Can you please help me with this simple (not for me:) issue

Question

Why this doesnt work?
public void spl ()
     String a=("moon.sun");
String [] f=a.split(".");
System.out.println(f[0]);
}

Answer 1

The second expression to split() is a regular expression. A period in a regular expression matches all characters, and you're wanting it to just match a period.
To match just the period for your split, you'll need to escape it:String[] f = a.split("\\.");