大家帮忙分析一下这语句的错误

Question

O,又是花花,没办法,我是初学者,不懂处多多
望指教了:
ReadFromFile.java:9: ')' expected
                while((char ch = (char)System.in.read())!='\n')
                            ^
ReadFromFile.java:35: illegal start of expression
*/      }
        ^
ReadFromFile.java:13: ')' expected
                }
                 ^
ReadFromFile.java:9: incompatible types
found   : char
required: boolean
                while((char ch = (char)System.in.read())!='\n')
                      ^
4 errors

Answer 1

while((char)System.in.read() != '\n')即可

Answer 2

while(!String.valueOf(System.in.read()).equals(""))
??

Answer 3

while(String.valueOf(System.in.read()).length()>0)

Answer 4

应该是String str;
System.in.read(str);