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    <p>Nice question. I've got of the following <strike>five</strike> 6 methods to do it.</p> <pre><code>1. String stringValueOf = String.valueOf('c'); // most efficient 2. String stringValueOfCharArray = String.valueOf(new char[]{x}); 3. String characterToString = Character.toString('c'); 4. String characterObjectToString = new Character('c').toString(); // Although this method seems very simple, // this is less efficient because the concatenation // expands to new StringBuilder().append(x).append("").toString(); 5. String concatBlankString = 'c' + ""; 6. String fromCharArray = new String(new char[]{x}); </code></pre> <blockquote> <p>Note: <a href="http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/lang/Character.java#Character.toString%28char%29" rel="noreferrer">Character.toString(char)</a> returns <a href="http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/6-b14/java/lang/String.java#String.valueOf%28char%29" rel="noreferrer">String.valueOf(char)</a>. So effectively both are same.</p> </blockquote> <p><code>String.valueOf(char[] value)</code> invokes <code>new String(char[] value)</code>, which in turn sets the <code>value</code> char array.</p> <pre><code>public String(char value[]) { this.value = Arrays.copyOf(value, value.length); } </code></pre> <p>On the other hand <code>String.valueOf(char value)</code> invokes the following <strong>package private constructor.</strong></p> <pre><code>String(char[] value, boolean share) { // assert share : "unshared not supported"; this.value = value; } </code></pre> <p><em>Source code from <code>String.java</code> in <a href="http://grepcode.com/file/repository.grepcode.com/java/root/jdk/openjdk/8u40-b25/java/lang/String.java" rel="noreferrer">Java 8 source code</a></em></p> <blockquote> <p>Hence <code>String.valueOf(char)</code> seems to be most efficient method, in terms of both memory and speed, for converting <code>char</code> to <code>String</code>.</p> </blockquote> <ol> <li><a href="https://deepumohan.com/tech/java-how-to-convert-primitive-char-to/" rel="noreferrer">How to convert primitive char to String in Java</a></li> <li><a href="http://javarevisited.blogspot.in/2012/02/how-to-convert-char-to-string-in-java.html" rel="noreferrer">How to convert Char to String in Java with Example</a></li> </ol>
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