How can I check if a value is of type Integer

Question

I need to check if a value is an integer  I found this  How to check whether input value is integer or float   but if I m not mistaken  the variable there is still of type double even though the value itself is indeed an integer

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You should use the instanceof operator to determine if your value is Integer or not   Object object   your value   if object instanceof Integer     Integer integer    Integer  object      else      your value isn t integer

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Here is the function for to check is String is Integer or not    public static boolean isStringInteger String number        try          Integer parseInt number        catch Exception e            return false            return true

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To check if a String contains digit character which represent an integer  you can use Integer parseInt     To check if a double contains a value which can be an integer  you can use Math floor   or Math ceil

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This can work   int no 0  try       no Integer parseInt string       if string contains                     if string contains  f                          System out println  float                      else             System out println  double             catch Exception ex        Console WriteLine  not numeric or string

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Try maybe this way  try      double d  Double valueOf someString       if  d   int d           System out println  integer   int d        else          System out println  double  d          catch Exception e       System out println  not number        But all numbers outside Integers range  like  -1231231231231231238   will be treated as doubles  If you want to get rid of that problem you can try it this way  try       double d   Double valueOf someString       if  someString matches    -   d       optional minus and at least one digit         System out println  integer    d         else           System out println  double    d           catch  Exception e        System out println  not number

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If input value can be in  numeric form other than integer   check by  if  x     int x          Number is integer     If string value is being passed   use Integer parseInt string var   Please ensure error handling using try catch in case conversion fails

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this is the shortest way I know with negative integers enabled   Object myObject    -1    if Pattern matches    -   d     CharSequence  myObject     true        System out println  It s an integer         And this is the way with negative integers disabled   Object myObject    1    if Pattern matches    d     CharSequence  myObject     true        System out println  It s an integer

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If you have a double float floating point number and want to see if it s an integer   public boolean isDoubleInt double d          select a  tolerance range  for being an integer     double TOLERANCE   1E-5        do not use  int d  due to weird floating point conversions      return Math abs Math floor d  - d   lt  TOLERANCE      If you have a string and want to see if it s an integer  Preferably  don t throw out the Integer valueOf   result   public boolean isStringInt String s        try               Integer parseInt s           return true        catch  NumberFormatException ex                return false            If you want to see if something is an Integer object  and hence wraps an int    public boolean isObjectInteger Object o        return o instanceof Integer

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if  x   1    0         x is an integer   Here x is a numeric primitive  short  int  long  float or double

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You can use modulus    the solution is so simple   import java text DecimalFormat  import java util Scanner  public class Main       public static void main String   args         Scanner scan   new Scanner System in       System out println  Enter first number        Double m   scan nextDouble        System out println  Enter second number        Double n  scan nextDouble         if m n  0                 System out println  Integer              else               System out println  Double

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Try this snippet of code  private static boolean isStringInt String s       Scanner in new Scanner s       return in hasNextInt

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You need to first check if it s a number  If so you can use the Math Round method  If the result and the original value are equal then it s an integer

[java] How can I check if a value is of type Integer?

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