<h2 id="heading-by-string-method">By String method</h2>
<pre><code class="lang-java">yourString.replaceAll(<span class="hljs-string">" "</span>, <span class="hljs-string">""</span>);
</code></pre>
<h2 id="heading-by-regular-expression">By regular expression</h2>
<pre><code class="lang-java">yourString.replaceAll(<span class="hljs-string">"\\p{Z}"</span>, <span class="hljs-string">""</span>);
</code></pre>
<h2 id="heading-explanation">Explanation</h2>
<p>Most situations, using the string method will be good enough to delete all spaces in String. However, computers have some charsets that represent spaces such as IDEOGRAPHIC SPACE. In this case, use the regular expression to delete all the spaces.</p>
<h2 id="heading-example">Example</h2>
<pre><code class="lang-java">        String yourString = <span class="hljs-string">" this is\u3000test ru n"</span>;
        System.out.println(yourString);

        String byMethod = yourString.replaceAll(<span class="hljs-string">" "</span>, <span class="hljs-string">""</span>);
        System.out.println(<span class="hljs-string">"byMethod: "</span>+byMethod);

        String byRegularExpression = yourString.replaceAll(<span class="hljs-string">"\\p{Z}"</span>, <span class="hljs-string">""</span>);
        System.out.println(<span class="hljs-string">"byRegularExpression: "</span>+byRegularExpression);
</code></pre>
<h2 id="heading-result">Result</h2>
<pre><code> <span class="hljs-keyword">this</span> <span class="hljs-keyword">is</span>　test ru n <span class="hljs-comment">// original String</span>
thisis　testrun <span class="hljs-comment">// by method</span>
thisistestrun <span class="hljs-comment">// by regular expression</span>
</code></pre>

## By String method
```java
yourString.replaceAll(" ", "");
```
## By regular expression
```java
yourString.replaceAll("\\p{Z}", "");
```

## Explanation
Most situations, using the string method will be good enough to delete all spaces in String. However, computers have some charsets that represent spaces such as IDEOGRAPHIC SPACE. In this case, use the regular expression to delete all the spaces.
## Example
```java
        String yourString = " this is\u3000test ru n";
        System.out.println(yourString);

        String byMethod = yourString.replaceAll(" ", "");
        System.out.println("byMethod: "+byMethod);

        String byRegularExpression = yourString.replaceAll("\\p{Z}", "");
        System.out.println("byRegularExpression: "+byRegularExpression);
```
## Result
```
 this is　test ru n // original String
thisis　testrun // by method
thisistestrun // by regular expression
```

How to Delete all spaces from String in JAVA

By String method

By regular expression

Explanation

Example

Result