How to check if the user has entered an integer or a float value using Java?

I realized that Java does not provide any standard library method like isInteger() for the verification.
I came upon two good methods for checking if the user has entered an integer value or float value.
Solution 1:
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String enteredNumber = "6.234";
double d=double.parseInt(enteredNumber);
if (Math.floor(d)==d) {
// d is an integer
}
else
{
// d's not an integer
}
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Solution 2:
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String enteredNumber = "6.234";
try {
int v = Integer.parseInt(enteredNumber);
valid = true;
// it's an integer
} catch(NumberFormatException e) {
valid = false;
//it's not an integer
}
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To get the fractional portion of a number in Java

Problem:How do to get the fractional portion of a number in Java?
Suppose we have a number 4.56.
We need to get 0.56(fractional part) of it.
Solution:
double fraction(double d) {
if (d >= 0)
return d-Math.floor(d);
return d-Math.ceil(d);
}

Thanks to this link:
http://forum.java.sun.com/thread.jspa?threadID=752735&messageID=4301382