How to replace string in java

Question

I have the following code

String rplaceString="John = Max and Jing => Sira then nothing";
String replaced=rplaceString.replace("=", "==").replace("=>", "=>");
System.out.println("REPLACE STRINF==>>>>>>>>"+replaced);

Expected Output String Like this:

String expectedString="John == Max and Jing => Sira then nothing";

If I do above method, Output Looks Like:

REPLACE STRINF==>>>>>>>>John == Max and Jing ==> Sira then nothing

So, How can replace above string in expected string.

Edit: Change String Like this: John =Max and Jing => Sira then nothing

or

John= Max and Jing =>Sira then nothing

or

John=Max and Jing => Sira then nothing

yo don't see, expected output: John == Max and Jing => Sira then nothing — java new user
– java new user, Commented May 30, 2014 at 4:29
@javanewuser Remove all the unrelated junk (that is not part of the expected/actual result) and align the output on top of each-other, and draw focus to the particular issue. In doing so you'll probably find out what the problem is. — user2864740
– user2864740, Commented May 30, 2014 at 4:30
You could use replaceFirst() the docs for String methods are here: docs.oracle.com/javase/6/docs/api/java/lang/String.html — Matt Coubrough
– Matt Coubrough, Commented May 30, 2014 at 4:30

Bryan · Accepted Answer · 2014-06-11 05:24:28Z

7

A simple way to fix the issue would be to just add spaces around the = in your replace:

String replaced=rplaceString.replace(" = ", " == ")

Then you would only be matching the standalone = instead of the arrow as well.

EDIT:

6 Comments

Bryan Over a year ago

awesome! great to hear. If you could just accept this answer I would greatly appreciate it.

java new user Over a year ago

wait bryan, stackoverflow takes some times for accept answers.

Bryan Over a year ago

My bad. shouldn't get so antsy :D

java new user Over a year ago

Bryan, if some change string like this: John =Max and Jing => Sira then nothing ,How to do?

Bryan Over a year ago

So let me get this straight, John =Max and Jing=> Sira then nothing is the string you want to convert into the expected output John == Max and Jing => Sira then nothing

|

Rakesh Patel · Accepted Answer · 2014-05-30 04:41:19Z

0

String rplaceString = "John = Max and Jing => Sira then nothing";
    System.out.println(rplaceString.replaceAll(" = ", " == ").replaceAll("=>", "=>"));

answered May 30, 2014 at 4:41

Rakesh Patel

3832 silver badges10 bronze badges

Comments

MrLore · Accepted Answer · 2014-05-30 05:07:39Z

0

If a space is always guaranteed after the = sign then you can use

String replaced=rplaceString.replace("= ", "== ").replace("=>", "=>");

Please note that I am appending a space after the '=' sign as '= ' while replacing.

edited May 30, 2014 at 5:07

MrLore

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answered May 30, 2014 at 4:35

Yasin

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