Is there any method or quick way to check whether a number is an Integer (belongs to Z field) in Java?
I thought of maybe subtracting it from the rounded number, but I didn't find any method that will help me with this.
Where should I check? Integer Api?
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.
The Number. isInteger() method returns true if a value is an integer of the datatype Number. Otherwise it returns false .
Quick and dirty...
if (x == (int)x) { ... }
edit: This is assuming x is already in some other numeric form. If you're dealing with strings, look into Integer.parseInt
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