java isNumeric, isDigits, isNumber

import org.apache.commons.lang.math.NumberUtils;

import org.apache.commons.lang.StringUtils;

 

// 자연수 + 공백

assertFalse(StringUtils.isNumeric(null));

assertTrue (StringUtils.isNumeric(""));

assertFalse(StringUtils.isNumeric("  "));

assertTrue (StringUtils.isNumeric("0"));

assertTrue (StringUtils.isNumeric("123"));

assertFalse(StringUtils.isNumeric("12 3"));

assertFalse(StringUtils.isNumeric("ab2c"));

assertFalse(StringUtils.isNumeric("12-3"));

assertFalse(StringUtils.isNumeric("12.3"));

assertFalse(StringUtils.isNumeric("-123"));

assertFalse(StringUtils.isNumeric("+123"));

 

// 자연수

assertFalse(NumberUtils.isDigits(null));

assertFalse(NumberUtils.isDigits(""));

assertFalse(NumberUtils.isDigits("  "));

assertTrue (NumberUtils.isDigits("0"));

assertTrue (NumberUtils.isDigits("123"));

assertFalse(NumberUtils.isDigits("12 3"));

assertFalse(NumberUtils.isDigits("ab2c"));

assertFalse(NumberUtils.isDigits("12-3"));

assertFalse(NumberUtils.isDigits("12.3"));

assertFalse(NumberUtils.isDigits("-123"));

assertFalse(NumberUtils.isDigits("+123"));

 

// 정수 + 실수 (+ 앞에 붙으면 안됨)

assertFalse(NumberUtils.isNumber(null));

assertFalse(NumberUtils.isNumber(""));

assertFalse(NumberUtils.isNumber("  "));

assertTrue (NumberUtils.isNumber("0"));

assertTrue (NumberUtils.isNumber("123"));

assertFalse(NumberUtils.isNumber("12 3"));

assertFalse(NumberUtils.isNumber("ab2c"));

assertFalse(NumberUtils.isNumber("12-3"));

assertTrue (NumberUtils.isNumber("12.3"));

assertTrue (NumberUtils.isNumber("-123"));

assertFalse(NumberUtils.isNumber("+123"));