One of the mutual incertitude alongside Java beginners acre learning overloading too overriding is, whether it's possible to overload principal inwards Java ? Can you lot override the principal method inwards Java? How volition JVM honour if you lot modify the signature of the principal method equally move of method overloading? etc. These are a expert query too shows curiosity too application of noesis of students, thence if you lot are the tutor you lot must reply these questions. The brusque reply to, can nosotros overload the principal method inwards Java is Yes, you lot tin plow over the sack overloading, zero stops from overloading, but JVM volition ever telephone phone the master copy principal method, it volition never telephone phone your overloaded principal method. nosotros volition larn this inwards picayune to a greater extent than item later, instantly coming to adjacent question, can you lot override the principal method inwards Java? the reply is No because main is a static method too static method cannot endure overridden inwards Java.
In fellowship to reply this query agreement of overloading too overriding is necessary. You should know that overloading takes house at compile fourth dimension too overriding takes house at runtime. You should too endure familiar with rules of method overloading too overriding inwards Java.
Though main() is a exceptional method because its the entry betoken of your Java application, it follows same dominion of method overriding too overloading similar whatever other method. In this article, you lot volition larn how to overload principal method to meet whether JVM calls the original, measure principal with string declaration or not.
In this example, you lot tin plow over the sack meet that nosotros own got 2 principal methods, 1 accepts String array equally declaration too other accepts Integer array equally argument, but you lot tin plow over the sack meet that when you lot run our computer program from ascendence line, exclusively the principal method with string array equally declaration is called.
There was no error, no ambiguity, JVM volition ever telephone phone this principal method, no affair how many overloaded principal method you lot volition set on this class. Then questions comes how do you lot telephone phone your overloaded main? Well, you lot tin plow over the sack telephone phone it exactly similar whatever other method.
Simply calling main(new int[]{1, 2, 3}) from master copy principal method volition invoke your overloaded principal with integer array equally argument. Since at that spot is no compilation error, it proves that you lot tin plow over the sack overload principal method inwards Java.
Regarding Overriding nosotros own got already proven that static method cannot endure overridden, too thence tin plow over the sack exclusively endure hided. See that postal service to larn this concept yesteryear next an example. In short, principal method tin plow over the sack endure overloaded but cannot endure overridden inwards Java.
That's all nigh overloading too overriding principal method inwards Java. Now you lot know that its possible to overload principal inwards Java but its non possible to override it, merely because its a static method. Execution of Java computer program has no affect on overloading principal because JVM ever telephone phone the master copy principal method too if it doesn't flora inwards course of report too thence it throws java.lang.NoSuchMethodError: principal Exception inwards thread "main" fault at runtime.
If you lot similar this tutorial too looking for closed to to a greater extent than Java beginners tutorial, I advise to cheque out next tutorials from this spider web log :
In fellowship to reply this query agreement of overloading too overriding is necessary. You should know that overloading takes house at compile fourth dimension too overriding takes house at runtime. You should too endure familiar with rules of method overloading too overriding inwards Java.
Though main() is a exceptional method because its the entry betoken of your Java application, it follows same dominion of method overriding too overloading similar whatever other method. In this article, you lot volition larn how to overload principal method to meet whether JVM calls the original, measure principal with string declaration or not.
Overloading principal method inwards Java
Here is how you lot tin plow over the sack overload principal method inwards Java. This is exactly 1 way, you lot tin plow over the sack do equally many version of principal equally you lot want, but you lot must brand certain that method signature of each principal is different. You tin plow over the sack modify method signature yesteryear changing type of argument, break of arguments or fellowship of arguments. Best practise to overload a method is yesteryear changing break of arguments, or type of arguments. Overloading methods exactly yesteryear changing fellowship of arguments may do confusion too increase peril of calling incorrect method. Its worth holler upwards that, In Java, its non possible to overload the method yesteryear exactly changing render type.
/** * Java Program to present that you lot tin plow over the sack overload principal method inwards Java * but you lot cannot override principal method. * * @author Javin Paul */ public class Helloworld { /** * Standard principal method, JVM volition exclusively telephone phone this method * fifty-fifty if you lot provided multiple overloaded version. * */ public static void main(String[] args) { System.out.println("Inside main(String[] args) method ...."); } /** * An overloaded principal method which accepts Integer[] instead of * String[] equally argument. * @param args */ public static void main(Integer[] args){ System.out.println("Inside main(Integer[] args) method ...."); } /** * Another overloaded principal method which accepts Double[] instead of * String[] equally argument. * @param args */ public static void main(Double[] args){ System.out.println("Inside main(Double[] args) method ...."); } } Output Inside main(String[] args) method ....
In this example, you lot tin plow over the sack meet that nosotros own got 2 principal methods, 1 accepts String array equally declaration too other accepts Integer array equally argument, but you lot tin plow over the sack meet that when you lot run our computer program from ascendence line, exclusively the principal method with string array equally declaration is called.
There was no error, no ambiguity, JVM volition ever telephone phone this principal method, no affair how many overloaded principal method you lot volition set on this class. Then questions comes how do you lot telephone phone your overloaded main? Well, you lot tin plow over the sack telephone phone it exactly similar whatever other method.
Simply calling main(new int[]{1, 2, 3}) from master copy principal method volition invoke your overloaded principal with integer array equally argument. Since at that spot is no compilation error, it proves that you lot tin plow over the sack overload principal method inwards Java.
Regarding Overriding nosotros own got already proven that static method cannot endure overridden, too thence tin plow over the sack exclusively endure hided. See that postal service to larn this concept yesteryear next an example. In short, principal method tin plow over the sack endure overloaded but cannot endure overridden inwards Java.
That's all nigh overloading too overriding principal method inwards Java. Now you lot know that its possible to overload principal inwards Java but its non possible to override it, merely because its a static method. Execution of Java computer program has no affect on overloading principal because JVM ever telephone phone the master copy principal method too if it doesn't flora inwards course of report too thence it throws java.lang.NoSuchMethodError: principal Exception inwards thread "main" fault at runtime.
If you lot similar this tutorial too looking for closed to to a greater extent than Java beginners tutorial, I advise to cheque out next tutorials from this spider web log :
- Understanding Helloworld Program inwards Java (explanation)
- How to run Java computer program from ascendence prompt? (example)
- 10 things Every Java programmer should know nigh principal method (article)
- How to run Java computer program from JAR file? (example)
- Can you lot run a Java computer program without principal method? (answer)
- How to brand executable JAR inwards Eclipse? (steps)
- What is divergence betwixt PATH too CLASSPATH inwards Java? (answer)
- What is .class file inwards Java? How does it work? (answer)
Recommended Java Books for Beginners
- Head First Java sec Edition yesteryear Kathy Sierra too squad (check here)
- Core Java Volume 1 ninth Edition yesteryear Cay S. Horstmann (check here)
- Java: Influenza A virus subtype H5N1 Beginner's Guide yesteryear Herbert Schildt (check here)
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