splitting string and replacing

[itsme]

Hi
I am new to JAVA .I am trying to write a code where I have a string which contains several lines.The end character of each line is \n .i want to replace \n with \r\n for my purpose.I need to chk whether each line end with \r\n --if it does do nothing or else replace \n with \r\n.
Below is teh small code i have written but its not working for me .Can any body help?
my string name is is swift

int length =swift.length();
for (int i = 0; i<=length; i++)
int value1 = swift.indexOf("\n");
System.out.println (" value1 is " + value1 );
int value2 = value1 -1;
System.out.println (" value2 is " + value2 );

char mg = swift.charAt(value2);
char pg =swift.charAt (value1);

System.out.println ("Its here now before conversion ");
if ( mg == '\r' )
{ //do nothing
System.out.println (" cntr M is there ");
}
else
{

System.out.println (" Swift message is " + swift );
System.out.println (" Its not there " );
swift.replace("\n","\r\n");
System.out.println (" cntr M was not there and conversion done ");

}

}

[itsme]

I now changed the logic.I am now taking each line in an array and checking
whether it contains \r ( do nothing if there)or replace (\n with \r\n).
Everything seems fine except the last replaecement .Can any body help .

int count=0;int index=0;
char seperator ='\n';
do
{
++ count;++ index;

index = swift.indexOf(seperator,index);
System.out.println (" index is " + index );
}
while(index!= -1);
System.out.println (" count is " + count );

//Extract string into array

String[] Substr = new String[count];
index = 0;int endIndex=0;
for (int i=0;i< count; i++)
{
endIndex=swift.indexOf(seperator,index);
if(endIndex==-1)
Substr[i]=swift.substring(index);
else
{
Substr[i]=swift.substring(index,endIndex);
}

if (Substr[i].contains("\r"))
{
System.out.println("No need of conversion");
System.out.println("Substring" + i + "is" + Substr[i]);
}
else
{
Substr[i].replace("\n","\r\n");
System.out.println("conversion done");
System.out.println("Substring" + i + "is" + Substr[i]);
}

index=endIndex+1;
}
//Display
for (int i=0;i<Substr.length;i++)
System.out.println("Substring" + i + "is" + Substr[i]);