The first lecture note given during java class is “In java file name and class name should be the same”. When the above law is violated a compiler error message will appear as below
javac Trial.java Trial.java:9: error: class Geeks is public, should be declared in a file named Geeks.java public class Geeks ^ 1 error
But the myth can be violated in such a way to compile the above file.
Step 1: javac Trial.java
Step1 will create a Geeks.class (byte code) without any error message since the class is not public.
Step 2: java Geeks
Now the output will be Hello world
The myth about the file name and class name should be same only when the class is declared in
Now this .class file can be executed. By the above features some more miracles can be done. It is possible to have many classes in a java file. For debugging purposes this approach can be used. Each class can be executed separately to test their functionalities(only on one condition: Inheritance concept should not be used).
But in general it is good to follow the myth.
When the above file is compiled as javac Trial.java will create two .class files as ForGeeks.class and GeeksTest.class .
Since each class has separate main() stub they can be tested individually.
When java ForGeeks is executed the output is For Geeks class.
When java GeeksTest is executed the output is Geeks Test class.
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