Скажите где ошибка в компиляции.​

Class OftenChar{
 public static void main(String args[]){
  java.util.Scanner in = new java.util.Scanner(System.in);
  String string = in.nextLine(); char chars[] = new char[4];
  chars[0] = in.nextLine().charAt(0); chars[2] = in.nextLine().charAt(0);
  for(int sChar = 0; sChar<string.length(); sChar++)
   if(string.charAt(sChar)==chars[0])chars[1]++;
   else if(string.charAt(sChar)==chars[2])chars[3]++;
  System.out.print("\n"+(chars[1]==chars[3]?chars[0]+""+chars[2]:chars[1]>chars[3]?chars[0]:chars[2]));
 }
}

While:

Program TaskA;
Var i: Integer;
Begini := 1;
While i < 1024 Do
Begin
i := i * 2;
Write(i, ' ');
End;
End.

Program TaskB;
Var i, a: Integer;
Begin
i := 1;
While i < 21 Do
Begin
a := a + i;
i := i + 1;
Write(a, ' ');
End;
End.

Program TaskC;
Var i, sum: Integer;
Begin
While sum < 100 Do
Begini := i + 1;
sum := sum + i;
Write(i, ' ');
End;
End.

Random:

Program TaskA;
Begin
Randomize;
WriteLn(Random);
End.

Program TaskB;
Begin
Randomize;
WriteLn(Random(10) + 1);
End.

Program TaskC;
Begin
Randomize;
WriteLn(Random(20 + 1) - 10);
End.

Program TaskD;
Begin
Randomize;
WriteLn(Random(51) * 2);
End.

Program TaskE;
Begin
Randomize;
WriteLn(Random(50) * 2 + 1);
End.