How to check given string only have numbers using java?

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How to check given string only have numbers using java?
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1 Answer

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By Using Regular Expression:

  • Get the String.
  • Create a Regular Expression to check string contains only digits as mentioned here: regex = "[0-9]+";
  • Match the given string with Regular Expression
  • Return true if the string matches with the given regular expression, else return false.
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