Hi friend
Here is the modified one go through this

import java.io.*;
import java.util.*;

class parseString
{
public static void main(String args[]) throws IOException
{
String str = new String();
int digit=0,upper=0,lower=0,other=0;
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
str = br.readLine();
char[] stringArray = str.toCharArray();
System.out.println("String Entered :"+str);
String modified = new String();
String modified1 = new String();
for(int i=0;i<str.length();i++)
{
if(Character.isDigit(stringArray[i]))
digit++;
else if(Character.isLowerCase(stringArray[i]))
{
lower++;
modified1 = modified1 + Character.toUpperCase(stringArray[i]);
}
else if(Character.isUpperCase(stringArray[i]))
{
upper++;
modified = modified + Character.toLowerCase(stringArray[i]);
}
else
other++;

}

System.out.println("Digits :"+digit);
System.out.println("Lowercase letters :"+lower);
System.out.println("UpperCase letters :"+upper);
System.out.println("spaces :"+other);
System.out.println("Modified :"+modified1+""+modified);
}
}

/*
Regards
SVK
*/