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java判断字符串是否是数字的步骤

分类: IT文章 • 2024-03-05 13:26:10
java判断字符串是否是数字的方法
  1. package com.sap.cesp.creditinsight.web.app.util;
  3. import java.util.regex.Matcher;
  4. import java.util.regex.Pattern;
  6. publicclass NumberValidationUtils {
  8. privatestaticboolean isMatch(String regex, String orginal){
  9. if (orginal == null || orginal.trim().equals("")) {
  10. returnfalse;
  11. }
  12. Pattern pattern = Pattern.compile(regex);
  13. Matcher isNum = pattern.matcher(orginal);
  14. return isNum.matches();
  15. }
  17. publicstaticboolean isPositiveInteger(String orginal) {
  18. return isMatch("^\\+{0,1}[1-9]\\d*", orginal);
  19. }
  21. publicstaticboolean isNegativeInteger(String orginal) {
  22. return isMatch("^-[1-9]\\d*", orginal);
  23. }
  25. publicstaticboolean isWholeNumber(String orginal) {
  26. return isMatch("[+-]{0,1}0", orginal) || isPositiveInteger(orginal) || isNegativeInteger(orginal);
  27. }
  29. publicstaticboolean isPositiveDecimal(String orginal){
  30. return isMatch("\\+{0,1}[0]\\.[1-9]*|\\+{0,1}[1-9]\\d*\\.\\d*", orginal);
  31. }
  33. publicstaticboolean isNegativeDecimal(String orginal){
  34. return isMatch("^-[0]\\.[1-9]*|^-[1-9]\\d*\\.\\d*", orginal);
  35. }
  37. publicstaticboolean isDecimal(String orginal){
  38. return isMatch("[-+]{0,1}\\d+\\.\\d*|[-+]{0,1}\\d*\\.\\d+", orginal);
  39. }
  41. publicstaticboolean isRealNumber(String orginal){
  42. return isWholeNumber(orginal) || isDecimal(orginal);
  43. }
  45. }
  46. 转：http://blog.****.net/z69183787/article/details/12848685

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