读取键盘输入的字母，并转换成大写输出在控制台上
import java.io.BufferedInputStream;import java.io.BufferedOutputStream;import java.io.BufferedReader;import java.io.BufferedWriter;import java.io.FileInputStream;import java.io.IOException;import java.io.InputStream;import java.io.InputStreamReader;import java.io.OutputStreamWriter;public class SystemInput {//读取键盘录入的字母，并将所有字母转换成大写字母输出在控制台上public static void main(String[] args) {// SystemInDemo1();}private static void SystemInDemo1() {// 读取一个键盘录入的数据并打印在控制台上BufferedReader bis = null;BufferedWriter bos = null;bis = new BufferedReader(new InputStreamReader(System.in));bos = new BufferedWriter(new OutputStreamWriter(System.out));String len = null;try {while((len=bis.readLine())!=null){String s = len.toUpperCase();bos.write(s);bos.newLine();bos.flush();}} catch (IOException e) {e.printStackTrace();}finally{try {bis.close();} catch (IOException e) {e.printStackTrace();}try {bos.close();} catch (IOException e) {e.printStackTrace();}}}}
运行程序
