Can someone help me?!

Question

With the input abcfbc abfcab it is supposed to give me 4(exludes the redudant characters) but it gives 9
import java.util.Scanner;

public class Main {

public static void main(String[] args) {
// TODO Auto-generated method stub
int max=1000;
System.out.println("enter a string");
Scanner sc=new Scanner(System.in);
String string1=sc.nextLine();
if(string1.length()>max)
string1=string1.substring(0,max);
String []string2=string1.split(" ",2);
String sequence1=string2[0];
String sequence2=string2[1];
String sequence3="";
int sum=0;
char [] red=new char[1];
for(int i=0;i<sequence1.length();i++)
{
for(int j=0;j<sequence2.length();j++) {
red[0]=sequence2.charAt(j);
if(sequence1.charAt(i)==red[0]&&sequence3.contains(red.toString())==false)
sequence3=sequence3+red[0];
}
}
System.out.println(sequence3.length());
}

}

Answer 1

Michal that's amazing , thank you ! I'll take your code as an example and try to make it shorter

Answer 2

Xerxès no problem and good luck :)

Answer 3

I refactored your code just a little bit.
Extra, my proposition
https://code.sololearn.com/cqrK50WamPvL/?ref=app