Replace a char in a string with another string?

Question

I have a string. I want to replace a character in this string, with another string. How do I do that please ?

For example i have aaaaa i want to replace the first 'a' with "bbbb"

for(i=0; i<aString.length()-1; i++){
    if(aString.charAt(i)...some condition)
        charAt(i) replace with some other string
}

Thats what im trying to do

If you want to replace a char with string, better use concatenation. — driftking9987
– driftking9987, Commented Jan 13, 2019 at 13:20

ZhaoGang · Accepted Answer · 2019-01-13 14:07:03Z

4

For your specific problem( replacing the first 'a'):

public String replaceFirst(String regex, String replacement)

Replaces the first substring of this string that matches the given regular expression with the given replacement.

That is:

String s="aaaaa";
String res=s.replaceFirst("a","bbbb");

For a general solution:

public StringBuilder replace(int start, int end, String str)

Parameters:
start - The beginning index, inclusive.

end - The ending index, exclusive.

str - String that will replace previous contents.

That is:

String s="aaaaa";
StringBuilder sb=new StringBuilder(s);
String res=sb.replace(0,1,"bbbb").toString();

edited Jan 13, 2019 at 14:07

answered Jan 13, 2019 at 13:24

ZhaoGang

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