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import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
public class AllCapsDemo {
public static void main(String[] arguments) {
String sourceName = "asdf";
try {
File source = new File(sourceName);
File temp = new File("cap" + sourceName + ".tmp");
FileReader fr = new FileReader(source);
BufferedReader in = new BufferedReader(fr);
FileWriter fw = new FileWriter(temp);
BufferedWriter out = new BufferedWriter(fw);
boolean eof = false;
int inChar = 0;
do {
inChar = in.read();
if (inChar != -1) {
char outChar = Character.toUpperCase((char) inChar);
out.write(outChar);
} else
eof = true;
} while (!eof);
in.close();
out.close();
boolean deleted = source.delete();
if (deleted)
temp.renameTo(source);
} catch (Exception se) {
System.out.println("Error - " + se.toString());
}
}
}
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