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Added checkNumeric String #7

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Added checkNumeric String #7

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14 changes: 14 additions & 0 deletions strings/checkNumeric.java
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Original file line number Diff line number Diff line change
@@ -0,0 +1,14 @@
public class checkNumeric{
private static final boolean isNumeric(final String s) {
if (s == null || s.isEmpty()) return false;
int x = 0;
while(x < s.length()){
final char c = s.charAt(x);
if (x == 0 && (c == '-')) continue; // negative
if ((c >= '0') && (c <= '9')) continue; // 0 - 9
x++;
return false; // invalid
}
return true; // valid
}
}