How can I Extract Digits from a String in Java?

Extracting Digits from Strings in Java

In Java, extracting digits from a string can be achieved using various methods. One common approach involves utilizing regular expressions to identify and remove non-digit characters.

Method:

1. Start with a Java string containing both digits and non-digits.
2. Use the replaceAll() method to search for all non-digit characters in the string using the regular expression "\D ".
3. Replace the non-digits with an empty string, effectively removing them from the string.

Example:

<code class="java">String str = "123-456-789";
str = str.replaceAll("\D+", "");
System.out.println(str); // Output: 123456789</code>

Note:

This method does not require the installation of any additional libraries as it uses built-in Java features.

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