Integer value of strings

Question

How can I convert "1,000" (input obtained as a string) to an integer?

Learn basics of Integer in java: download.oracle.com/javase/6/docs/api/java/lang/… — Harry Joy
– Harry Joy, Commented Mar 29, 2011 at 9:39

Nishan · Accepted Answer · 2011-03-29 09:38:13Z

7

    DecimalFormat df = new DecimalFormat("#,###");
    int i = df.parse("1,000").intValue();
    System.out.println(i);

answered Mar 29, 2011 at 9:38

Nishan

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1 Comment

Sahil Jain Over a year ago

A generic approach colud be like this. Integer.parseInt("1,000".replaceAll("[^\\d.]", ""))

MarcoS · Accepted Answer · 2011-03-29 09:39:44Z

3

Integer i = Integer.valueOf("1,000".replaceAll(",", ""));

answered Mar 29, 2011 at 9:39

MarcoS

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2 Comments

Patrick Ferreira Over a year ago

better : System.out.println(Integer.parseInt("1,000".replaceAll("\\D+", "")));

Jules Over a year ago

@Peter Lawrey: It's programming with a positive attitude ;)

bstack · Accepted Answer · 2011-03-29 09:45:30Z

2

String stringValue = "1,000";

String cleanedStringValue = stringValue.replace(',','');

int intValue = Integer.parseInt(cleanedStringValue);

edited Mar 29, 2011 at 9:45

answered Mar 29, 2011 at 9:38

bstack

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2 Comments

bstack Over a year ago

Becuase for some reason it was not rendering the code properly when the comments were included! Pardon me but Im new to all of this stackoverflow stuff!

Harry Joy Over a year ago

Look at 3rd revision here: stackoverflow.com/posts/5470551/revisions which is made by me. It shows comment and code both well.

user492238 · Accepted Answer · 2011-03-29 09:38:37Z

1

ParseInt:

http://download.oracle.com/javase/1.4.2/docs/api/java/lang/Integer.html#parseInt%28java.lang.String%29

answered Mar 29, 2011 at 9:38

user492238

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1 Comment

Heiko Rupp Over a year ago

Does not work. See documentation "The characters in the string must all be decimal digits, except that the first character may be an ASCII minus sign '-' ('\u002D') to indicate a negative value."

Peeter · Accepted Answer · 2011-03-29 09:39:07Z

1

I'd take a look at this class: http://download.oracle.com/javase/1.4.2/docs/api/java/text/NumberFormat.html

answered Mar 29, 2011 at 9:39

Peeter

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Comments

Saurabh Gokhale · Accepted Answer · 2011-03-29 09:40:11Z

0

String str ="1000";

Try this

 int i = Integer.valueOf("1,000".replaceAll(",", ""));

answered Mar 29, 2011 at 9:40

Saurabh Gokhale

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Comments

topless · Accepted Answer · 2011-03-29 09:40:15Z

0

Integer.parseInt("1000");

Prefer avoiding "magic numbers"

String num = "1000";
Integer.parseInt(num);

answered Mar 29, 2011 at 9:40

topless

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Comments

Ciaran McHale · Accepted Answer · 2011-03-29 09:41:12Z

0

Use code like the following.

String str = "1000";
int result;
try {
    result = Integer.parseInt(str);
} catch(NumberFormatException ex) {
    System.err.println("That was not an integer");
}

answered Mar 29, 2011 at 9:41

Ciaran McHale

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Comments

Sachin Shanbhag · Accepted Answer · 2011-03-29 09:44:07Z

0

Just replace all comma with empty string and then use convert.ToInt32();

string str = "1,000";
int num = Integer.parseInt(str.replace(",",""));

edited Mar 29, 2011 at 9:44

answered Mar 29, 2011 at 9:37

Sachin Shanbhag

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2 Comments

user673218 Over a year ago

I need to perform the conversion in java!

Sachin Shanbhag Over a year ago

@user673218 - This is available in java too ;)

simont · Accepted Answer · 2012-08-14 11:43:06Z

0

with a comma (,) in the the string you probably cannot do it.

edited Aug 14, 2012 at 11:43

simont

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answered Mar 29, 2011 at 9:38

sushil bharwani

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Comments

Robert · Accepted Answer · 2015-05-06 09:42:17Z

0

Always prefer to use Long.ValueOf instead of new Long. Indeed, the new Long always result in a new object whereas Long.ValueOf allows to cache the values by the compiler. Thanks to the cache, you code will be faster to execute.

edited May 6, 2015 at 9:42

Robert

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answered May 6, 2015 at 9:38

Rémi Surget

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1 Comment

greg-449 Over a year ago

This does not provide an answer to the question. To critique or request clarification from an author, leave a comment below their post - you can always comment on your own posts, and once you have sufficient reputation you will be able to comment on any post.

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