Need help with reading a file

Question

Hello, I'm trying to read this file, but I keep getting a java.nullpointerexception at the end of it:
Element: PART
Content: (HEADER,CHAPTER+)
Element: p
Content: (#PCDATA)
Element: INTRODUCTION
Content: (HEADER,p+)+
Element: CHAPTER_NUMBER
Content: (#PCDATA)
Element: HEADER
Content: (#PCDATA)
Element: BOOK
Content: (OPENER,SUBTITLE?,INTRODUCTION?,(SECTION|PART)+)
Element: SECTION
Content: (HEADER,p+)
Element: CHAPTER
Content: (CHAPTER_NUMBER,CHAPTER_TEXT)
Element: OPENER
Content: (TITLE_TEXT)*
Element: CHAPTER_TEXT
Content: (p)+
Element: SUBTITLE
Content: (#PCDATA)
Element: TITLE_TEXT
Content: (#PCDATA)
here is my code:
                       s = br.readLine();
                        while (s != null){
                                node[i] = new Node();
                                if (s.startsWith("Element: ")){
                                   node.element = s.substring(s.indexOf(":") + 2);
System.out.println("Element[" + i + "]: " + node[i].element);
else if (s.startsWith(" Content: ")){  
node[i].content = s.substring(s.indexOf(":") + 2);
System.out.println("Content[" + i + "]: " + node[i].content);
s = br.readLine();
if (s.startsWith("Element: ")) i++; //line 194 causes error
br.close();
here is my output
Element[0]: PART
Content[0]: (HEADER,CHAPTER+)
Element[1]: p
Content[1]: (#PCDATA)
Element[2]: INTRODUCTION
Content[2]: (HEADER,p+)+
Element[3]: CHAPTER_NUMBER
Content[3]: (#PCDATA)
Element[4]: HEADER
Content[4]: (#PCDATA)
Element[5]: BOOK
Content[5]: (OPENER,SUBTITLE?,INTRODUCTION?,(SECTION|PART)+)
Element[6]: SECTION
Content[6]: (HEADER,p+)
Element[7]: CHAPTER
Content[7]: (CHAPTER_NUMBER,CHAPTER_TEXT)
Element[8]: OPENER
Content[8]: (TITLE_TEXT)*
Element[9]: CHAPTER_TEXT
Content[9]: (p)+
Element[10]: SUBTITLE
Content[10]: (#PCDATA)
Element[11]: TITLE_TEXT
Content[11]: (#PCDATA)
java.lang.NullPointerException
at Test.readDTDObjectFile(Test.java:194)
at Test.<init>(Test.java:143)
at Test.main(Test.java:338)
can anybody help me figure out how to fix this? thanks so much!

Answer 1

nevermind, i figured it out. thanks anyway!