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


java—IO流——读取键盘输入的字母并转换成大写字母输出在控制台上_数据