user.xml

<templateSet group="user">
  <template name="sing" value="private static $className$ instance;&#10;&#10;private $className$() {}&#10;&#10;public static $className$ getInstance() {&#10;    if (instance == null) {&#10;        synchronized ($className$.class) {&#10;            if (instance == null) {&#10;                instance = new $className$();&#10;            }&#10;        }&#10;    }&#10;    return instance;&#10;}" description="Creates a Singleton pattern" toReformat="false" toShortenFQNames="true">
    <variable name="className" expression="className()" defaultValue="" alwaysStopAt="true" />
    <context>
      <option name="JAVA_DECLARATION" value="true" />
    </context>
  </template>
  <template name="const" value="private $className$() {&#10;    throw new AssertionError();&#10;}&#10;" description="Creates a Constants class' constructor" toReformat="false" toShortenFQNames="true">
    <variable name="className" expression="className()" defaultValue="" alwaysStopAt="true" />
    <context>
      <option name="JAVA_DECLARATION" value="true" />
    </context>
  </template>
</templateSet>