masayoshi.okutsu@Eng 1996-12-20
The lexical convention of Float(String s) is ambiguous to programmers.
Fujitsu reported the following.

Case 1: Float("1.23f")
JDK1.1 : An exception occurs both on PC and Solaris.
JDK1.0.2 : No exception occurs both on PC and Solaris.
Case 2: Float("1.23")
No exception occurs on any combination of JDK1.0.2 , JDK 1.1 , PC
and Solaris.

The spec of JDK 1.1 changed ?

Sample program:

public class floatTest {
public static void main (String args[]) {
try {
Float f2 = new Float("1.23f") ;
} catch (NumberFormatException n) {
System.out.println("exception caught!!") ;
}
}
}


Execution result

jdk102% javac floatTest.java
jdk102% java floatTest

jdk11% javac floatTest.java
jdk11% java floatTest
exception caught!!

It seems that "1.23f" is a wrong notation, but the API spec should clarify
character classes to specify a floating number in String. For example,
does it accept the Thai digits?

The imcompatibility between 1.0.2 and 1.1 is another issue.