JAVA-录入操作例子

class SystemInputDemo
{
 public static void main(String[] args) throws Exception
 {
  readInByArray();
  readInByBuffer();
 }

 //掌握S他ringBuffer这种方法，进行IO操作使用.
 public static void readInByBuffer() throws Exception
 {
  StringBuffer sb = new StringBuffer();
  while (true)
  {
   int ch = System.in.read();
   if (ch == '\r')
    continue;
   else if (ch == '\n')
   {
    String s = sb.toString();
    if (s.equalsIgnoreCase("over"))
    {
     break;
    }
    System.out.println(s.toUpperCase());
    sb.delete(0, sb.length());
   }
   else
    sb.append((char)ch);
  }
 }

 public static void readInByArray() throws Exception
 {
  byte [] b = new byte[1024];
  int pos = 0;
  while(true)
  {
   int by = System.in.read();
   switch (by)
   {
    case '\r' :
     break;
    case '\n' :
     String s = new String(b, 0, pos);
     if (s.equalsIgnoreCase("over"))
      return;     
     System.out.println(s.toUpperCase());
     pos = 0;
     break;
    default :
     b[pos++] = (byte)by;
   }

  }
 }
}