Hi

import java.io.*;
import java.io.IOException;

public class UppercaseExam{
public static void main(String[] args) throws IOException{
BufferedReader buff = new BufferedReader(new InputStreamReader(System.in));
System.out.println("Enter the lower string value");
String str = buff.readLine();
char units = str.charAt(0);
units = Character.toUpperCase(units);
System.out.println(units);
}
}


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char units = args[1].charAt(0);

Returns the char value at the specified index.


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read for more information,

http://www.roseindia.net/java/java-conversion/