1.The arguments which are passing from command-prompt are called command-line arguments.
With these command-line arguments, JVM will create an array & by passing that array as arguments
JVM will call main( ) method.
for example:-
class Test
{
public static void main(String [ ] args)
{
System.out.println("javabychetan.blogspot.com ");
for(int i=0;i<args.length;i++)
{
System.out.println(args[i]);
}
}
}
 |
| javabychetan.blogspot.com |
The output of the program is:
javabychetan.blogspot.com
A
B
C
Runtime-Exception ArrayIndexOutOfBoundException
Why Runtime-Exception ??
Because at args[0]=A,args[1]=B,args[2]=c,
But at args[3] is nothing that's why we are getting Runtime-Exception ArrayIndexOutOfBoundException.
Note:-If we replace <= with < then we won't get any Runtime-Exception.
2. The main advantage of command line arguments is we can customize the behavior of the main( ) method.
The String is taken as an argument type because:-
- From String to any other type we can able to convert.
- String is the most commonly used object in java.
example 2:-
class Test
{
public static void main(String [ ] args)
{
String [ ] argh={"A","B","C"};
args=argh;
for(String s:args)
{
System.out.println(s);
}
}
}
Now
javac Test.java
java X Y Z
Output is :-
A
B
C
After
args=argh;
Next:Operators & Assignments
Back:Language Fundamental
class Test
{
public static void main(String [ ] args)
{
String [ ] argh={"A","B","C"};
args=argh;
for(String s:args)
{
System.out.println(s);
}
}
}
Now
javac Test.java
java X Y Z
Output is :-
A
B
C
After
args=argh;
Next:Operators & Assignments
Back:Language Fundamental
