Using substring( ) in Java

You can extract a substring using substring( ). It has two forms. The first is String substring(int startIndex)

Here, startIndex specifies the index at which the substring will begin. This form returns a copy of the substring that begins at startIndex and runs to the end of the invoking string.

The second form of substring( ) allows you to specify both the beginning and ending index of the substring:

String substring(int startIndex,
int endIndex)

Here, startIndex specifies the beginning index, and endIndex specifies the stopping point. The string returned contains all the characters from the beginning index, up to, but not including, the ending index. The following program uses substring( ) to replace all instances of one substring with another within a string:


  // Substring replacement.

class StringReplace {

public static void main(String args[]) {

String org = "This is a test. This is, too.";

String search = "is";

String sub = "was";

String result = "";

int i;

do { // replace all matching substrings

System.out.println(org);

i = org.indexOf(search);

if(i != -1) {

result = org.substring(0, i);

result = result + sub;

result = result + org.substring(i + search.length());

org = result;

}

} while(i != -1);

}

}

The output from this program is shown here:

This is a test. This is, too.

Thwas is a test. This is, too.

Thwas was a test. This is, too.

Thwas was a test. Thwas is, too.

Thwas was a test. Thwas was, too.

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Archived Comments

1. Hi puru, The syntax is substring(int startIndex, i
View Tutorial By: Fazal at 2008-09-12 20:17:53

2. I need to know the parameters that we need to pass
View Tutorial By: puru at 2008-09-08 00:33:46

3. The example program by itself doesn't solve any pu
View Tutorial By: Fazal at 2008-03-17 21:23:10

4. Where is the methods related
View Tutorial By: Osvaldo F. L. Mendes at 2008-03-17 15:40:48

5. voire pluse a des command java
View Tutorial By: lahcine moubarek at 2009-02-16 01:59:17

6. thanks you.
View Tutorial By: seo at 2009-04-19 03:27:46

7. Could you somehow use the substring method to pars
View Tutorial By: Eric at 2009-04-26 19:20:26

8. @Eric

You would have to know the lo
View Tutorial By: Guy at 2010-09-27 17:18:31

9. I think the programmer overlooked that "this
View Tutorial By: Joe Schmoe at 2010-10-16 00:01:27

10. RegEx would be a good option here...
[^A-Z
View Tutorial By: Ima Retard at 2010-11-26 05:49:32

11. thanks for this sample.. it possible to handle the
View Tutorial By: nel at 2011-06-13 22:59:45

12. can you help me in codings for get an output like
View Tutorial By: Sudhar at 2011-08-24 05:47:53

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thi
View Tutorial By: Ridge Fernandes at 2012-01-19 04:09:45

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View Tutorial By: obieramkar at 2012-01-25 09:25:42

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View Tutorial By: Fadnereippend at 2012-02-13 12:43:51

16. can some one tell how to dry run above example
View Tutorial By: neha at 2012-03-24 05:43:49

17. can someone explain above example in detail
View Tutorial By: neha at 2012-03-24 05:57:34

18. org.replaceAll("is","was"); en
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class CharaaDemofromnet
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