Java Programming - Language Fundamentals - Discussion

@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.

Hi Friends,

The array index always starts with '0' that means args[0].

C\:>java CommandArgs 1 2 3 4

The arguments variable 'args' will hold the elements as given below.

args[0] = 1
args[1] = 2
args[2] = 3
args[3] = 4

But in the program we are trying to get the element at 4th index.

String s4 = args[4]; // due to this line an exception is thrown.

I hope that you are all understand this. Have a nice day!

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.

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.

package mypack;

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

Why this one throwing the arrayoutofbound exception?

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);
}
}

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

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.

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".

What should be the correct program with correct command line arguments? Anyone please tell me.

I tried changes in program but it dosent work.