If the conversion attempt fails -- for instance, if you try to convert the Java String fred to an int -- the Integer parseInt method will throw a NumberFormatException, which you should handle in a try/catch block.f the String represented by the variable myString is a valid integer like â1â, â200â, and so on, it will be converted to a Java int. If it fails for any reason, the conversion can throw a NumberFormatException, so your code should be a little bit longer to account for this, as shown in the next example.
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They are assigned to a compound as the CAS registers a new compound. The number has no significance to the chemistry, structure or chemical nature of the molecule. The CAS Number of a compound is a useful way to identify a chemical over its name. For example, the compound CAS 64-17-5 refers to ethanol. Ethanol is also known as ethyl alcohol, ethyl hydrate, absolute alcohol, grain alcohol, hydroxyethane. The CAS number is the same for all these names.