用java编写程序，输入一个单词，输出时使单词的第一个字母大写

正确程序代码如下：
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.StringTokenizer;
public class TTTest {
public static void main(String args[]) {
try {
BufferedReader in = new BufferedReader(new InputStreamReader(
System.in));
String s = in.readLine();
StringBuffer s1 = new StringBuffer();
StringTokenizer st = new StringTokenizer(s);

while (st.hasMoreTokens()) {
String str = st.nextToken();

char c = (str).charAt(0);
if (c >= 'a' && c <= 'z') {
c = (char) ((int) c - 32);
s1.append(c);
} else
s1.append(c);

for (int i = 1; i < (str).length(); i++) {
char c1 = (str).charAt(i);
s1.append(c1);
}

s1.append(" ");

}

System.out.print(" " + s1.toString());
} catch (IOException e) {
System.out.println(e);
}
}<