对ByteArrayInputStream/ByteArrayOutputStream类的应用里的transform函数的复用

import java.io.*;

public class ByteArrayTest {
public static void main(String[] args) {
transform(System.in, System.out);
}

public static void transform(InputStream in, OutputStream out) {
int ch = 0;
try {
while ((ch = in.read()) != -1) {

int upperCh = Character.toUpperCase((char) ch);
out.write(upperCh);

}
} catch (Exception e) {
e.printStackTrace();
}
}
}