Java实现从字符串中找出数字字符串的方法小结

int start = 0;String numStr = null;for (int j = 0; j < valuesStr.length() - 1; j++) { if (Character.isDigit(valuesStr.charAt(j)) == false  && Character.isDigit(valuesStr.charAt(j + 1)) == true) {   start = j + 1;  numStr = valuesStr.substring(start, valuesStr.length()); }}

public static boolean isNumeric(String str){ for (int i = str.length();--i>=0;){  if (!Character.isDigit(str.charAt(i))){  return false;  } } return true;}

public static boolean isNumeric(String str){  Pattern pattern = Pattern.compile("[0-9]*");  return pattern.matcher(str).matches();}

public static boolean isNumeric(String str){  for(int i=str.length();--i>=0;){   int chr=str.charAt(i);   if(chr<48 || chr>57)     return false;  }  return true;}