how to remove a part of a string

Question

Given two strings, base and remove, return a version of the base string where all instances of the remove string have been removed (not case sensitive). You may assume that the remove string is of length 1 or more. Remove only non-overlapping instances, so with "xxx" removing "xx" leaves "x".

withoutString("Hello there", "llo") → "He there"
withoutString("Hello there", "e") → "Hllo thr"
withoutString("Hello there", "x") → "Hello there"

Why can't I use this code:

public String withoutString(String base, String remove)
{
    base.replace(remove, "");
    return base;
}

I didn't get, why people up voting this question.. :P

Deepak Sharma
– Deepak Sharma

2014-12-04 12:37:50 +00:00
Commented Dec 4, 2014 at 12:37 — Deepak Sharma
– Deepak Sharma, Commented Dec 4, 2014 at 12:37

Eran · Accepted Answer · 2014-12-04 12:35:46Z

8

base.replace doesn't change the original String instance, since String is an immutable class. Therefore, you must return the output of replace, which is a new String.

      public String withoutString(String base, String remove) 
      {
          return base.replace(remove,"");
      }

answered Dec 4, 2014 at 12:35

Eran

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Comments

Predrag Maric · Accepted Answer · 2014-12-04 12:35:57Z

4

String#replace() returns a new string, doesn't change the one it is invoked on, since strings are immutable. Use this in your code:

base = base.replace(remove, "")

answered Dec 4, 2014 at 12:35

Predrag Maric

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Comments

user2575725 · Accepted Answer · 2014-12-04 12:36:40Z

0

Update your code:

public String withoutString(String base, String remove) {
   //base.replace(remove,"");//<-- base is not updated, instead a new string is builded
   return base.replace(remove,"");
}

answered Dec 4, 2014 at 12:36

user2575725

Comments

Darshan Lila · Accepted Answer · 2014-12-04 12:55:38Z

0

Try following code

public String withoutString(String base, String remove) {
          return base.replace(remove,"");
      }

For Input :

base=Hello World   
remove=llo

Output :

He World

For more on such string operations visit this link.

answered Dec 4, 2014 at 12:55

Darshan Lila

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Comments

dogankadriye · Accepted Answer · 2014-12-05 13:27:05Z

0

Apache Commons library has already implemented this method,you don't need to write again.

Code :

 return StringUtils.remove(base, remove);

edited Dec 5, 2014 at 13:27

answered Dec 4, 2014 at 14:03

dogankadriye

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