import java.io.*;
class ReadIn
{
public static void main(String[] args) throws IOException
{
InputStream in = System.in;
StringBuilder sb = new StringBuilder(); while(true)
{
int ch = in.read();
if(ch=='\r')
continue;
if(ch=='\n')
{
String s = sb.toString();
if("over".equals(s))
break;
System.out.println(s.toUpperCase());
sb.delete(0,sb.length();
}
else
sb.append((char)ch); }
}
}
16至20行改为:
System.out.println(sb.toString());
if ("over".equals(sb.toString()));
break;
sb.delete(0,sb.length());
就会无法编译,会提示“Readin.java:18: 无法访问的语句
sb.delete(0,sb.length());”
这是为什么?
难道会和“break”语句有关,
为什么没改之前,break后跟语句会编译通过;改之后,break后跟语句就不能编译通过?
class ReadIn
{
public static void main(String[] args) throws IOException
{
InputStream in = System.in;
StringBuilder sb = new StringBuilder(); while(true)
{
int ch = in.read();
if(ch=='\r')
continue;
if(ch=='\n')
{
String s = sb.toString();
if("over".equals(s))
break;
System.out.println(s.toUpperCase());
sb.delete(0,sb.length();
}
else
sb.append((char)ch); }
}
}
16至20行改为:
System.out.println(sb.toString());
if ("over".equals(sb.toString()));
break;
sb.delete(0,sb.length());
就会无法编译,会提示“Readin.java:18: 无法访问的语句
sb.delete(0,sb.length());”
这是为什么?
难道会和“break”语句有关,
为什么没改之前,break后跟语句会编译通过;改之后,break后跟语句就不能编译通过?
public class ReadIn
{
public static void main(String[] args) throws IOException
{
InputStream in = System.in;
StringBuilder sb = new StringBuilder();
while(true)
{
int ch = in.read();
if(ch=='\r')
continue;
if(ch=='\n')
{
/* String s = sb.toString();
if("over".equals(s))
break;
System.out.println(s.toUpperCase());
sb.delete(0,sb.length();*/
System.out.println(sb.toString());
if ("over".equals(sb.toString())) //if是一个条件,要进行判断,加“;”直接//就over了
break;
sb.delete(0,sb.length());
}
else
sb.append((char)ch);
}
}
}