Singleton Pattern Used in Java Stand Library

// Singleton Pattern Used in Java Stand Library
class AmericaPresident {
private AmericaPresident() { }

private static AmericaPresident thePresident;

public static AmericaPresident getPresident(){
if(thePresident == null)
thePresident = new AmericaPresident();
return thePresident;
}
}

public class AmericaPresidentTest {
public static void main(String[] args) {
AmericaPresident a  = AmericaPresident.getPresident();

}
}