Can an application have multiple classes having main method?

Q

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A

Yes it is possible. While starting the application we mention the class name to be run. The JVM will look for the Main method only in the class whose name you have mentioned. Hence there is not conflict amongst the multiple classes having main method.

2013-05-08, 2168👍, 0💬

What if I do not provide the String array as the argument to the method?
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If I do not provide any arguments on the command line, then the String array of Main method will be empty or null?
If I do not provide any arguments on the command line, then the String array of Main method will be empty or null? It is empty. But not null. 2013-05-06, 2840👍, 0💬

What environment variables do I need to set on my machine in order to be able to run Java programs?
What environment variables do I need to set on my machine in order to be able to run Java programs? CLASSPATH and PATH are the two variables. 2013-05-07, 2221👍, 0💬

Can I import same package/class twice? Will the JVM load the package twice at runtime?
Can I import same package/class twice? Will the JVM load the package twice at runtime? One can import the same package or same class multiple times. Neither compiler nor JVM complains abt it. And the JVM will internally load the class only once no matter how many times you import the same class. 2013-05-09, 2196👍, 0💬

How can one prove that the array is not null but empty using one line of code?
How can one prove that the array is not null but empty using one line of code? Print args.length. It will print 0. That means it is empty. But if it would have been null then it would have thrown a NullPointerException on attempting to print args.length. 2013-05-07, 2188👍, 0💬

Can I have multiple main methods in the same class?
Can I have multiple main methods in the same class? No the program fails to compile. The compiler says that the main method is already defined in the class. 2013-05-08, 2177👍, 0💬

Can an application have multiple classes having main method?
Can an application have multiple classes having main method? Yes it is possible. While starting the application we mention the class name to be run. The JVM will look for the Main method only in the class whose name you have mentioned. Hence there is not conflict amongst the multiple classes having ... 2013-05-08, 2169👍, 0💬

What are Checked and UnChecked Exception?
What are Checked and UnChecked Exception? A checked exception is some subclass of Exception (or Exception itself), excluding class RuntimeException and its subclasses. Making an exception checked forces client programmers to deal with the possibility that the exception will be thrown. eg, IOExceptio... 2013-05-10, 2157👍, 0💬

Do I need to import java.lang package any time? Why ?
Do I need to import java.lang package any time? Why ? No. It is by default loaded internally by the JVM. 2013-05-09, 2128👍, 0💬

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