10 lines
342 B
Java
10 lines
342 B
Java
private static final boolean isNumeric(final String s) {
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if (s == null || s.isEmpty()) return false;
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for (int x = 0; x < s.length(); x++) {
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final char c = s.charAt(x);
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if (x == 0 && (c == '-')) continue; // negative
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if ((c >= '0') && (c <= '9')) continue; // 0 - 9
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return false; // invalid
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}
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return true; // valid
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}
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