Can main be overridden in java

How to overload and override main method in Java

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Can we overload the main method in Java?

Yes, we can overload the main method in Java, but When we execute the class JVM starts execution with public static void main (String[] args) method .

Example

public class Sample < public static void main()< System.out.println("This is the overloaded main method"); >public static void main(String args[]) < Sample obj = new Sample(); obj.main(); >>

Output

This is the overloaded main method

Can we Overload or Override static methods in java, We cannot overload two methods in Java if they differ only by static keyword (number of parameters and types of parameters is the same). See the …

Can we overload a main() method in Java?

Question: Can we overload a main () method in Java ?:Answer: Yes, you can overload main method in Java . But the program doesn’t execute the overloaded …

Can we overload main method in java?

#learnwithkrishnasandeep #javacodinginterviewquestions #javaexamples #javaprograms #javatutorials #javaprogramming can overload main method …

How to overload and override main method in Java

How to overload main method in java?

Method Overloading can be defined as a feature in which a class can have more than one method having the same name if and only if they differ by number of parameters or the type of parameters or both, then they may or may not have same return type. Method overloading is one of the ways that java support Polymorphism .
Yes , We can overload the Main Method in java but JVM only calls the original main method, it will never call our overloaded main method .
Below example illustrates the overloading of main() in java
Example 1:

Источник

Can we overload and override the main() method in Java?

In this post, we will look at whether we can overload or override the main method in Java? But first, we would recommend you read the articles about method overloading and method overriding to understand these concepts.

Let’s look at the above points one by one.

Can we overload the main method in Java?

Method overloading is a technique by which multiple methods can have the same name but with different numbers or types of parameters. And now the question is, can we overload the main method in Java?

The answer is Yes. We can easily overload the main method just like any other method but remember; the JVM will always call the original main method and never the overloaded ones, as shown in the below program.

public class Codekru < public static void main(String[] args) < System.out.println("Original main method"); >public static void main(int args) < System.out.println("Int args overloaded main method"); >public static void main() < System.out.println("No args overloaded method"); >>

Here, we can see JVM calls the original main method.

Then, how can we call the overloaded methods?

We will be able to call the overloaded methods from the original main() method in the same way we do with other methods.

public class Codekru < public static void main(String[] args) < System.out.println("Original main method"); main(1); // calling "int" overloaded method main(); // calling "no-arg" overloaded method >public static void main(int args) < System.out.println("Int args overloaded main method"); >public static void main() < System.out.println("No args overloaded method"); >>

Original main method Int args overloaded main method No args overloaded method

Here, we were able to call the overloaded main() methods from the original main() method.

But we should avoid writing the main() method with the same parameters as the original main() method but with a different return type because that is no method overloading. The number of parameters or type of parameters must be different for overloading.

public class Codekru < public static void main(String[] args) < System.out.println("Original main method"); >// this is not correct // this is giving "Duplicate method name" error public static int main(String args[]) < System.out.println("return type is int"); >>

Can we override the main method in Java?

If a subclass also defines a method present in the superclass. Then we can say that the subclass has overridden the superclass method, which is known as the method overriding . And here, we can only override the instance methods and not the static methods because static methods are bonded with the class instead of the object.

So, can we override the main() method in Java?

No, we cannot override the main() method in Java. This is because Java’s original main() method is marked as static and static methods cannot be overridden. You won’t get an error if you try to override the main() method. But that would be the method hiding and not method overriding.

public class Codekru < public static void main(String[] args) < System.out.println("Original main method"); Subclass subclass = new Subclass(); subclass.main(args); // this is "method hiding" // and not "method overriding" >> class Subclass extends Codekru < public static void main(String[] args) < System.out.println("main method in Subclass"); >>

Original main method main method in Subclass

We hope that you have liked the article. If you have any doubts or concerns, please feel free to write us in the comments or mail us at [email protected].

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Can we override main method in java

, implying this method can be accessed without having an object (because it’s representation never changes), but here the logic is easy understood if you think like the jvm again; «I don’t have any objects to create (instantiate) objects, so I need a static method to start the application as there simple isn’t any logical way to get an instance specific method up yet as I don’t have anything up yet to create objects». In fact all the parts of the main method declaration make perfect sense when you think like the ‘jvm’ and picture what the main method does (starts the application): , because this method must be accessible by the jvm (not written by you).

Override main method

No. main is a static method, and is thus not polymorphic. You may hide it be defining another static main method in a subclass, though.

No and you are losing the focus here. The main method has a single purpose and is declared logically for that sole purpose:

The main method in Java belongs to a class but not to an Object. Objects are created at The main() in Java is the start point in your application, there is no way to start your application from an instance specific method. That is why the static keyword make perfect sense with the main method. In fact all the parts of the main method declaration make perfect sense when you think like the ‘jvm’ and picture what the main method does (starts the application):

• public , because this method must be accessible by the jvm (not written by you).
• static , implying this method can be accessed without having an object (because it’s representation never changes), but here the logic is easy understood if you think like the jvm again; «I don’t have any objects to create (instantiate) objects, so I need a static method to start the application as there simple isn’t any logical way to get an instance specific method up yet as I don’t have anything up yet to create objects».
• void This method can’t logically return anything because there is nothing up yet to return anything to. It is the start point of the application. main I am the main method as without me you won’t have an application.
• String[] args Send me data you may feel useful for my startup.

We can not override the static method because static metod is a class method and the scope of this method within the same class itself. So if you want to override forcefully then you have to define it outside of that class scope which does not make sense.

Can we override private methods in Java, Can we override private methods in Java. Ideally No. But, using the tricky code, a subclass can override a private …

How to use main method in method overriding?

you cant just nest a method definition inside another method like that.

you can do something like:

public class Test < public static void main(String args[]) < Bike obj = new Bike(); obj.run(); >> class Vehicle < void run() < System.out.println("Vehicle is running"); >> class Bike extends Vehicle

and be sure the class you are running to start the application is the test class (the one with the static void main method)

You were correct the first time:

class Vehicle < void run() < System.out.println("Vehicle is running"); >> class Bike extends Vehicle < public static void main(String[] args) < Bike obj = new Bike(); obj.run(); >> 

This does run I have just tested it, this was my output:

Vehicle is running Process finished with exit code 0 

May I suggest that you try doing a «clean & build» before running.

Can we overload the main() method in Java?, What you are trying to do is overloading the main method, not making it polymorphic. And no, you can’t do it (or to be precise: overload you can, just the JVM won’t call the overloaded versions). The JVM is looking for a main method with a specific signature, namely taking a String [] parameter.

How to override main methods for Map

if (Objects.equals(middleString, valueString))  

if (middleString == valueString || (middleString != null && middleString.equals(valueString)) 

public class ThreadTest < public static void main(String[] args) < MyThread t = new MyThread(); t.start(); >> class MyThread extends Thread < @Override public void start() < // overriding the start() method System.out.println("Overriding a start() method"); super.start(); >@Override public void run() < System.out.println("run() method "); >>

Overriding a start() method run() method