How to represent empty char in Java Character class

Question

I want to represent an empty character in Java as \"\" in String...

Like that char ch = an empty character;

Actually I want to rep

Answer 1

Use the \b operator (the backspace escape operator) in the second parameter

String test= "Anna Banana";

System.out.println(test); //returns Anna Banana<br><br>
System.out.println(test.replaceAll(" ","\b")); //returns AnnaBanana removing all the spaces in the string

Answer 2

Hey i always make methods for custom stuff that is usually not implemented in java. Here is a simple method i made for removing character from String Fast

    public static String removeChar(String str, char c){
        StringBuilder strNew=new StringBuilder(str.length());
        char charRead;
        for(int i=0;i<str.length();i++){
            charRead=str.charAt(i);
            if(charRead!=c)
                strNew.append(charRead);
        }
        return strNew.toString();
    }

For explaintion, yes there is no null character for replacing, but you can remove character like this. I know its a old question, but i am posting this answer because this code may be helpful for some persons.

Answer 3

You may assign '\u0000' (or 0). For this purpose, use Character.MIN_VALUE.

Character ch = Character.MIN_VALUE;

Answer 4

You can do something like this:

mystring.replace(""+ch, "");

Answer 5

In java there is nothing as empty character literal, in other words, '' has no meaning unlike "" which means a empty String literal

The closest you can go about representing empty character literal is through zero length char[], something like:

char[] cArr = {};         // cArr is a zero length array
char[] cArr = new char[0] // this does the same

If you refer to String class its default constructor creates a empty character sequence using new char[0]

Also, using Character.MIN_VALUE is not correct because it is not really empty character rather smallest value of type character.

I also don't like Character c = null; as a solution mainly because jvm will throw NPE if it tries to un-box it. Secondly, null is basically a reference to nothing w.r.t reference type and here we are dealing with primitive type which don't accept null as a possible value.

Assuming that in the string, say str, OP wants to replace all occurrences of a character, say 'x', with empty character '', then try using:

str.replace("x", "");

Answer 6

String before = EMPTY_SPACE+TAB+"word"+TAB+EMPTY_SPACE

Where EMPTY_SPACE = " " (this is String) TAB = '\t' (this is Character)

String after = before.replaceAll(" ", "").replace('\t', '\0') means after = "word"