Passing string to wrapper classes

[Badri Sarma]

Hi,


new Float("10.0F"); // there wont be any exception
new Float("10L"); // will raise a run time exception

Why this difference in F & L?

[Keith Lynn]

This is from the API.

public Float(String s)
throws NumberFormatException

Constructs a newly allocated Float object that represents the floating-point value of type float represented by the string. The string is converted to a float value as if by the valueOf method.

valueOf

public static Float valueOf(String s)
throws NumberFormatException

Returns a Float object holding the float value represented by the argument string s.

If s is null, then a NullPointerException is thrown.

Leading and trailing whitespace characters in s are ignored. The rest of s should constitute a FloatValue as described by the lexical syntax rules:

FloatValue:
Signopt NaN
Signopt Infinity
Signopt FloatingPointLiteral

where Sign and FloatingPointLiteral are as defined in �3.10.2 of the Java Language Specification. If s does not have the form of a FloatValue, then a NumberFormatException is thrown.

[Badri Sarma]

Thanks for the information