Summary of Java implementation method to find numeric strings from strings

This article summarizes the Java implementation method to find numeric strings from strings. Share it for your reference, as follows:

 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()); }}

There are three ways to reprint from other places:

1. Use the functions that come with JAVA

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

2. Use regular expressions

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

3. Use ascii code

 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;}

I hope this article will be helpful to everyone's Java programming.