method in Java

2 years ago

5 minutes

The following is an option for paraphrasing the given sentence natively: “To begin with, let’s delve into the introductory section.”

The main method in Java is typically the initial method taught when beginning Java programming as it serves as the starting point for running a Java program. It can include code to execute or invoke other methods, and it can be situated within any class in a program. Typically, more intricate programs have a class solely dedicated to housing the main method, often named Main.

In the subsequent illustrations, the class named Test includes the primary method.

Here is one possible native paraphrase option for “Test.java”:

Example: “The Java program, Test.java”

public class Test {

	public static void main(String[] args){

		System.out.println("Hello, World!");
	
	}
}

In this article, you will get a grasp of the significance of every element in the main function.

Syntax for Java Main Method

The structure of the main method is consistently:

public static void main(String[] args){
	// some code
}

You have the flexibility to modify only the name of the argument for the String array. For instance, you have the option to change args to myStringArgs. The argument for the String array can also be expressed as either String… args or String args[].

I only need one alternative:

– In regards to the aforementioned matter, I simply require one possible option.

The main method should have a public access modifier for the JRE to access and execute it. When a method isn’t public, its access is limited. In the given code example, the main method lacks the public access modifier.

One possible paraphrase could be “The file Test.java.”

public class Test {

	static void main(String[] args){

		System.out.println("Hello, World!");
	
	}
}

When you compile and execute the program, the mentioned error arises due to the main method not being made public, consequently making it inaccessible for the Java Runtime Environment (JRE) to locate.

javac Test.java
java Test

Output

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

unmoving or immobile

Upon the initiation of the Java program, the absence of a class object is evident. To enable the JVM to load the class into memory and invoke the main method before creating an instance of the class, the main method must possess the static modifier. In the aforementioned code example, the main method lacks the static modifier.

One possible paraphrase could be:
“Java code file named Test.java.”

public class Test {

	public void main(String[] args){

		System.out.println("Hello, World!");
	
	}
}

When you compile and execute the program, you encounter the error indicated below, which is caused due to the main method not being declared as static.

javac Test.java
java Test

Output

Error: Main method is not static in class Test, please define the `main` method as: public static void main(String[] args)

No suggestions were given

Every Java method needs to specify the return type. The return type of the main method in Java is void, indicating that it does not return any value. Once the main method completes its execution, the Java program terminates, hence there is no requirement for a returned object. Here is an example code where the main method tries to return something despite having a void return type.

One available option for paraphrasing “Test.java” natively could be:

The file named “Test.java”.

public class Test {

	public static void main(String[] args){
	
		return 0;
	}
}

When the program is compiled, an error occurs because Java does not anticipate a return value when the return type is void.

javac Test.java

Output

Test.java:5: error: incompatible types: unexpected return value return 0; ^ 1 error

primary

The main method in Java is always named “main.” When a Java program begins execution, it always searches for the main method. The code example below demonstrates a scenario where the main method is renamed as “myMain.”

Please provide the original content that needs to be paraphrased.

public class Test {

	public static void myMain(String[] args){

		System.out.println("Hello, World!");
	}
}

Upon compiling and executing the program, the JRE encounters an error due to its inability to locate the main method within the class.

javac Test.java
java Test

Output

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

args as an array of strings

The main method in Java accepts a single parameter which is an array of strings. Each string in the array represents a command line argument. These command line arguments can be used to modify the program’s behavior or pass information to it while it is running. The code example below demonstrates how to display the command line arguments that are provided when the program is executed.

One possible paraphrase could be: “The file named Test.java.”

public class Test {

	public static void main(String[] args){

    	for(String s : args){
		System.out.println(s);
    	}
	
    }
}

After compiling the program, when it is executed with multiple command line arguments separated by spaces, the terminal displays the printed arguments.

javac Test.java
java Test 1 2 3 “Testing the main method”

Output

1 2 3 Testing the main method

In conclusion, to sum up, to conclude, ultimately, all in all

After reading this article, you acquired knowledge about every element of the Java main method. Enhance your understanding with further Java tutorials.