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How to check if a string contains only digits 

Jodd is an open-source java library with lot of reusable components and feature rich utilities. This requires the library jodd-3.3.2.jar to be in classpath. The following example shows how to verify whether the given string contains only digits using StringUtil.containsOnlyDigits() API.

File Name  :  
com/bethecoder/tutorials/jodd/utils/StringContainsOnlyDigitsTest.java 
Author  :  Sudhakar KV
Email  :  kvenkatasudhakar@gmail.com
   
package com.bethecoder.tutorials.jodd.utils;

import jodd.util.StringUtil;

public class StringContainsOnlyDigitsTest {

  /**
   @param args
   */
  public static void main(String[] args) {
    System.out.println(StringUtil.containsOnlyDigits("  "));
    System.out.println(StringUtil.containsOnlyDigits("123456"));
    System.out.println(StringUtil.containsOnlyDigits("   786  "));
    System.out.println(StringUtil.containsOnlyDigits("ABCD"));
    System.out.println(StringUtil.containsOnlyDigits("1234"));
  }

}
   

It gives the following output,
false
true
false
false
true


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