package com.doumee.core.utils;
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import java.util.regex.Pattern;
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/**
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* Java正则校验密码至少包含：字母数字特殊符号中的2种
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*/
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import java.math.BigDecimal;
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import java.util.regex.Pattern;
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public class ScientificNotationTUtil {
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private static final Pattern SCIENTIFIC_NOTATION_PATTERN =
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Pattern.compile("[+-]?\\d*(\\.\\d+)?[eE][+-]?\\d+");
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public static boolean isScientificNotation(String value) {
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return SCIENTIFIC_NOTATION_PATTERN.matcher(value).matches();
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}
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public static double convertScientificNotationToDouble(String scientificNotation) {
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if (isScientificNotation(scientificNotation)) {
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return (Double.parseDouble(scientificNotation));
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} else {
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throw new IllegalArgumentException("The string is not in scientific notation.");
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}
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}
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public static String convertToString(String numberStr) {
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try {
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// 尝试直接将字符串转换为BigDecimal
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return new BigDecimal(numberStr)+"";
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} catch (NumberFormatException e) {
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// 如果转换失败，则尝试解析科学计数法
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String[] parts = numberStr.split("E");
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if (parts.length == 2) {
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// 这是科学计数法，需要转换
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BigDecimal number = new BigDecimal(parts[0]);
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int exponent = Integer.parseInt(parts[1]);
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return number.scaleByPowerOfTen(exponent)+"";
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}
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}
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return numberStr;
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}
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public static BigDecimal convertScientificNotationToBigDecimal(String scientificNotation) {
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if (isScientificNotation(scientificNotation)) {
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return new BigDecimal(scientificNotation);
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} else {
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throw new IllegalArgumentException("The string is not in scientific notation.");
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}
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}
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public static void main(String[] args) {
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// String scientificNotation = "1.23e+3";
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// String scientificNotation = "1.5345690888E10";
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String scientificNotation = "15345690888";
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System.out.println("Is scientific notation: " + isScientificNotation(scientificNotation));
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System.out.println("Converted to String: " + convertToString(scientificNotation));
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// System.out.println("Converted to BigDecimal: " + convertScientificNotationToBigDecimal(scientificNotation));
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}
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}
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