Replacing string

[sankar dunga]

Dear sir,

How can we replace old string with new string characters from right side , i mean
.....................
If the oldstrring=00000000
and newstring=1100

i want the output as 00001100.
................................
please give me if any functions are available to do this.

Thank you

regards
sankar

[Mahi Ranga]

Hi,

you can use String.format("%08d",Integer.parseInt(newstring));

[Darryl Burke]

Insufficient information. What result do you want if the old String is "00000011"?

please give me if any functions are available to do this.

Java has methods, not functions.

[Vinoth Kumar Kannan]

If you want to do a find & replace from the right of a String, then what you can do is -

reverse your input string

reverse your pattern

do a normal replaceFirst or whatever

reverse back the replaced string

The above is just a workaround to your problem. I doubt there is a method in java that'd help you do this.

[Campbell Ritchie]

Have you tried a StringBuilder? That sound like what it is designed for.

[Mahi Ranga]

Hi,
you can use like this.
String oldstrring="00000000";
String newstring="1100";
String append=oldstrring+newstring;
String strFormat=String.format("%08d",Integer.parseInt(append));
System.out.println(strFormat);

[Campbell Ritchie]

If you simply want to prepend 0s to a String, you can use a loop to append however many 0s to an empty StringBuilder, and append the string you want.

[jishnu dasgupta]

You may also substring the original string and then append the replacement string to it.That i think would be the simplest and mayb the most naive...

[Alexander Sales]

tmpString = oldstring.substring(0,oldstring.length() - newstring.length());
newerString = tmpString + newString;

[Alexander Sales]

according to jishnu's idea.