main method and Commandline args

Main() method:
public static void main(String arg[])
If you are keeping main method in any class at Run time we will get no such method error:main
Example:
class Sample { }

• If we run the above program we will get No such method error:main
• If you are changing to static to non static or void to some other return type main to any other name,we will get a RTE saying no such method error:main
• Public and static we can inter change the order .
• We can declare the main method a s final or synchronized.No compile time or run time error .But we can’t declare it as abstract.
• In java ,the default value of Boolean is FALSE (in c and c++ it is true).
• If we want we can over ride (method hiding) the main method.
  

Command line arguments:
example:
class Sample {
public static void main(String arg[]) {
System.out.println(arg[0]); //100
System.out.println(arg[1]); //101
System.out.println(arg.length); //number of command args
}
}
>java Sample 100, 101

• if we are accessing unspecified commandline arguments we will get a RTE saying array index out of bound exception.
• In java commandline arguments are string form.if we want we can change.

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