从Java中的字符串中删除字符

Question

I have a String and I need to remove a certain char from it and I have been able to do this, but I still have a problem. I get rid of the char, but the length of the string stays the same.

public class HelloWorld{

   public static void main(String []args){
       String data = "Hello World";
       System.out.println(data);
       System.out.println("string length: " + data.length());
       char letter = 'l';
       data = data.replace(letter, '\0');
       System.out.println(data);
       System.out.println("string length: " + data.length());
    }
 }

This gives me the output:

Hello World

string length: 11

Heo Word

string length: 11

I need it to be:

Hello World

string length: 11

Heo Word

string length: 8

Why does it seem to be counting chars that are no longer in the string?

Answer 1

This replace is not right:

 data = data.replace(letter, '\\0'); 

Java doesn't treat null characters specially. Instead, use:

data = data.replace(String.valueOf(letter), "");

This is because there are two overloads, neither of which is replace(char, CharSequence) . We therefore use the replace(CharSequence, CharSequence) overload (as Strings are CharSequence s)

If you're OK with redefining letter to be a String, you can simply do:

data = data.replace(letter, "");

Answer 2

You did not remove chars, just replace them.

Try this:

String letter = "l";
data = data.replace(letter, "");