Java Programming - Language Fundamentals - Discussion

class CommandArgs
{
public static void main(String [] args)
{
String s1 = args[1];
String s2 = args[2];
String s3 = args[3];
//String s4 = args[4];
System.out.print(" args[2] = " + s2);
}
}


now also runtime excption

@Baldev.

The above program also gives run time exception since the array index starts with 0 so, declare/initialize the string s1=args[0];

class CommandArgs
{
public static void main(String [] args)
{
String s1 = args[0];
String s2 = args[1];
String s3 = args[2];
//String s4 = args[3];
System.out.print(" args[2] = " + s2);
}
}

Compile and run the program while you run the program give the values there itself like java CommandArgs 10 20 30

You will get the output successfully.

@nikhila : Thanks for ur explanation abt Baldevs query .... even me too had the same doubt!

@Nikhila.

I tried your code in eclipse but still getting array out of boundary exception.

args[1]=0(1)
args[2]=0,1(1,2)
args[3]=0,1,2(1,2,3)
args[4]=0,1,2,3(1,2,3,4)

String s2=args[2]

args[2]=0,1,2

Command Args are 1 2 3 4

Result is "ArrayIndexOutOfBoundsException".

class test{
public static void main(String [] args)
{
String s1 = args[0];
String s2 = args[1];
String s3 = args[2];
String s4 = args[3];
System.out.print(" args[2] = " + s2);
}
}

OUTPUT: Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 0 is shown. Any one help me.

public class CommandArgs
{
public static void main(String [] args)
{
String s1 = args[0];
String s2 = args[1];
String s3 = args[2];
String s4 = args[3];
System.out.print(" args[2] = " + s2);
}
}
Save it as CommandArgs.java

Compile it and run the program as follows,
"java CommandArgs 1 2 3 4" and you will get output as args[2] = 2.

It's take 4 is size becoz we have entered 4 args so, array starts it's memory allocation from the 0th element.

from cmd pmt we entered 1 2 3 4.

args[0]=1;
args[1]=2;
args[2]=3;
args[3]=4;
args[4]=? we are not allocated any value to this one but in the array it will shows empty.

Still not getting correct answers please guys guide me. It show oly out of bound array.

public class CommandArgs
{
public static void main(String [] args)
{
String s1 = args[0];
String s2 = args[1];
String s3 = args[2];
String s4 = args[3];
System.out.print(" args[2] = " + s2);
}
}

@Balaji and @Vivek.

You should give arguments as shown below;
java CommandArgs 1 2 3 4