福建省人防监理培训:很简单的java程序，却错了

import java.io.*;
public class app21
{
public static void main(String args[]) throws IOException
{

FileWriter fw=new FileWriter("c:\\go.txt");
char data[]={'h','e','l','l','o','','j','a','v','a','\r','\n'};
String str=("end of file");
fw.write(data);
fw.write(str);
fw.close();
}
}

书上的一个程序，怎么说错了：
C:\java proc\app21.java:8: empty character literal
char data[]={'h','e','l','l','o','','j','a','v','a','\r','\n'};
^
C:\java proc\app21.java:8: illegal character: \92
char data[]={'h','e','l','l','o','','j','a','v','a','\r','\n'};
^
C:\java proc\app21.java:8: illegal character: \92
char data[]={'h','e','l','l','o','','j','a','v','a','\r','\n'};
^
C:\java proc\app21.java:8: unclosed character literal
char data[]={'h','e','l','l','o','','j','a','v','a','\r','\n'};
^
C:\java proc\app21.java:8: '}' expected
char data[]={'h','e','l','l','o','','j','a','v','a','\r','\n'};
^
5 errors

处理已完成。

--------------------------------------------------------------------------------
为什么要像一楼那样改？