String, text, numbers, I/O I part

String a = "" +

                    " " +

                    " 
this is html.
" +

                    " " +

                    "";

 I am doing some servlet programming and I need to include a few " in a string.

How can I do this?

Answer: By using the escape character \ like so:

String s = "\"";

 I cannot find the method to convert a binary number to an int. I used

Integer.toBinaryString to get a decimal to binary but I don t know how to to convert it

back.

Answer: Try using Integer.parseInt(String s, int radix) with radix = 2

that should do your job.

 How do I launch a native Document by its Associated MIME Type? For example,

I would like to ask the  operating system  what application is associated with .DOC

and then launch it.

Answer: On WinNt,

String docName = "c:\\someyourdir\\nameofdoc.doc";

Runtime.getRuntime().exec("cmd.exe /c "+docName);

 Q: How do I indicate Unicode characters that cannot be represented in ASCII,

such as o?

Answer: from "Java Tutorial

(http://java.sun.com/docs/books/tutorial/i18n/text/convertintro.html) 

"To indicate Unicode characters that cannot be represented in ASCII, such as o, we

used the \uXXXX escape sequence. Each X in the escape sequence is a

hexadecimal digit. The following example shows how to indicate the o character with

an escape sequence: 

String str = "\u00F6";

char c =  \u00F6 ;

Character letter = new Character ( \u00F6 ); "

 When I tried to read one string representing boolean value and convert it into

boolean it didn t work. Finally I found that Java API has a bug!

I wrote the program that uses redaing ini file settings for initialization. All settings in a

file are strings. I am converting them to appropriate type during reading. When I tried

to read one string representing boolean value and convert it into boolean it didn t

work. Finally I found that Java API has a bag:

boolean x = true;

getBoolean(x);

will show false!!!!

Why Java has method that doesn t work? Is it bug in Java or I am stupid? 

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