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Editorial Team
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Asked: 2026-06-04T19:38:34+00:00

StringUtils.isNumeric returns true for and false for 7.8. This is of course it’s documented

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StringUtils.isNumeric returns true for “” and false for 7.8. This is of course it’s documented behavior, but really not the most convenient for me. Is there something else (ideally in commons.lang) that provides an isActuallyNumeric?

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1 Answer

  1. Editorial Team

    Try isNumber(String) from org.apache.commons.lang.math.NumberUtils.

    Checks whether the String [is] a valid Java number.

    Valid numbers include hexadecimal marked with the 0x qualifier,
    scientific notation and numbers marked with a type qualifier (e.g.
    123L).

    Null and empty String will return false.

    UPDATE –

    isNumber(String) is now deprecated. Use isCreatable(String) instead.

    Thank you eav for pointing it out.

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