Get all digits from a string in Java

Let’s say the following is our string.

String str = "DEMO98 TE4567XT";

To display only the digits from the above string, we have used the replaceAll() method and replace all the characters with empty.

str.replaceAll("\D", ""))

The following is the final example that displays only digits from the string.

Example

<span class="kwd">public</span><span class="pln"> </span><span class="kwd">class</span><span class="pln"> </span><span class="typ">Demo</span><span class="pln"> </span><span class="pun">{</span>
<span class="kwd">   public</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> main</span><span class="pun">(</span><span class="typ">String</span><span class="pun">[]</span><span class="pln"> args</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span>
<span class="typ">      String</span><span class="pln"> str </span><span class="pun">=</span><span class="pln"> </span><span class="str">"DEMO98 TE4567XT"</span><span class="pun">;</span>
<span class="typ">      System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"String = "</span><span class="pun">+</span><span class="pln">str</span><span class="pun">);</span>
<span class="typ">      System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"Displaying digits: "</span><span class="pun">+</span><span class="pln">str</span><span class="pun">.</span><span class="pln">replaceAll</span><span class="pun">(</span><span class="str">"\D"</span><span class="pun">,</span><span class="pln"> </span><span class="str">""</span><span class="pun">));</span>
<span class="pun"> }</span>
<span class="pun">}</span>

Output

String = DEMO98 TE4567XT
Displaying digits: 984567