doubt in switch case satatement

public class SwitchCase
{
public static void main(String[] args)
{
int a=12;
switch(a){
case 014:
System.out.print("I know java");
break;
case 12:
System.out.print("I don't know java");
default:
System.out.print("I also know c++");
}
}
}  

how does it work , can you please explain?