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- public boolean isNumber(String s) {
- s = s.trim();
- boolean pointSeen = false;
- boolean eSeen = false;
- boolean numberSeen = false;
- boolean numberAfterE = true;
- for(int i=0; i<s.length(); i++) {
- if('0' <= s.charAt(i) && s.charAt(i) <= '9') {
- numberSeen = true;
- numberAfterE = true;
- } else if(s.charAt(i) == '.') {
- if(eSeen || pointSeen) {
- return false;
- }
- pointSeen = true;
- } else if(s.charAt(i) == 'e') {
- if(eSeen || !numberSeen) {
- return false;
- }
- numberAfterE = false;
- eSeen = true;
- } else if(s.charAt(i) == '-' || s.charAt(i) == '+') {
- if(i != 0 && s.charAt(i-1) != 'e') {
- return false;
- }
- } else {
- return false;
- }
- }
- return numberSeen && numberAfterE;
- }
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