CODEWITHSUNDEEP
javastring
user516883
user516883

Reputation: 9408

Removing characters in a java string

I want to remove charecters from a string. Example: I have an application that as the users check off the check mark its building the sql script, so if they check female it adds to the String And Gender = 'Female'. and if they select Male it adds And Where gender = 'Male'. The script is working well when adding to string as they check off but when you uncheck a item I am not sure how to remove the char that were added when it was checked. I tried .Replace .ReplaceAll and all the other replace. I know the string I want to remove, why won't it replace it with "".

String SQL; 
SQL += " AND Gender = 'Female'";  
SQL.Replace("AND Gender = 'Female'","");

This won't work!

Upvotes: 1

Views: 776

Answers (4)

user467871
user467871

Reputation:

String is immutable class. Here is another solution : convert to StringBuffer or StringBuilder and delete from the startIndex to endIndex 

String s = "test tes te t ";
String str = new StringBuffer(s).delete(start, end).toString();

for example :
String str = new StringBuffer(s).delete(0, 8).toString();
System.out.println(str); // s te t

Upvotes: 1

The Scrum Meister
The Scrum Meister

Reputation: 30141

SQL = SQL.replace("AND Gender = 'Female'","");

strings are immutable in java

Upvotes: 7

Hovercraft Full Of Eels
Hovercraft Full Of Eels

Reputation: 285460

Don't use a String if you want something mutable. Instead you're better off using a StringBuilder object. Then when you're done modifying it, you can call toString() on it to get the String you need. The API will show you the methods of this flexible class.

Upvotes: 1

Matthew Purland
Matthew Purland

Reputation: 290

A java string (java.lang.String) is immutable; it cannot be edited. You can try using StringBuffer (java.lang.StringBuffer) which is a mutable buffer for returning strings.

StringBuffer SQL = new StringBuffer();
SQL.append(" AND Gender = 'Female'");

You can also use replace and delete to remove substrings from the buffer. When you're done editing the buffer simply use SQL.toString().

Upvotes: 1

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