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justme
Lv 7
justme asked in Computers & InternetProgramming & Design · 7 years ago

Java: String and using the split function?

OK, Im trying to split a string containing an IP Address into the 4 byte address.

Here is my code:

getIP(String st){ //st contains "192.168.1.21"

String[] var = st.split(".");

...

After the split, var has a length of 0. WHY???

If I change it to:

String[] var = st.split("1");

...

I get what I would expect with var having a length of 4 and each string containing:

var[0] = ""

var[1] = "92."

var[2] = "68."

var[3] = ".2"

Can you not use the dot (.) character to split a string???

3 Answers

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  • larrybud2004
    Lv 6
    7 years ago
    Favorite Answer

    Split works fine, but it's expecting a regular expression. Since the "." in RegEx is a special character, you have to escape it.

    BUT since "\" has a special meaning in a string, you have to escape it TOO SO

    String[] var = st.split("\\.");

  • Anonymous
    5 years ago

    Split Function In Java

    Source(s): https://shrink.im/bagDG
  • Sadsongs
    Lv 7
    7 years ago

    I've never used split (it's a while since I wrote any Java) but as it takes a regexp, you'd have to escape the . I would say.

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